June 2006 Rev 2 1/34
34
VIPer20A-E
SMPS primary I.C.
General features
Adjustable switching frequency up to 200 kHz
Current mode control
Soft start and shutdown control
Automatic burst mode operation in stand-by
condition able to meet “blue angel” norm (<1w
total power consumption)
Internally trimmed zener reference
Undervoltage lock-out with hysteresis
Integrated start-up supply
Over-temperature protection
Low stand-by current
Adjustable current limitation
Description
All the devices are made using VIPower M0
Technology, combines on the same silicon chip a
state-of-the-art PWM circuit together with an
optimized, high voltage, Vertical Power MOSFET
(700V/ 0.5A).
Typical applications cover offline power supplies
with a secondary power capability of 10W in wide
range condition and 20W in single range or with
doubler configuration. It is compatible from both
primary or secondary regulation loop despite
using around 50% less components when
compared with a discrete solution. Burst mode
operation is an additional feature of this device,
offering the ability to operate in stand-by mode
without extra components.
Type VDSS InRDS(on)
VIPer20A-E
VIPer20ASP-E
VIPer20ADIP-E
700V
700V
700V
0.5A
0.5A
0.5A
18
18
18
PENTAWATT HV
PENTAWATT HV (022Y)
DIP-8
1
10
POWERSO-10TM
www.st.com
Block diagram
VDD
OSC
COMP
DRAIN
SOURCE
13 V
UVLO
LOGIC
SECURITY
LATCH
PWM
LATCH
FFFF
R/S
S
Q
S
R1
R2 R3
Q
OSCILLATOR
OVERTEMP.
DETECTOR
ERROR
AMPLIFIER
_
+
0.5 V +
_
1.7
µs
delay
250 ns
Blanking
CURRENT
AMPLIFIER
ON/OFF
0.5V
6 V/A
_
+
+
_
4.5 V
FC00491
Contents VIPer20A-E
2/34
Contents
1 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Drain pin (Integrated Power MOSFET drain): . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Source pin: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 VDD pin (power supply): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.4 Compensation pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.5 OSC pin (oscillator frequency): . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4 Typical circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5 Operation description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.1 Current mode topology: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Stand-by mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5.3 High voltage start-up current suorce . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 Transconductance error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5.5 External clock synchronization: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.6 Primary peak current limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.7 Over-temperature protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.8 Operation pictures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
VIPer20A-E Contents
3/34
6 Electrical over stress . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.1 Electrical over stress ruggedness . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
7 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
7.1 Layout considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9 Order code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
10 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Electrical data VIPer20A-E
4/34
1 Electrical data
1.1 Maximum rating
Table 1. Absolute maximum rating
Symbol Parameter Value Unit
VDS Continuous Drain-Source Voltage (TJ = 25 to 125°C) –0.3 to 700 V
IDMaximum Current Internally limited A
VDD Supply Voltage 0 to 15 V
VOSC Voltage Range Input 0 to VDD V
VCOMP Voltage Range Input 0 to 5 V
ICOMP Maximum Continuous Current ±2mA
VESD Electrostatic Discharge (R = 1.5k; C = 100pF) 4000 V
ID(AR)
Avalanche Drain-Source Current, Repetitive or Not Repetitive
(TC = 100°C; Pulse width limited by TJ max; δ < 1%) 0.4 A
PTOT Power Dissipation at TC= 25ºC57 W
TJJunction Operating Temperature Internally limited °C
TSTG Storage Temperature -65 to 150 °C
VIPer20A-E Electrical data
5/34
1.2 Electrical characteristics
TJ = 25°C; VDD = 13V, unless otherwise specified
Table 2. Power section
(1) On Inductive Load, Clamped.
Table 3. Supply section
Table 4. Oscillator section
Symbol Parameter Test conditions Min Typ Max Unit
BVDS Drain-Source Voltage ID = 1mA; VCOMP = 0V 700 V
IDSS Off-State Drain
Current
VCOMP = 0V; Tj = 125°C
VDS = 700V 1.0 mA
RDS(on)
Static Drain-Source
On Resistance
ID = 0.4A
ID = 0.4A; TJ= 100°C
15.5 18
32
tfFall Time ID = 0.2A; VIN =300V (1) Figure 7 100 ns
tr Rise Time ID = 0.4A; VIN = 300V (1) Figure 7 50 ns
Coss Output Capacitance VDS = 25V 90 pF
Symbol Parameter Test conditions Min Typ Max Unit
IDDch
Start-Up Charging Current VDD = 5V; VDS = 35V
Figure 6, Figure 11 -2 mA
IDD0
Operating Supply Current VDD = 12V; FSW = 0kHz
Figure 6 12 16 mA
IDD1 Operating Supply Current VDD = 12V; Fsw = 100kHz 13 mA
IDD2 Operating Supply Current VDD = 12V; Fsw = 200kHz 14 mA
VDDoff Undervoltage Shutdown Figure 6 7.5 8 9 V
VDDon Undervoltage Reset Figure 6 11 12 V
VDDhyst Hysteresis Start-up Figure 6 2.4 3 V
Symbol Parameter Test conditions Min Typ Max Unit
FSW Oscillator Frequency Total
Variation
RT=8.2K; CT=2.4nF
VDD=9 to 15V;
with RT± 1%; CT± 5%
(see Figure )(see Figure 14)
90 100 110 KHz
VOSCIH Oscillator Peak Voltage 7.1 V
VOSCIL Oscillator Valley Voltage 3.7 V
Electrical data VIPer20A-E
6/34
Table 5. Error amplifier section
Table 6. PWM comparator section
Table 7. Shutdown and overtemperature section
Symbol Parameter Test conditions Min Typ Max Unit
VDDREG VDD Regulation Point ICOMP=0mA (see Figure 5) 12.6 13 13.4 V
VDDreg Total Variation TJ = 0 to 100°C 2%
GBW Unity Gain Bandwidth
From Input =VDD to
Output = VCOMP
COMP pin is open
Figure 15
150 KHz
AVOL Open Loop Voltage Gain COMP pin is open
Figure 15 45 52 dB
GmDC Transconductance VCOMP=2.5V(see Figure 5) 1.1 1.5 1.9 mA/V
VCOMPLO Output Low Level ICOMP=-400µA; VDD=14V 0.2 V
VCOMPHI Output High Level ICOMP=400µA; VDD=12V 4.5 V
ICOMPLO Output Low Current Capability VCOMP=2.5V; VDD=14V -600 µA
ICOMPHI Output High Current
Capability VCOMP=2.5V; VDD=12V 600 µA
Symbol Parameter Test conditions Min Typ Max Unit
HID VCOMP / IDPEAK VCOMP = 1 to 3 V 4.267.8V/A
VCOMPoff VCOMP Offset IDPEAK = 10mA 0.5 V
IDpeak Peak Current Limitation VDD = 12V; COMP pin open 0.50.670.9 A
tdCurrent Sense Delay to Turn-
Off ID = 1A 250 ns
tbBlanking Time 250 360 ns
ton(min) Minimum On Time 350 1200 ns
Symbol Parameter Test conditions Min Typ Max Unit
VCOMPth Restart Threshold (see Figure 8) 0.5 V
tDISsu Disable Set Up Time (see Figure 8) 1.7 5 µs
Ttsd Thermal Shutdown
Temperature (see Figure 8) 140 170 190 °C
Thyst Thermal Shutdown Hysteresis (see Figure 8) 40 °C
VIPer20A-E Thermal data
7/34
2 Thermal data
Table 8. Thermal data
Symbol Parameter PENTAWATT PowerSO-10™(1)
1. When mounted using the minimum recommended pad size on FR-4 board.
DIP-8 Unit
RthJA Thermal Resistance Junction-pin Max 20 °C/W
RthJC Thermal Resistance Junction-case Max 2.0 2.0 °C/W
RthJC Thermal Resistance Ambient-case Max 70 60 35 (2)
2. On multylayer PCB.
°C/W
Pin description VIPer20A-E
8/34
3 Pin description
3.1 Drain pin (Integrated Power MOSFET drain):
Integrated Power MOSFET drain pin. It provides internal bias current during start-up via an
integrated high voltage current source which is switched off during normal operation. The
device is able to handle an unclamped current during its normal operation, assuring self
protection against voltage surges, PCB stray inductance, and allowing a snubberless operation
for low output power.
3.2 Source pin:
Power MOSFET source pin. Primary side circuit common ground connection.
3.3 VDD pin (power supply):
This pin provides two functions :
It corresponds to the low voltage supply of the control part of the circuit. If VDD goes below
8V, the start-up current source is activated and the output power MOSFET is switched off
until the VDD voltage reaches 11V. During this phase, the internal current consumption is
reduced, the VDD pin is sourcing a current of about 2mA and the COMP pin is shorted to
ground. After that, the current source is shut down, and the device tries to start up by
switching again.
This pin is also connected to the error amplifier, in order to allow primary as well as
secondary regulation configurations. In case of primary regulation, an internal 13V
trimmed reference voltage is used to maintain VDD at 13V. For secondary regulation, a
voltage between 8.5V and 12.5V will be put on VDD pin by transformer design, in order to
stuck the output of the transconductance amplifier to the high state. The COMP pin
behaves as a constant current source, and can easily be connected to the output of an
optocoupler. Note that any overvoltage due to regulation loop failure is still detected by the
error amplifier through the VDD voltage, which cannot overpass 13V. The output voltage
will be somewhat higher than the nominal one, but still under control.
3.4 Compensation pin
This pin provides two functions :
It is the output of the error transconductance amplifier, and allows for the connection of a
compensation network to provide the desired transfer function of the regulation loop. Its
bandwidth can be easily adjusted to the needed value with usual components value. As
stated above, secondary regulation configurations are also implemented through the
COMP pin.
When the COMP voltage is going below 0.5V, the shut-down of the circuit occurs, with a
zero duty cycle for the power MOSFET. This feature can be used to switch off the
converter, and is automatically activated by the regulation loop (no matter what the
configuration is) to provide a burst mode operation in case of negligible output power or
open load condition.
VIPer20A-E Pin description
9/34
3.5 OSC pin (oscillator frequency):
An Rt-Ct network must be connected on that to define the switching frequency. Note that
despite the connection of Rt to VDD, no significant frequency change occurs for VDD varying
from 8V to 15V. It provides also a synchronisation capability, when connected to an external
frequency source.
Figure 1. Connection diagrams (top view)
Figure 2. Current and voltage convention
PENTAWATT HV PENTAWATT HV (022Y) DIP-8 PowerSO-10TM
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VCOMP
VOSC
VDD VDS
ICOMP
IOSC
IDD ID
FC00020
Typical circuit VIPer20A-E
10/34
4 Typical circuit
Figure 3. Offline power supply with auxiliary supply feedback
Figure 4. Offline power supply with optocoupler feedback
AC IN
+Vcc
GND
F1
BR1
D3
R9
C1
R7
C4
C2
TR2
R1
C3
D1
D2
C10
TR1
C9
C7
L2
R3
C6
C5
R2
VIPer20
-
+
13V
OSC
COMP SOURCE
DRAINVDD
FC00401
C11
AC IN
F1
BR1
D3
R9
C1
R7
C4
C2
TR2
R1
C3
D1
D2
C10
TR1
C9
C7
L2
+Vcc
GND
C8
C5
R2
VIPer20
U2
R4
R5
ISO1
R6
R3
C6
-
+
13V
OSC
COMP SOURCE
DRAINVDD
FC00411
C11
VIPer20A-E Operation description
11/34
5 Operation description
5.1 Current mode topology:
The current mode control method, like the one integrated in the devices, uses two control loops
- an inner current control loop and an outer loop for voltage control. When the Power MOSFET
output transistor is on, the inductor current (primary side of the transformer) is monitored with a
SenseFET technique and converted into a voltage VS proportional to this current. When VS
reaches VCOMP (the amplified output voltage error) the power switch is switched off. Thus, the
outer voltage control loop defines the level at which the inner loop regulates peak current
through the power switch and the primary winding of the transformer.
Excellent open loop D.C. and dynamic line regulation is ensured due to the inherent input
voltage feedforward characteristic of the current mode control. This results in improved line
regulation, instantaneous correction to line changes, and better stability for the voltage
regulation loop.
Current mode topology also ensures good limitation in case there is a short circuit. During the
first phase the output current increases slowly following the dynamic of the regulation loop.
Then it reaches the maximum limitation current internally set and finally stops because the
power supply on VDD is no longer correct. For specific applications the maximum peak current
internally set can be overridden by externally limiting the voltage excursion on the COMP pin.
An integrated blanking filter inhibits the PWM comparator output for a short time after the
integrated Power MOSFET is switched on. This function prevents anomalous or premature
termination of the switching pulse in case there are current spikes caused by primary side
capacitance or secondary side rectifier reverse recovery time.
5.2 Stand-by mode
Stand-by operation in nearly open load conditions automatically leads to a burst mode
operation allowing voltage regulation on the secondary side. The transition from normal
operation to burst mode operation happens for a power PSTBY given by :
Where:
LP is the primary inductance of the transformer. FSW is the normal switching frequency.
ISTBY is the minimum controllable current, corresponding to the minimum on time that the
device is able to provide in normal operation. This current can be computed as :
tb + td is the sum of the blanking time and of the propagation time of the internal current sense
and comparator, and represents roughly the minimum on time of the device. Note: that PSTBY
may be affected by the efficiency of the converter at low load, and must include the power
drawn on the primary auxiliary voltage.
PSTBY
1
2
---LPI2STBYFSW=
ISTBY
tbtd
+()VIN
Lp
-----------------------------=
Operation description VIPer20A-E
12/34
As soon as the power goes below this limit, the auxiliary secondary voltage starts to increase
above the 13V regulation level, forcing the output voltage of the transconductance amplifier to
low state (VCOMP < VCOMPth). This situation leads to the shutdown mode where the power
switch is maintained in the Off state, resulting in missing cycles and zero duty cycle. As soon as
VDD gets back to the regulation level and the VCOMPth threshold is reached, the device operates
again. The above cycle repeats indefinitely, providing a burst mode of which the effective duty
cycle is much lower than the minimum one when in normal operation. The equivalent switching
frequency is also lower than the normal one, leading to a reduced consumption on the input
main supply lines. This mode of operation allows the VIPer20A-E to meet the new German
"Blue Angel" Norm with less than 1W total power consumption for the system when working in
stand-by mode. The output voltage remains regulated around the normal level, with a low
frequency ripple corresponding to the burst mode. The amplitude of this ripple is low, because
of the output capacitors and low output current drawn in such conditions.The normal operation
resumes automatically when the power gets back to higher levels than PSTBY
.
5.3 High voltage start-up current suorce
An integrated high voltage current source provides a bias current from the DRAIN pin during
the start-up phase. This current is partially absorbed by internal control circuits which are
placed into a standby mode with reduced consumption and also provided to the external
capacitor connected to the VDD pin. As soon as the voltage on this pin reaches the high voltage
threshold VDDon of the UVLO logic, the device becomes active mode and starts switching. The
start-up current generator is switched off, and the converter should normally provide the
needed current on the VDD pin through the auxiliary winding of the transformer, as shown on
(see Figure 11).
In case there are abnormal conditions where the auxiliary winding is unable to provide the low
voltage supply current to the VDD pin (i.e. short circuit on the output of the converter), the
external capacitor discharges to the low threshold voltage VDDoff of the UVLO logic, and the
device goes back to the inactive state where the internal circuits are in standby mode and the
start-up current source is activated. The converter enters a endless start-up cycle, with a start-
up duty cycle defined by the ratio of charging current towards discharging when the VIPer20-E
tries to start. This ratio is fixed by design to 2A to 15A, which gives a 12% start-up duty cycle
while the power dissipation at start-up is approximately 0.6W, for a 230Vrms input voltage.
This low value start-up duty cycle prevents the application of stress to the output rectifiers as
well as the transformer when a short circuit occurs.
The external capacitor CVDD on the VDD pin must be sized according to the time needed by the
converter to start up, when the device starts switching. This time tSS depends on many
parameters, among which transformer design, output capacitors, soft start feature, and
compensation network implemented on the COMP pin. The following formula can be used for
defining the minimum capacitor needed:
where:
IDD is the consumption current on the VDD pin when switching. Refer to specified IDD1 and IDD2
values.
tSS is the start up time of the converter when the device begins to switch. Worst case is
generally at full load.
VDDhyst is the voltage hysteresis of the UVLO logic (refer to the minimum specified value).
CVDD
IDDtSS
VDDhyst
--------------------
>
VIPer20A-E Operation description
13/34
The soft start feature can be implemented on the COMP pin through a simple capacitor which
will be also used as the compensation network. In this case, the regulation loop bandwidth is
rather low, because of the large value of this capacitor. In case a large regulation loop
bandwidth is mandatory, the schematics of (see Figure 17) can be used. It mixes a high
performance compensation network together with a separate high value soft start capacitor.
Both soft start time and regulation loop bandwidth can be adjusted separately.
If the device is intentionally shut down by tying the COMP pin to ground, the device is also
performing start-up cycles, and the VDD voltage is oscillating between VDDon and VDDoff.
This voltage can be used for supplying external functions, provided that their consumption does
not exceed 0.5mA. (see Figure 18) shows a typical application of this function, with a latched
shutdown. Once the "Shutdown" signal has been activated, the device remains in the Off state
until the input voltage is removed.
5.4 Transconductance error amplifier
The VIPer20A-E includes a transconductance error amplifier. Transconductance Gm is the
change in output current (ICOMP) versus change in input voltage (VDD). Thus:
The output impedance ZCOMP at the output of this amplifier (COMP pin) can be defined as:
This last equation shows that the open loop gain AVOL can be related to Gm and ZCOMP:
AVOL = Gm x ZCOMP
where Gm value for VIPer20A-E is 1.5 mA/V typically.
Gm is defined by specification, but ZCOMP and therefore AVOL are subject to large tolerances.
An impedance Z can be connected between the COMP pin and ground in order to define the
transfer function F of the error amplifier more accurately, according to the following equation
(very similar to the one above):
F(S) = Gm x Z(S)
The error amplifier frequency response is reported in for different values of a simple resistance
connected on the COMP pin. The unloaded transconductance error amplifier shows an internal
ZCOMP of about 330K. More complex impedance can be connected on the COMP pin to
achieve different compensation level. A capacitor will provide an integrator function, thus
eliminating the DC static error, and a resistance in series leads to a flat gain at higher
frequency, insuring a correct phase margin. This configuration is illustrated in Figure 20
As shown in Figure 19 an additional noise filtering capacitor of 2.2nF is generally needed to
avoid any high frequency interference.
Is also possible to implement a slope compensation when working in continuous mode with
duty cycle higher than 50%. Figure 21 shows such a configuration. Note: R1 and C2 build the
classical compensation network, and Q1 is injecting the slope compensation with the correct
polarity from the oscillator sawtooth.
Gm
lCOMP
VDD
-------------------=
ZCOMP
VCOMP
ICOMP
-------------------- 1
Gm
--------VCOMP
VDD
------------------------
×==
Operation description VIPer20A-E
14/34
5.5 External clock synchronization:
The OSC pin provides a synchronisation capability when connected to an external frequency
source. Figure 21 shows one possible schematic to be adapted, depending the specific needs.
If the proposed schematic is used, the pulse duration must be kept at a low value (500ns is
sufficient) for minimizing consumption. The optocoupler must be able to provide 20mA through
the optotransistor.
5.6 Primary peak current limitation
The primary IDPEAK current and, consequently, the output power can be limited using the
simple circuit shown in Figure 22 . The circuit based on Q1, R1 and R2 clamps the voltage on
the COMP pin in order to limit the primary peak current of the device to a value:
where:
The suggested value for R1+R2 is in the range of 220K.
5.7 Over-temperature protection
Over-temperature protection is based on chip temperature sensing. The minimum junction
temperature at which over-temperature cut-out occurs is 140ºC, while the typical value is
170ºC. The device is automatically restarted when the junction temperature decreases to the
restart temperature threshold that is typically 40ºC below the shutdown value (see Figure 13)
IDPEAK
VCOMP 0.5
HID
--------------------------------=
VCOMP 0.6 R1R2
+
R2
-------------------
×=
VIPer20A-E Operation description
15/34
5.8 Operation pictures
Figure 5. VDD Regulation point Figure 6. Undervoltage lockout
Figure 7. Transition time Figure 8. Shutdown action
Figure 9. Breakdown voltage vs temperature Figure 10. Typical frequency variation
ICOMP
ICOMPHI
ICOMPLO
V
DDreg
0
VD
D
Slope =
Gm i n mA/ V
FC00150
VDDon
IDDch
IDD0
VDD
VDDoff
VDS= 35 V
Fsw = 0
IDD
VDDhyst
FC00170
ID
VDS
t
t
tf tr
10% Ipeak
10% VD
90% VD
FC00160
VCOMP
VOSC
ID
t
tDISsu
t
t
ENABLE
DISABLE
ENABLE
VCOMPth
FC00060
Temperature (°C)
FC00180
0 20406080100120
0.95
1
1.05
1.1
1.15
BVDSS
(Normalized)
Temperature (°C)
0 20 40 60 80 100 120 140
-5
-4
-3
-2
-1
0
1
FC00190
(%)
Operation description VIPer20A-E
16/34
Figure 11. Behaviour of the high voltage current source at start-up
Figure 12. Start-up waveforms
Ref.
UNDERVOLTAGE
LOCK OUT LOGIC
15 mA1 mA
3 mA
2 mA
15 mA
VDD DRAIN
SOURCE
VIPer20
Auxiliary primary
winding
VDD
t
VDDoff
VDDon
Start up duty cycle ~ 12%
CVDD
FC00101A
VIPer20A-E Operation description
17/34
Figure 13. Over-temperature protection
SC 101 91
T
J
T
tsd
-T
h yst
T
ts c
V
dd
V
dd on
V
dd off
I
d
V
co m p
t
t
t
t
Operation description VIPer20A-E
18/34
Figure 14. Oscillator
Rt
Ct
OSC
VDD
~360
CLK
FC00050
Ct
Fsw
40kHz
15nF
22nF
Forbidden area
Forbidden area
Ct(nF) = Fsw(kHz)
880
1 2 3 5 10 20 30 50
30
50
100
200
300
500
1,000
Rt (k)
Frequency (kHz)
Oscillator frequency vs Rt and Ct
Ct = 1.5 nF
Ct = 2.7 nF
Ct = 4.7 nF
Ct = 10 nF
FC00030FC00030
For Rt > 1.2k and Ct 40KHz
VIPer20A-E Operation description
19/34
Figure 15. Error amplifier frequency response
Figure 16. Error amplifier phase response
0.001 0.01 0.1 1 10 100 1,000
(20)
0
20
40
60
Frequency (kHz)
Voltage Gain (dB)
RCOMP = +
RCOMP = 270k
RCOMP = 82k
RCOMP = 27k
RCOMP = 12k
FC00200
0.001 0.01 0.1 1 10 100 1,000
(50)
0
50
100
150
200
Frequency (kHz)
Phase (°)
RCOMP = +
RCOMP = 270k
RCOMP = 82k
RCOMP = 27k
RCOMP = 12k
FC00210
Operation description VIPer20A-E
20/34
Figure 17. Mixed soft start and compensation Figure 18. Latched shut down
Figure 19. Typical compensation network Figure 20. Slope compensation
Figure 21. External clock sinchronisation Figure 22. Current limitation circuit example
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
R1
C1 +C2
D1
R2
R3
D2
D3
+C3
AUXILIARY
WINDING
FC00431
C4
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
Shutdown Q1
Q2
R1
R2R3
R4
D1
FC00440
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
R1
C1
FC00451
C2
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
R1R2
Q1
C2
C1 R3
FC00461
C3
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
10 k
FC00470
-
+
13V
OSC
COMP SOURCE
DRAINVDD
VIPer20
R1
R2
Q1
FC00480
VIPer20A-E Electrical over stress
21/34
6 Electrical over stress
6.1 Electrical over stress ruggedness
The VIPer may be submitted to electrical over-stress, caused by violent input voltage surges or
lightning. Following the Layout Considerations is sufficient to prevent catastrophic damages
most of the time. However in some cases, the voltage surges coupled through the transformer
auxiliary winding can exceed the VDD pin absolute maximum rating voltage value. Such events
may trigger the VDD internal protection circuitry which could be damaged by the strong
discharge current of the VDD bulk capacitor. The simple RC filter shown in Figure 23 can be
implemented to improve the application immunity to such surges.
Figure 23. Input voltage surges protection
C1
Bulk capacitor
D1
R1
(Optional)
C2
22nF
Auxilliary winding
13V
OSC
COMP SOURCE
DRAIN
VDD
-
+
VIPerXX0
R2
39R
Layout VIPer20A-E
22/34
7 Layout
7.1 Layout considerations
Some simple rules insure a correct running of switching power supplies. They may be
classified into two categories:
Minimizing power loops: The switched power current must be carefully analysed and
the corresponding paths must be as small an inner loop area as possible. This avoids
radiated EMC noises, conducted EMC noises by magnetic coupling, and provides a
better efficiency by eliminating parasitic inductances, especially on secondary side.
Using different tracks for low level and power signals: Interference due to mixing of
signal and power may result in instabilities and/or anomalous behaviour of the device
in case of violent power surge (Input overvoltages, output short circuits...).
In case of VIPer, these rules apply as shown on (see Figure 24).
Loops C1-T1-U1, C5-D2-T1, and C7-D1-T1 must be minimized.
C6 must be as close as possible to T1.
Signal components C2, ISO1, C3, and C4 are using a dedicated track connected
directly to the power source of the device.
Figure 24. Recommended layout
T1
U1
VIPerXX0
13V
OSC
COMP SOURCE
DRAINVDD
-
+
C4
C2
C5
C1
D2
R1
R2
D1
C7
C6
C3
ISO1
Fr om input
diodes bridge
To secondary
f i l t er i n g and l o ad
FC00500
VIPer20A-E Package mechanical data
23/34
8 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages.
These packages have a Lead-free second level interconnect . The category of second Level
Interconnect is marked on the package and on the inner box label, in compliance with JEDEC
Standard JESD97. The maximum ratings related to soldering conditions are also marked on
the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at:
www.st.com.
Package mechanical data VIPer20A-E
24/34
Table 9. Pentawatt HV Mechanical data
Figure 25. Package dimension
Dim
mm. inch
Min Typ Max Min Typ Max
A 4.30 4.80 0.169 0.189
C 1.17 1.37 0.046 0.054
D 2.40 2.80 0.094 0.11
E 0.35 0.55 0.014 0.022
F 0.60 0.80 0.024 0.031
G1 4.91 5.21 0.193 0.205
G2 7.49 7.80 0.295 0.307
H1 9.30 9.70 0.366 0.382
H2 10.40 0.409
H3 10.05 10.40 0.396 0.409
L 15.60 17.30 6.14 0.681
L1 14.60 15.22 0.575 0.599
L2 21.20 21.85 0.835 0.860
L3 22.20 22.82 0.874 0.898
L5 2.60 3 0.102 0.118
L6 15.10 15.80 0.594 0.622
L7 6 6.60 0.236 0.260
M 2.50 3.10 0.098 0.122
M1 4.50 5.60 0.177 0.220
R 0.50 0.02
V4 90°
Diam 3.65 3.85 0.144 0.152
P023H3
VIPer20A-E Package mechanical data
25/34
Table 10. Pentawatt HV 022Y ( Vertical High Pitch ) Mechanical data
Figure 26. Package dimension
Dim
mm. inch
Min Typ Max Min Typ Max
A 4.30 4.80 0.169 0.189
C 1.17 1.37 0.046 0.054
D 2.40 2.80 0.094 0.110
E 0.35 0.55 0.014 0.022
F 0.60 0.80 0.024 0.031
G1 4.91 5.21 0.193 0.205
G2 7.49 7.80 0.295 0.307
H1 9.30 9.70 0.366 0.382
H2 10.40 0.409
H3 10.05 10.40 0.396 0.409
L 16.42 17.42 0.646 0.686
L1 14.60 15.22 0.575 0.599
L3 20.52 21.52 0.808 0.847
L5 2.60 3.00 0.102 0.118
L6 15.10 15.80 0.594 0.622
L7 6.00 6.60 0.236 0.260
M 2.50 3.10 0.098 0.122
M1 5.00 5.70 0.197 0.224
R 0.50 0.02 0.020
V4 90°90°
Diam 3.65 3.85 0.144 0.154
A
C
H2
H3
H1
L5
DIA
L3
L6
L7
F
G1
G2
LL1
D
R
M
M1
EResin between
leads
V4
Package mechanical data VIPer20A-E
26/34
Figure 27. Package dimensions
Table 11. DIP-8 Mechanical data
Dim.
mm Inch
Min Typ Max Min Typ Max
A 3.32 0.131
a1 0.51 0.020
B 1.15 1.65 0.045 0.065
b 0.356 0.55 0.014 0.022
b1 0.204 0.304 0.008 0.012
D 10.92 0.430
E 7.95 9.75 0.313 0.384
e 2.54 0.100
e3 7.62 0.300
e4 7.62 0.300
F 6.6 0.260
I 5.08 0.200
L 3.18 3.81 0.125 0.150
Z 1.52 0.060
VIPer20A-E Package mechanical data
27/34
Figure 28. Package dimension
Table 12. PowerSO-10 mechanical data
Dim.
mm Inch
Min Typ Max Min Typ Max
A 3.35 3.65 0.132 0.144
A1 0.00 0.10 0.000 0.004
B 0.40 0.60 0.016 0.024
C 0.35 0.55 0.013 0.022
D 9.40 9.60 0.370 0.378
D1 7.40 7.60 0.291 0.300
e 1.27 0.050
E 9.30 9.50 0.366 0.374
E1 7.20 7.40 0.283 0.291
E2 7.20 7.60 0.283 0.300
E3 6.10 6.35 0.240 0.250
E4 5.90 6.10 0.232 0.240
F 1.25 1.35 0.049 0.053
h 0.50 0.002
H 13.80 14.40 0.543 0.567
L 1.20 1.80 0.047 0.071
q 1.70 0.067
α0o 8
o
Package mechanical data VIPer20A-E
28/34
Figure 29. Power Pad layout
Figure 30. Tube shipment
Table 13. Tube shipment
Base Q.ty Bulk Q.ty Tube length (± 0.5) A B C (± 0.1)
Casablanca 50 1000 532 10.4 16.4 0.8
Muar 50 1000 532 4.9 17.2 0.8
VIPer20A-E Package mechanical data
29/34
Figure 31. Reel shipment
Note: All dimensoin are in mm.
Table 14. Reel dimension
Base Q.ty 600
Bulk Q.ty 600
A (max) 330
B (min) 1.5
C (± 0.2) 13
F 20.2
G (± 0.2) 24.4
N (min) 60
T (max) 30.4
Package mechanical data VIPer20A-E
30/34
Figure 32. Tape shipment
Note: All dimensions are in mm.
Table 15. Tape dimension
Tape width W 24
Tape Hole Spacing P0 (± 0.1) 4
Component Spacing P 24
Hole Diameter D (± 0.1/-0) 1.5
Hole Diameter D1 (min) 1.5
Hole Position F (± 0.05) 11.5
Compartment Depth K (max) 6.5
Hole Spacing P1 (± 0.1) 2
VIPer20A-E Package mechanical data
31/34
Figure 33. Pentawatt HV tube shipment ( no suffix )
Note: All dimensions are in mm.
Figure 34. Dip-8 Tube shipment (no suffix)
Note: All dimensions are in mm.
Table 16. Tube dimension
Base Q.ty 50
Bulk Q.ty 1000
Tube length (± 0.5 ) 532
A 18
B 33.1
C (± 0.1) 1
Table 17. Tube dimension
Base Q.ty 20
Bulk Q.ty 1000
Tube length (± 0.5 ) 532
A 8.4
B 11.2
C (± 0.1) 0.8
Order code VIPer20A-E
32/34
9 Order code
Table 18. Order code
Part number Package
VIPer20A-E PENTAWATT HV
VIPer20A-22-E PENTAWATT HV (022Y)
VIPer20ADIP-E DIP-8
VIPer20ASP-E PowerSO-10
VIPer20A-E Revision history
33/34
10 Revision history
Table 19. Revision history
Date Revision Changes
28-Sep-2005 1 Initial release.
21-Jun-2006 2 New template, few updates
VIPer20A-E
34/34
Please Read Carefully:
Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the
right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any
time, without notice.
All ST products are sold pursuant to ST’s terms and conditions of sale.
Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no
liability whatsoever relating to the choice, selection or use of the ST products and services described herein.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this
document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products
or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such
third party products or services or any intellectual property contained therein.
UNLESS OTHERWISE SET FORTH IN ST’S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED
WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS
OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT.
UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZE REPRESENTATIVE OF ST, ST PRODUCTS ARE NOT DESIGNED,
AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS,
NOR IN PRODUCTS OR SYSTEMS, WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR
SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE.
Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void
any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any
liability of ST.
ST and the ST logo are trademarks or registered trademarks of ST in various countries.
Information in this document supersedes and replaces all information previously supplied.
The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners.
© 2006 STMicroelectronics - All rights reserved
STMicroelectronics group of companies
Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan -
Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America
www.st.com