1
General Description
The Supertex HV9221 is a dual high-speed Current Mode Switch-
ing Power Supply controller that can start and run directly from
almost any DC input from 15 volts DC to rectified and filtered 240
volt AC line. This unique input circuit allows the HV9221 to self-
start directly from a high voltage input, and subsequently take the
power from an auxiliary converter output which it is controlling,
thus allowing very efficient operation while maintaining input-to-
output galvanic isolation limited only by the insulation system of
the associated magnetic assembly. When powered by the auxil-
iary converter outputs or with both outputs disabled (oscillator
shuts down) the input current on the +VIN pin is reduced to a
maximum of 50µA which is beneficial especially in telecommuni-
cation applications.
HV9221
High Frequency Multi-Function
Current Mode PWM Controller
Device 28-pin DIP SOW-28 Die
HV9221 HV9221P HV9221WG HV9221X
Ordering Information
Package Options
Operating Modes
1. Single push-pull converter.
2. Dual 49% duty cycle controller with 180° phasing.
3. Dual 99% duty cycle controller with 180° phasing.
Advance Information
Absolute Maximum Ratings*
+VIN, Input Voltage -0.5V to +450V
VCC, Supply Voltage -0.5V to +15.5V
Operating Temperature Range -40°C to +85°C
Storage Temperature Range -65°C to +150°C
Power Dissipation @ 25°CSOW-28 1.0W
28-pin DIP 1.2W
Note:
*All voltages are referenced to GND.
Features
❏Current-mode control
❏15 to 450 volt input range internal start-up circuit
❏50µA standby supply current
❏2mA operating supply current
❏Under-voltage lockout
❏Internal soft start
❏1% tolerance band gap voltage reference
❏1.5 MHz low offset error amplifier
❏1 MHz oscillator
❏High current output drivers (1.5A peak, 0.5A continuous)
❏Driver outputs have low output impedance with VCC = 0V
❏Current sense leading edge threshold switching
❏Fast (25 nsec) over current shutdown
❏Buffered slope compensation ramp generators
❏Fault tolerant single pin synchronization of multiple
converters
❏All pins are ESD protected
11/12/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
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HV9221
Supply
ICC Supply current 2 mA CLOAD = 50pF, fOSC = 500KHz
Pre-regulator/Start-up
+VIN Input voltage 15 450 V
+IIN Input leakage current 20 50 µA+V
IN = 450V, VCC = VREG,
Enable A & B = 0
ISTART Pre-regulator start-up current 40 mA +VIN = 15V, VCC = Vuvlo,
Enable A & B = 0
VPR VCC pre-regulator voltage 7.8 8.0 8.2 V +VIN = 15 to 450V
VDELTA VPR - Vuvlo (turn-on) 0.1 0.2 0.3 V
VHYST Under voltage lockout hysteresis 0.9 1.0 1.1 V
Over voltage lockout 14.5 15.0 15.5 V
Over voltage lockout hysteresis 2.5 3.0 3.5 V
Reference
VRReference output voltage 2.48 2.50 2.52 V TA = 25°C
Load regulation 1 5 mV 0 mA < IREF < 3mA
Line regulation 2 mV UVLO stop threshold
+0.5V < VCC < 13V
VRReference output voltage 2.45 2.50 2.55 V Full temp. range, 0mA < IREF
< 3mA
Output noise voltage 200 µV 10Hz < f < 10KHz, TJ = 25°C
Long term stability 3 mV TA = 125°C, 1000 hrs.
ISREF Short circuit current -4 -6 -10 mA
Electrical Characteristics
(Unless otherwise specified, -VIN = 0V, VCC = 10V; -40ºC ≤ TA ≤ +85ºC)
Symbol Parameters Min Typ Max Unit Conditions
Error Amplifiers
IFB or INI Input bias current ±25 ±200 nA VFB = 3.0V, VNI = 2.5V
VOS Input offset voltage ±5±25 mV
VCM Common mode input range 0 VCC V
AVOL Open loop voltage gain 60 80 dB
BW Unity gain bandwidth 1.5 2.5 MHz
IOUT Output current sourcing -2 -1 mA VFB < VNI
IOUT Output current sinking 2 4 mA VFB > VNI
PSRR Power supply rejection 50 90 dB 8.5V < VCC < 14.5
MOSFET Driver Outputs
0.10 0.15 V IOUT = 20mA
VOL Output low level 0.3 0.6 V IOUT = 500mA
0.5 0.7 V IOUT = 20mA, VCC = 0V
VOH Output high level (VCC - VOUT) 0.12 0.2 V IOUT = -20mA
0.4 0.7 V IOUT = -500mA
ISOURCE Peak output current sourcing -1500 -1300 mA VOUT = 0V
ISINK Peak output current sinking 1300 1500 mA VOUT = VCC
Output rise time 20 30 ns CLOAD = 2nF
Output fall time 20 30 ns CLOAD = 2nF
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HV9221
Electrical Characteristics (continued)
(Unless otherwise specified, -VIN = 0V, VCC = 10V; -40ºC ≤ TA ≤ +85ºC)
Symbol Parameters Min Typ Max Unit Conditions
Oscillator
900 1000 1100 KHz RT = TBD, RD = 0
fOSC Initial accuracy 450 500 550 KHz RT = TBD, RD = 0
90 100 110 KHz RT = TBD, RD = 0
Temperature coefficient 100 300 ppm/C fOSC = 100KHz
Voltage stability 1 2 % fOSC=100KHz, 15V >VCC > 8V
VSYNC(out)high Sync output voltage - high 4.5 5.0 5.5 V
ICYNC(out)high Sync output current - high 10 µA
VSYNC(out)low Sync output voltage - low 0.3 0.5 V
ISYNC(out)low Sync output current - low 0.5 -1.0 mA
VSYNC(in) Maximum Sync input voltage 5.5 V
VSYNC(in) Sync threshold - low 0.8 1.7 2.0 V
ISYNC(in) Sync input current - low -20 -30 µA
Current Sensing
VCSA & VCSB Usable control current sense range 0.5 1.0 V
VCSA & VSCB Current limit threshold 1.1 1.2 1.3 V
VCSA & VCSB Leading edge current limit threshold 1.1 1.3 1.5 V
Leading edge threshold time 45 50 55 nsec
Current limit delay to output 30 50 nsec
Slope Compensation Ramp Generators
VCSA or VCSB Peak voltage 0.9 1 1.1 V 49% duty cycle or push-pull
mode
VSCA or VSCB Peak voltage 1.8 2.0 2.2 V 99% duty cycle mode
VSCA or VSCB Valley voltage 0 0.01 0.02 V
Output impedance 5 Ω
Logic Controls Inputs (ENABLE-A, ENABLE-B, PP, 49%/99%)
VENABLE Maximum input voltage VCC V
VENABLE Open terminal voltage 0.5VCC V
VENABLE(high) Pull high threshold voltage -1.8 -2.0 -2.2 V Referenced to VCC
IENABLE(high) Pull high input current 100 µA
VENABLE(low) Pull low threshold voltage 1.8 2.0 2.2 V
IENABLE(low) Pull low input current -100 µA
Over Temperature Shutdown
Shutdown junction temperature 110 125 140 °C
Hysteresis (temperature drop) 40 50 60 °C
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HV9221
Block Diagram
–
+
+
–
–
+
–
–
+
+
+
+
–
–
+
–
–
+
+
–
NIA FBA CSA ENABLE-A REF VCC
+VIN
GND
OUT-A
OUT-B
PWRGND
COMPA
TN-Level
Enable
Detection
and Latch
50nSec
One-Shot
Tri-Level
Enable
Detection
and Latch
50-Sec
One-Shot
5mSec
Soft-Start
5mSec
Soft-Start
Over Current Comparator A
Over Current
Comparator B
1.2V
Internal
Reference
Generators
Thermal Shutdown
and Latch Circuit
8.0V 0.2V
UVLO
OVLO
+15.0V
Substrate
R
SQ
SQ
R
PP
PP
A
B
ENA
ENB
Oscillator
RTRDSYNCMODESCBSCACSBCOMPBFBBNIB ENABLE-B
1K
10
1.2V
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HV9221
Pin Descriptions
GND - Ground connection for all low level analog and digital
circuits.
PWRGND - This pin provides ground return for the high transient
currents of the output driver circuits.
+VIN - This is the start-up pre-regulator input which can accept
input voltages in the range of 15 to 450 volts DC.
VCC - This is the supply pin to the PWM circuit. During start-up
this pin is powered by the start-up linear pre-regulator which
regulates to a nominal voltage of 8 volts over the full input voltage
range of the +VIN pin.
OUT-A, OUT-B - These high current push-pull outputs of the
PWM are designed to drive the gates of power MOSFETs.
REF - This pin provides a 1% accuracy 2.5 volts buffered, low
output impedance reference.
ENABLE-A, ENABLE B - These input pins provide means for
shutting down the PWM.
MODE - This input is used to select the operating mode of this
PWM. The mode selections are as follows:
Pin Connection Operating Mode
GND 49% Dual PWM
OPEN 99% Dual PWM
VCC 49% Single Push-Pull PWM
SYNC - This bidirectional Input/Output negative transition active
pin provides a means for synchronizing several PWM chips or
synchronizing against an application system master oscillator.
SCA, SCB - These low impedance output buffered ramp
generators provide positive going ramp outputs corresponding
to the mode of operation of this PWM circuit and is intended to
enable the user to provide optimal slope compensation to the
feedback circuits.
CSA, CSB - These are the current sense inputs to the PWM
comparators.
COMPA, COMPB - The low impedance output of the error
amplifiers.
FBA, FBB - The high impedance inverting input of the error
amplifiers.
NIA, NIB - The high impedance non-inverting input of the error
amplifiers.
RT - The oscillator charging current is set by the value of the
resistor connected from RT to GND.
RD - External resistor to GND to control the discharge rate of the
internal timing capacitor.
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
www.supertex.com
11/12/01
©2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
