COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
1
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
General Description
The AP3105/V/L/R is a low startup current, current
mode PWM controller with green-mode power-saving
operation. The PWM switching frequency at normal
operation is set with 65kHz typically and the dithering
of frequency will also improve the EMI feature. When
the load decreases, the frequency will reduce and when
at a very low load, the IC will enter theþburst modeÿ
to minimize switching loss.
About 20kHz frequency switch ing is to avoid th e audi-
ble noise as well as reducing the standby loss. The skip
mode point can be adjusted through the ex ternal resis-
tor connected to the current sense resistor.
The AP3105/V/L/R features a lot of functions such as
the Leading-Edge Blanking (LEB) of the current sens-
ing, internal slope compensation and several protection
functions including cycle-by-cycle current limit
(OCP), VCC Over Voltage Protection (VOVP), OTP
and OLP protection. The versatile latch function can be
set by the customer through few components.
This IC is available in SOT-23-6 package.
Features
gVery Low Start-up Current
gCurrent Mode Control
gNon-audible-noise Green-mode Control
gSkip Mode Adjustable
gInternal Slope Compensation
gSoft Start During Startup Process
gFrequency Fold Back for High Average Effi-
ciency
gSecondary Short Winding Protection with FOCP
gSoft Switching for Reducing EMI
gVCC Maintain Mode
gLatch Function for OTP/OVP
gUseful Pin Fault Protection:
SENSE Pin Floating
CTRL Pin Short to Ground
FB/Opto-coupler Open/ Sh ort
gComprehensive System Protection Feature:
VCC Over Voltage Protection (VOVP)
Over Load Protection (OLP)
gMini Size with Packages
gPin to Pin Compatible with AP3103
Applications
gSwitching AC-DC Adapter/Charger
gATX/BTX Auxiliary Power
gSet-top Box(STB) Power Supply
gOpen Frame Switching Power Supply
Figure 1. Package Type of AP3105/V/L/R
SOT-23-6
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
2
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Pin Configuration
Pin Number Pin Name Function
1 GND Signal ground. Current return for driver and control circuits
2 FB Feedback. Directly connected to the opto-coupler
3CTRL
Latch trigger if this pin voltage drops below a threshold or over another threshold,
leave CTRL pin open if this function is not needed. Connecting a NTC thermistor to
GND can achieve OTP protection
4 SENSE Current Sense
5 VCC Supply voltage of driver and control circuits
6 GAT E Gate driver output
Pin Description
(SOT-23-6)
GATE
GND
K Package
Figure 2. Pin Configuration of AP3105/V/L/R (Top View)
1
2
34
5
Pin 1 Mark
6
FB
CTRL
VCC
SENSE
3
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Data Sheet
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Functional Block Diagram
Figure 3. Functional Block Diagram of AP3105/V/L/R
GND
GATE
250ns LEB
Driver 13V
QD
CLK
RB
DFF
OSC with
Frequency Jitter
0.85V
VCC_OVP
OLP
VCC
32V
28V
VCC_OVP
OVP
UVLO
UVLO
15.5V
8.6V Internal
Bias
0.5V
Auto
Recovery
Protection
AP3105/V/L/R
100uA
Line
Compensation
FB
R
2R
Burst
PWM
1.1V
Soft Start
0.5V
CTRL_H
1.8V
Latch-off
Protection
OCP
32mS Delay
OLP
FOCP
FOCP
2.5V
3.6V0.6V
10K
CTRL_H
CTRL_L
CTRL_L
1
2
53
6
CTRL
SENSE
4
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
4
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Ordering Information
Circuit Type
Package
K: SOT-23-6
G1: Green
AP3105 -
TR: Tape and Reel
Package Part Number Marking ID Packing Type
SOT-23-6
AP3105KTR-G1 GHN Tape & Reel
AP3105VKTR-G1 GHO Tape & Reel
AP3105LKTR-G1 GHP Tape & Reel
AP3105RKTR-G1 GHQ Tape & Reel
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green.
Product Version*
Blank: AP3105
V: AP3105V
L: AP3105L
R: AP3105R
Product Version Frequency VOVP OLP& SOCP CTRL (Low) CTRL (High)
AP3105 65kHz Auto-Recoverable Auto-Recoverable Latch Auto-Recoverable
AP3105V 65kHz Latch Auto-Recoverable Latch Latch
AP3105L 65kHz Latch Latch Latch Latch
AP3105R 65kHz Auto-Recoverable Auto-Recoverable Auto-Recoverable Latch
* Product Version Classification (with Different Protection Functions)
5
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Data Sheet
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Parameter Symbol Value Unit
Power Supply Voltage VCC 30 V
Gate Output Current IO 350 mA
Input Voltage to FB, SENSE, CTRL VFB, VSENSE,VCTRL -0.3 to 7 V
Thermal Resistance
(Junction to Ambient) TJA 250 oC/W
Power Dissip ation at TA<25oCPD500 mW
Operating Junction Temperature TJ-40 to150 oC
Storage Temperature Range TSTG 150 oC
ESD (Human Body Model) 3000 V
ESD (Machine Model) 300 V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter Symbol Min Max Unit
Supply Voltage VCC 10 25 V
Absolute Maximum Ratings (Note 1)
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
6
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
VCC=16V, TA=25oC, unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
Supply Voltage (VCC Pin)
Startup Current ISTARTUP 2525PA
Operating Supply Current ICC VFB=0V, CL=1nF 0.5 0.85 1.2 mA
VFB=3V, CL=0nF 0.6 1.2 2.0
UVLO (on) 14.5 15.5 16.5 V
VCC Maintain 9.7 10.2 10.7 V
UVLO (off) 7.6 8.6 9.6 V
VCC OVP 27 28.5 30 V
VCC Clamp ICC=5mA 31 34 V
PWM Section/Oscillator Section
Maximum Duty Cycle 70 75 80 %
Oscillation Frequency 60 65 70 kHz
Green Mode Frequency 20 30 kHz
Frequency Temperature
Stability -20oC to 125oC (Note 2) 5%
Frequency Voltage Stability VCC=12V to 30V 3%
Frequency Dithering r4r6r8%
Current Sense Sectio n (SENSE Pin)
Maximum SENSE Voltage VCS VFB=3.6V 0.800 0.850 0.900 V
FOCP Voltage 1.65 1.8 1.95 V
LEB Time of SENSE 150 250 350 ns
Delay to Output (Note 2) 100 ns
Soft-start Time 3 5 8 ms
Feedback Input Section (FB Pin)
The Ratio of Input Voltage
to Current Sense Voltage 2.533.5V/V
Input Impedance 7 10 13 k:
Source Current VFB=0V -0.75 -0.5 -0.25 mA
Green Mode Threshold 2 V
Input Voltage for Zero Duty 1.3 1.55 1.8 V
Electrical Characteristics
7
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Data Sheet
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Electrical Characteristics
VCC=16V, TA=25oC, unless otherwise specified.
Parameter Symbol Conditions Min Typ Max Unit
Output Section (GATE Pin)
Output Low Level IO=20mA, VCC=12V 1 V
Output High Level IO=20mA, VCC=12V 8 V
Output Clamping 11 13 15 V
Rising Time (Note 2) CL=1nF, VCC=13V 150 250 ns
Falling Time (Note 2) CL=1nF, VCC=13V 50 100 ns
Protection Section (CTRL Pin)
Source Current 90 100 110 PA
Internal Reference Voltage 1.5 V
Low Threshold Trigger for Latch 0.47 0.5 0.53 V
High Threshold Trigger for Latch 2.35 2.5 2.65 V
Pull-up Current (Note 3) 2mA
Delay Time Section
Delay of Short Circuit Protection 22 32 40 ms
Delay of Hiccup Protection VCC OVP 25 Ps
Note 2. Guaranteed by design.
Note 3. The sourcing current of CTRL pin must be limited below 5mA.Otherwise it may cause permanent damage
to the device.
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
8
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics
Figure 4.
Startup Voltage vs. Ambient Temperature
Figure 5.
Shutdown Voltage vs. Ambient Temperature
Figure 6.
Startup Current vs. Ambient Temperature Figure 7. Operating Current vs. Ambient Temperature
-40 -20 0 20 40 60 80 100 120 140
13.0
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
18.0
Startup Voltage (V)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120 140
7.0
7.5
8.0
8.5
9.0
9.5
10.0
Shutdown Voltage (V)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120 140
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
Startup Current (PA)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120 140
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Operating Current (mA)
Ambient Temperature (oC)
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
9
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
CTRL Utilization for Latch
OVP and OTP OVP OTP
CTRL
VCC
NTC
Option
CTRL
VCC
NTC
Option
VCC
CTRL
NTC
Option
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
10
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Operation Description
The AP3105/V/L/R is specifically designed for off-line
AC-DC power supply used in LCD monitor, n otebook
adapter and battery charger ap plications. It of fers a cost
effective solution with a versatile protection function.
Start-up Current and UVLO
The start-up current of AP3105/V/L/R is optimized to
realize ultra low current (5PA typical) so that VCC
capacitor can be charged more quickly. The direct
benefit of low start-up current is the availability of
using large start-up resistor, which minimizes the
resistor power loss for high voltage AC input.
An UVLO comparator is included in AP3105/V/L/R to
detect the voltage on VCC pin. It ensu res that AP3105/
V/L/R can draw adequate energy from hold-up
capacitor during power-on. The turn-on threshold is
15.5V and the turn-off threshold is 8.6V.
Current Sense Comparator and PWM
Latch
The AP3105/V/L/R operates as a current mode
controller, the output switch conduction is initiated by
every oscillator cycle and is terminated when the peak
inductor current reaches the threshold level established
by the FB pin. The inductor current signal is converted
to a voltage signal by inserting a reference sense
resistor RS. The inductor current under normal
operating conditions is con trolled by the voltage at FB
pin. The relation between peak inductor current (IPK)
and VFB is:
Moreover, FOCP with 1.8V threshold is only about
100ns delay, which can avoid some catastrophic
damages such as secondary rectifier short test. Few
drive cycles can alleviate the destruction range and get
better protection.
Leading
edge Blanking
A narrow spike on the leading edge of the current
waveform can usually be observed when the power
MOSFET is turned on. A 250ns leading-edge blank is
built-in to prevent the false-triggering caused by the
turn-on spike. During this period, the current limit
comparator is disabled and the gate driver can not be
switched off.
At the time of turning on the MOSFET, a negative
undershoot (maybe larger than -0.3V) can occur on the
SENSE pin. So it is strongly recommended to add a
small RC filter or at least connect a resistor ĀRā on
this pin to protect the IC (Shown as Figure 8).
Figure 8
Built-in Slope Compensation
It is well known that a continuous cu rrent mod e SMPS
may become unstable when the duty cycle exceeds
50%. The built-in slope compensation can improve the
stability, so there is no need for design engineer to
spend much time on that.
FB Pin and Short Circuit Protection
This pin is normally connect ed to the op to-coupler and
always paralleled with a capacitor for loop
compensation. When the voltage at this pin is greater
than 4.2V and lasts for about 32ms, the IC will enter
the protection mode. For AP3105/V/R, the system will
enter hiccup mode to wait the VCC decreasing to low
UVLO level, then the IC will try to restart until the
failure removed. And when this voltage is less than
1.55V, the IC will stop the drive pulse immediately.
Therefore, this feature can be used for short circuit
protection, which makes the system immune from
damage. Normally, output short m akes the VFB value
to the maximum because the opto-coupler is cut off.
VCC Maintain Mode
During light load or step load , VFB will drop and be
SFBPK RVI 3/)8.0(
FB
SENSE
GATE
GND
CTRL 6
1
3
4
AP3105
VCC
5
2
Large undershoot (more than
-0.3V) may damage the SENSE pin
R
C
Necessary
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
11
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Operation Description (Continued)
lower than 1.55V, thus the PWM drive signal will
be stopped, and there is no more new energy transfered
due to no switching. Therefore, the IC supply voltage
may reduce to the shutdown threshold voltage and
system may enter the unexpected restart mode. To
avoid this, the AP3105/V/L/R hold a so-called VCC
maintain mode which can supply energy to VCC.
When VCC decreases to a setting threshold, the VCC
maintain comparator will output some drive signal to
make the system switch and provide a proper energy to
VCC pin. The VCC maintain function will cooperate
the PWM and burst mode loop which can make the
output voltage variation be within the regulation. This
mode is very useful for reducing startup resistor loss
and achieve a better standby performance with a low
value VCC capacitor. The VCC is not easy to touch the
shutdown threshold during the startup process and step
load. This will also simplify the system design. The
normal VCC voltage is suggested to be designed a little
higher than VCC maintain threshold thus can achieve
the best balance between the standby and step load
performance.
System Protection and Pin Fault
Protection
The AP3105/V/L/R provides versatile system and pin
fault protections. The OCP comparator realizes the
cycle-by-cycle current limiting (OCP). In universal
input line voltage, the IC realizes the constant over
load protection (OLP). VCC over voltage protection
can be applied as the primary OVP or opto-coupler
broken protection. The AP3105/V/L/R also has pin
fault connection protection including floating and short
connection. The floating pin protection include the
SENSE, FB, etc.. The short pin protection includes the
CTRL pin short protection. When these pins are floated
or CTRL pin is shorted to ground, PWM switching will
be disabled, thus protecting the power system.
Latch Protection Function
For some applications, the system requires the latch
protection function. The CTRL pin has two kinds of
modes to trigger the lat ch protection: high level tri gger
and low level trigger. The low threshold is 0.5V and
high threshold voltage is 2.5V. Some versio n will have
only one mode. Once the latch protection is triggered,
the IC will disable the output signal, and the bulk
capacitor provides the energy to IC through the startup
resistor to ensure the IC disable the output (latch
mode). This mode will be not released until the AC
input is shut off. So, the de-latch time is mainly
depending on the HV startup bulk capacitor value.
Therefore, if the system want a short de-latch time, it is
better for the startup resistor take power from the point
before the rectifier bridge as illustrated in below figure.
VCC
GND
FB
CTRL
AP3105V/L/R
SENSE
AC Mains
(90V to 265V) CBUS
GATE
1
2
3
4
56
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Data Sheet
12
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Figure 9. Typical Application of AP3105/V/L/R
Typical Application
a
a
VCC
GND
GATE
FB
SENSE
CTRL
a
AZ431
AP3105/V/L/R
L2
T1
R13 C7
C6
C8
R14
R15
R16 R17
R18
C9
U2
C10
R12R11
R10
R9
R8
C5
R6
R19
C4
R5
R4
C2
C1
VR1
U1
NTC
R2 R3
F1
R7
C3
C11
NTC
R20
13
Nov. 2012 Rev. 1. 2 BCD Semiconductor Manufacturing Limited
Data Sheet
COST EFFECTIVE GREEN PWM CONTROLLER AP3105/V/L/R
Mechanical Dimensions
SOT-23-6 Unit: mm(inch)
2.820(0.111)
3.020(0.119)
2.650(0.104)
2.950(0.116)
1.500(0.059)
1.700(0.067)
0.950(0.037)TYP
1.800(0.071)
2.000(0.079)
0.300(0.012)
0.400(0.016)
0.700(0.028)REF
0.100(0.004)
0.200(0.008)
0e
8e
0.200(0.008)
0.300(0.012)
0.600(0.024)
0.000(0.000)
0.150(0.006)
0.900(0.035)
1.300(0.051) 1.450(0.057)
MAX
123
4
5
6
Pin 1 Mark
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturin g Limited does not assume any responsibility for us e of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability aris ing out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Limited
800, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
BCD Semiconductor Manufacturing Limited
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd. Shenzhen Office
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Tel: +86-755-8826 7951
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Tel: +86-21-6495 9539, Fax: +86-21-6485 9673
BCD Semiconductor Manufacturing Limited
http://www.bcdsemi.com
BCD Semiconductor Manufacturing Limited
IMPORTANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturin g Limited does not assume any responsibility for us e of any its products for any
particular purpose, nor does BCD Semiconductor Manufacturing Limited assume any liability aris ing out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd.
800 Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
MAIN SITE
REGIONAL SALES OFFICE
Shenzhen Office
Shanghai SIM-BCD Semiconductor Manufacturing Co., Ltd., Shenzhen Office
Unit A Room 1203, Skyworth Bldg., Gaoxin Ave.1.S., Nanshan District, Shenzhen,
China
Tel: +86-755-8826 7951
Fax: +86-755-8826 7865
Taiwan Office
BCD Semiconductor (Taiwan) Company Limited
4F, 298-1, Rui Guang Road, Nei-Hu District, Taipei,
Taiwan
Tel: +886-2-2656 2808
Fax: +886-2-2656 2806
USA Office
BCD Semiconductor Corp.
30920 Huntwood Ave. Hayward,
CA 94544, USA
Tel : +1-510-324-2988
Fax: +1-510-324-2788
- Headquarters
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No. 1600, Zi Xing Road, Shanghai ZiZhu Science-based Industrial Park, 200241, China
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