Preliminary Datasheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
General Description
The AP3103 is a low startup current, current mode
PWM controller with green-mode power-saving opera-
tion. The PWM switching frequency at normal opera-
tion is externally programmable and is trimmed to a
tigh range. The dithering of frequency will improve
EMI feature. When the load decreases, the frequency
will reduce and when at a very low load, the IC will
enter the
‘skip
mode’ to minimize switching loss.
About 20kHZ frequency switching is aviode the audi-
ble noise as well as reduding the standby loss.
The AP3103 features a lot of functions such as the
Leading-Edge Blanking (LEB) of the current sensing,
internal slope compensation and several protection
functions including cycle-by-cycle current limit
(OCP), VCC Over Voltage Protection (VOVP), OTP,
OLP protection.
AP3103
Features
·
·
·
·
·
·
·
·
·
Bi-CMOS Process with Excellent Performance
Very Low Start-up Current:(< 15µA)
Current Mode Control
Non-audible-noise Green-mode Control
LEB (Leading-edge Blanking) on CS Pin
Internal Slope Compensation
Frequency Fold Back for High Average Effi-
ciency
Soft Switching for Reducing EMI
Useful Pin Fault Protection:
CS Pin Floating
RI Pin Short to Ground
RI Pin Floating
FB/Opt-coupler Open/short
Comprehensive System Protection Feature:
VCC Over Voltage Protection (VOVP)
Over Temperature Protection (OTP)
Over Load Protection (OLP)
Mini Size with Packages
·
This IC is available in SOT-23-6 and DIP-8 packages.
·
Applications
·
·
·
·
Switching AC-DC Adapter/Charger
ATX/BTX Auxiliary Power
Set-top Box(STB) Power Supply
Open Frame Switching Power Supply
SOT-23-6
DIP-8
Figure 1. Package Types of AP3103
Feb. 2010 Rev. 1. 0
1
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
Pin Configuration
AP3103
K Package
(SOT-23-6)
Pin 1 Dot by Marking
P Package
(DIP-8)
GATE
1
2
3
4
8
7
6
5
GND
FB
NC
RI
GND
FB
RI
1
2
3
6
5
4
GATE
VCC
VCC
NC
SENSE
SENSE
Figure 2. Pin Configuration of AP3103 (Top View)
Pin Description
Pin Number
SOT-23-6
1
2
3
4
5
6
DIP-8
8
7
5
4
2
1
3, 6
Pin Name
GND
FB (COMP)
RI
SENSE
VCC
GATE
NC
Function
Signal ground. Current return for driver and control circuits
Feedback. Directly connected to the opto-coupler
Set the bias current to determine the normal switching frequency
Current Sense
Supply voltage of driver and control circuits
Gate driver output
No connection. These pins are not internally connected
Feb. 2010 Rev. 1. 0
2
BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
VERSATILE COST EFFECTIVE GREEN PWM CONTROLLER
Absolute Maximum Ratings (Note 1)
Parameter
Power Supply Voltage
Gate Output Current
Input Voltage to FB, SENSE pin
Thermal Resistance Junction to Ambient
Power Dissipation and Thermal Charac-
teristic, SENSE at T
A
<25
o
C
Operating Junction Temperature
Storage Temperature Range
ESD (Human Body Model)
ESD (Machine Model)
Symbol
V
CC
I
O
V
FB,
V
SENSE
SOT-23-6
DIP-8
SOT-23-6
DIP-8
-40 to150
150
3000
300
Value
30
Unit
V
mA
V
250
100
500
1250
o
AP3103
3
00
-0.3 to 7
θ
JA
P
D
T
J
T
STG
C/W
mW
o
C
o
C
V
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
Supply Voltage
Ambient Operating Temperature Range
Symbol
V
CC
T
A
Min
10
-40
Max
25
85
Unit
V
o
C
Feb. 2010 Rev. 1. 0
5
BCD Semiconductor Manufacturing Limited
Embedded System
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