Preliminary Datasheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
General Description
The AP3710 is a green-mode PWM controller, its main
applications are low power supplies such as offline
battery chargers, adapters, STB and other auxiliary
supplies, where the needs for low no load power, low
total cost and high reliability are all required.
The functional blocks of AP3710 include: under volt-
age lockout with low start-up current; precise voltage
reference for internal comparators; PWM comparator
with current limit control, feedback signal and band-
gap input; short circuit comparator and open circuit
protection for opto-coupler.
The AP3710 operates at a fixed 60kHz switching fre-
quency, its output connects to the emitter of high volt-
age NPN transistor or the source of MOSFET. In
normal mode, it works as a switch to turn on or turn off
the external transistor. In failure modes like open loop,
over voltage or overload due to short circuit, the chip
enters into an auto restart mode controlled by the inter-
nal protection unit.
The AP3710 is available in SOIC-8 and DIP-8 pack-
ages.
AP3710
Features
·
·
·
·
·
·
·
·
·
·
·
·
·
Current Mode Control with Skip Cycle Capability
Low Start-up Current: 0.25 mA
Low Operating Current: 0.45mA
Output Current Capacity: 900 mA
Fixed Switching Frequency: 60 kHz
Frequency Dithering for Low EMI
Under-Voltage Lockout with Hysteresis
Built-in Slope Compensation
Short Circuit Protection
Open and Short Circuit Protection for Opto-
Coupler
Maximum Input Power is 0.2W under No Load
Maximum Input Power is 1W under 0.5W Load
Low Total Cost Solution
Applications
·
·
·
·
·
Adapters
Battery Chargers
Set Top Boxes
Auxiliary Supplies
DVD
SOIC-8
DIP-8
Figure 1. Package Types of AP3710
Nov. 2007 Rev. 1. 2
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
Pin Configuration
M/P Package
(SOIC-8/DIP-8)
GND
VCC
NC
OUT
1
2
3
4
8
7
6
5
NC
VA
NC
VSEN
AP3710
Figure 2. Pin Configuration of AP3710 (Top View)
Pin Description
Pin Number
1
2
3, 6, 8
4
5
7
Pin Name
GND
VCC
NC
OUT
VSEN
VA
Power supply ground
The power supply of the IC and this terminal is also used for the feedback control
Not connected
The PWM output is directly connected to the emitter of NPN transistor or the source
of MOSFET
It is used for line voltage compensation, and PWM uses this to terminate the output
switch conduction
It is used for short circuit protection, and this terminal will be pulled down to low
level when short circuit happens at the load side
Function
Nov. 2007 Rev. 1. 2
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
Ordering Information
AP3710
Circuit Type
Package
M: SOIC-8
P: DIP-8
-
E1: Lead Free
TR: Tape and Reel
Blank: Tube
AP3710
Package
SOIC-8
DIP-8
Switching Frequency
60kHz
60kHz
Temperature Range
-40 to 85
o
C
-40 to 85
o
C
Part Number
AP3710M-E1
AP3710MTR-E1
AP3710P-E1
Marking ID
3710M-E1
3710M-E1
AP3710P-E1
Packing Type
Tube
Tape & Reel
Tube
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
Voltage at OUT
Analog Input at V
SEN
Output Current at OUT
Power Dissipation
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10s)
ESD (Machine Model)
Value
-0.3 to 6.3
-0.3 to 40
-0.3 to 6.3
Internally limited
0.6
150
-65 to 150
300
300
Unit
V
V
V
A
W
o
C
o
C
o
C
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 Maximum Ratings" for extended periods
may affect device reliability.
Nov. 2007 Rev. 1. 2
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
Electrical Characteristics
(V
CC
=4V, T
J
=25
o
C, unless otherwise specified.)
Parameter
UVLO SECTION
Turn on Threshold Voltage
Turn off Threshold Voltage
Discharge Voltage
V
CC
(on)
V
CC
(off)
V
DIS
5.30
3.4
2.7
5.60
3.65
2.9
5.90
3.90
3.1
V
V
V
Symbol
Conditions
Min
Typ
Max
Unit
AP3710
STANDBY CURRENT SECTION
Start-up Current
Operating Current
V
CC
Zener Voltage
Dynamic Impedance
INTERNAL OSCILLATOR
Switching Frequency
Frequency Dithering
Temperature Stability
DRIVE OUTPUT SECTION
OUT Turn-on Voltage
OUT Turn-off Voltage
Rise Time
Fall Time
Maximum Duty Cycle
Minimum Duty Cycle
Driver OUT On-Resistance
Switch Off Current (OUT)
Effective Current Limit
OUT Current Coefficient
CURRENT SECTION
Maximum Input Signal
V
SEN
0.9
1.0
1.1
V
I
LIM
G
A
R
OUT
V
OUT
(on)
V
OUT
(off)
T
R
T
F
D
MAX
C
L
=1nF, 15Ω pull-up
C
L
=1nF, 15Ω pull-up
V
CC
(off) + 0.2V
V
CC
=V
CC
(on)-0.2V
I
OUT
=0.7A
Driver off, V
OUT
=10V
V
CC
=V
CC
(off)+0.5V
800
68
7.6
5.7
9.3
6.8
60
30
75
3
3
20
900
-0.6
82
5
5
40
Ω
µA
mA
A/V
%
11
7.9
V
V
ns
-40 to 85
o
C
F
SW
(Note 3)
50
60
70
kHz
kHz
%
I
ST
I
CC
(opr)
V
Z
R
VCC
I
CC
=10mA
V
CC
=3.8 to 4.8V (Note 2)
6.5
10
V
CC
=4V
0.25
0.45
7
18
0.4
0.7
7.5
30
V
kΩ
mA
±
2
±
3.5
5
±
5
Note 2: Guaranteed by design, not tested in production.
Note 3: The fixed oscillation frequency, the frequency jittering is not included.
Nov. 2007 Rev. 1. 2
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BCD Semiconductor Manufacturing Limited
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