Document
Data Sheet
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
General Description
Features
AP3710
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 voltage lockout with low start-up current; precise voltage reference for internal comparators; PWM comparator with current limit control, feedback signal and bandgap input; short circuit comparator and open circuit protection for opto-coupler.
The AP3710 operates at a fixed 60kHz switching frequency, its output connects to the emitter of high voltage 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 internal protection unit.
The AP3710 is available in SOIC-8 and DIP-8 packages.
· Current Mode Control with Skip Cycle Capability · Low Start-up Current: 0.25mA · Low Operating Current: 0.45mA · Output Current Capacity: 900mA · Fixed Switching Frequency: 60kHz · 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
Jan. 2013 Rev. 1. 4
Figure 1. Package Types of AP3710
BCD Semiconductor Manufacturing Limited 1
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER Pin Configuration
Data Sheet AP3710
M Package (SOIC-8)
GND VCC
NC OUT
1 2 3 4
8 NC 7 VA 6 NC 5 VSEN
P Package (DIP-8)
GND VCC
NC OUT
1 2 3 4
8 NC 7 VA 6 NC 5 VSEN
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
Function
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
Jan. 2013 Rev. 1. 4
BCD Semiconductor Manufacturing Limited 2
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER Functional Block Diagram
Data Sheet AP3710
VCC 2
5
VSEN GND 1
UVLO COMPARATOR
VREF (1.2V)
-
+
BIAS
VREF (1.2V)
PWM COMPARATOR
+FB -
START-UP CURRENT SOURCE
PWM CONTROL
DISCHARGE COMPARATOR
VREF (1.2V)
_+
SLOP COMPENSATION
DISCHARGE LOGIC
OSCILLATOR DRIVER
4 OUT 7 VA
Figure 3. Functional Block Diagram of AP3710
Jan. 2013 Rev. 1. 4
BCD Semiconductor Manufacturing Limited 3
LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER Ordering Information
AP3710
-
Data Sheet AP3710
Circuit Type
Package M: SOIC-8 P: DIP-8
E1: Lead Free G1: Green
TR: Tape and Reel Blank: Tube
Package SOIC-8 DIP-8
Switching Frequency
60kHz
60kHz
Temperature Range
-40 to 85oC
-40 to 85oC
Part Number
Lead Free
Green
AP3710M-E1
AP3710M-G1
AP3710MTR-E1 AP3710MTR-G1
AP3710P-E1
AP3710P-G1
Marking ID
Lead Free
Green
3710M-E1
3710M-G1
3710M-E1
3710M-G1
AP3710P-E1 AP3710P-G1
Packing Type
Tube Tape & Reel
Tube
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with "G1" suffix are available in green packages.
Absolute Maximum Ratings (Note 1)
Parameter Supply Voltage Voltage at OUT Analog Input at VSEN Output Current at OUT Power Dissipation Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10s) ESD (Machine Model) ESD (Human Body Model)
Value -0.3 to 6.3 -0.3 to 40 -0.3 to 6.3 Internally limited
0.6 150 -65 to 150 300 250 3000
Unit V V V A W oC oC oC 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 Maximum Ratings" for extended periods may affect device reliability.
Jan. 2013 Rev. 1. 4
BCD Semiconductor Manufacturing Limited
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LOW POWER PWM CONTROLLER FOR OFF-LINE ADAPTER
Electrical Characteristics
VCC=4V, TJ=25oC, unless otherwise specified.
Parameter
Symbol
Conditions
UVLO SECTION
Turn on Threshold Voltage VCC (on)
Turn off Threshold Voltage VCC (off)
Discharge Voltage
VDIS
STANDBY CURRENT SECTION
Start-up Current Operating Current VCC Zener Voltage Dynamic Impedance INTE.