Document
A Product Line of Diodes Incorporated
AP3965/66/71
PRIMARY SIDE POWER SWITCHER FOR FLYBACK/NON-ISOLATED BUCK SMPS
Description
The AP3965/66/71 consists of a primary side regulation controller and a high voltage transistor, and is specially designed for off-line power supplies within 12W output power or non-isolated buck applications within 5W. Typical applications include adapter for ADSL, auxiliary supplies or open frame types for appliances.
The AP3965/66/71 operates at pulse frequency modulation (PFM), and provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and secondary control circuitry. It has internal cable compensation function for tight constant voltage regulation.
The AP3965/66/71 solution has fewer component numbers, smaller size, and lower total cost.
The AP3965 is packaged in SO7. The AP3966/71 is available in PDIP-7.
Features
• Primary Side Control for Eliminating Opto-coupler and Secondary CV/CC Control Circuitry
• Built-in NPN Transistor with 700VCBO • Low Start-up Current: 0.2µA (Typ) • Internal Output Cable Voltage Drop Compensation • Random Frequency Modulation for Low EMI • Short Circuit Protection • Low Total Cost Solution
• Output Power Range (Note 1):
AP3965 for 5W Adapter and 3W Buck AP3966 for 10W Adapter and 4.5W Buck AP3971 for 12W Adapter and 5W Buck • Totally Lead-free & Fully RoHS Compliant (Note 2 & 3) • Halogen and Antimony Free. “Green” Device (Note 4)
Pin Assignments
M Package (SO7)
CPC 1 FB 2
VCC 3 CS 4 For AP3965
7 GND
6C 5C
P7 Package (PDIP-7)
CPC 1
FB 2
7 GND
VCC 3
6C
CS 4
5C
For AP3966/71
Applications
• Adapters • Set Top Boxes • Auxiliary Supplies • Appliances
Notes:
1. Typical continuous power in a non-ventilated enclosed adapter measured at +50°C ambient. 2. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
3. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free.
4. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds.
AP3965/66/71
Document number: DS36531 Rev. 3 - 2
1 of 13 www.diodes.com
November 2013
© Diodes Incorporated
A Product Line of Diodes Incorporated
AP3965/66/71
Typical Applications Circuit
Rf1
J1 AC 90- 264V
D1 to D4 L-com
C10
C2 +
+C1 R3
C5
R6 R10
D5
D6 + C3
R5
C11 R11
Np D12
Ns T1 Nfb
C12 C13 ++
Vo+ R12
Vo-
U1 VCC C
C8 CPC GND CS FB
R7
R8 R9
For AP3971 (12V/1A)
Item C1,C2
C3 C5 C8 C10 C11 C12, C13 D1 to D6 D12 L-com T1
Function 10µF/400V, electrolytic 4.7µF/50V, electrolytic
1nF/250V, ceramic 0.1µF, 0805
1nF/250VAC, Y1 capacitor 1nF, 0805 470µF/16V
1N4007, rectifier diode MBR3100, schottky diode EE10, 15mH, Common inductor EE19 core, PC40, transformer
QTY 2 1 1 1 1 1 2 6 1 1 1
Item U1 Rf1 R3 R5 R6 R7 R8 R9 R10 R11 R12
Function AP3971, PDIP-7
2A/250V, fuse 3.3MΩ/0.25W 3.9Ω , 0805 150kΩ/0.25W 0.62Ω, 1206 31kΩ, 0805 13kΩ, 0805 360Ω, 0805
27Ω, 0805 1.2kΩ, 0805
QTY 1 1 1 1 1 1 1 1 1 1 1
AP3965/66/71
Document number: DS36531 Rev. 3 - 2
2 of 13 www.diodes.com
November 2013
© Diodes Incorporated
A Product Line of Diodes Incorporated
AP3965/66/71
Pin Descriptions
Pin Number 1 2 3 4
5, 6 7
Pin Name CPC FB VCC CS C GND
Function This pin connects a capacitor to GND for output cable compensation The voltage feedback from auxiliary winding This pin receives rectified voltage from the auxiliary winding of the transformer Current sense for primary side of transformer This pin is connected with an internal power BJT’s collector This pin is the signal reference ground
Functional Block Diagram
AP3965/66/71
Document number: DS36531 Rev. 3 - 2
3 of 13 www.diodes.com
November 2013
© Diodes Incorporated
A Product Line of Diodes Incorporated
AP3965/66/71
Absolute Maximum Ratings (Note 5)
Note:
Symbol VCC VFB VCBO
–
TJ TSTG TLEAD
– –
PD
Parameter Supply Voltage FB Input Voltage Collector-emitter Voltage
Collector DC Current
Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) ESD (Machine Model) ESD (Human Body Model)
Total Power Dissipation
Rating -0.3 to +22 -1 to +10
700 AP3965 AP3966 AP3971
150 -65 to +150
300 200 2000 AP3965 AP3966 AP3971
1.5 3.2 4
0.9 1.4 1.5
Unit V V V
A
°C °C °C V V
W
5. 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.
Recommended Operating Conditions
Symbol VCC TOP fMAX
Parameter Supply Voltage Operating Temperature Range Maximum Operating Frequency
Min Max Unit – 22 V -40 +85 °C – 60 kHz
Therma.