A Product Line of
Diodes Incorporated
AP3965/66/71
PRIMARY SIDE POWER SWITCHER FOR FLYBACK/NON-ISOLATED BUCK SMPS
Description Pin Assignments
The AP3965/66/71 consists of a primary side regulation controller and
M Package
a high voltage transistor, and is specially designed for off-line power
(SO7)
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. CPC 1 7
GND
The AP3965/66/71 operates at pulse frequency modulation (PFM), 2
FB
and provides accurate constant voltage, constant current (CV/CC)
VCC C
3 6
regulation without requiring an opto-coupler and secondary control
circuitry. It has internal cable compensation function for tight constant
5 C
CS 4
voltage regulation.
For AP3965
The AP3965/66/71 solution has fewer component numbers, smaller
size, and lower total cost.
P7 Package
The AP3965 is packaged in SO7. The AP3966/71 is available in
(PDIP-7)
PDIP-7.
1 7
CPC GND
Features
FB 2
Primary Side Control for Eliminating Opto-coupler and
Secondary CV/CC Control Circuitry
3 6 C
VCC
Built-in NPN Transistor with 700V
CBO
Low Start-up Current: 0.2A (Typ)
4 5 C
CS
Internal Output Cable Voltage Drop Compensation
Random Frequency Modulation for Low EMI
For AP3966/71
Short Circuit Protection
Low Total Cost Solution
Applications
Output Power Range (Note 1):
AP3965 for 5W Adapter and 3W Buck
Adapters
AP3966 for 10W Adapter and 4.5W Buck
Set Top Boxes
AP3971 for 12W Adapter and 5W Buck
Auxiliary Supplies
Totally Lead-free & Fully RoHS Compliant (Note 2 & 3)
Appliances
Halogen and Antimony Free. Green Device (Note 4)
Notes: 1. Typical continuous power in a non-ventilated enclosed adapter measured at +50C ambient.
2. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
3. See
A Product Line of
Diodes Incorporated
AP3965/66/71
Typical Applications Circuit
Rf1
D1 to D4
C10
L-com
C11 R11
C12 C13 Vo+
C5
R6
+ + Np + +
D12
J1
C2
C1
R12
R10
AC 90- 264V
R3
D5
Ns
Vo-
D6
R5
T1
+
C3
Nfb
U1
VCC
C
R8
C8
CPC
GND
FB
CS
R7 R9
For AP3971 (12V/1A)
Item Function QTY Item Function QTY
C1,C2 10F/400V, electrolytic 2 U1 AP3971, PDIP-7 1
C3 4.7F/50V, electrolytic 1 Rf1 2A/250V, fuse 1
C5 1nF/250V, ceramic 1 R3 1
3.3M/0.25W
C8 0.1F, 0805 1 R5 3.9 , 0805 1
C10 1nF/250V , Y1 capacitor 1 R6 150k/0.25W 1
AC
C11 1nF, 0805 1 R7 0.62, 1206 1
C12, C13 470F/16V 2 R8 31k, 0805 1
D1 to D6 1N4007, rectifier diode 6 R9 13k, 0805 1
D12 MBR3100, schottky diode 1 R10 1
360, 0805
L-com EE10, 15mH, Common inductor 1 R11 27, 0805 1
T1 EE19 core, PC40, transformer 1 R12 1
1.2k, 0805
2 of 13 November 2013
AP3965/66/71
Diodes Incorporated
www.diodes.com
Document number: DS36531 Rev. 3 - 2