A Product Line of
Diodes Incorporated
AP3776
LOW POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
Description Pin Assignments
The AP3776 is a high performance AC/DC power supply controller for
battery charger and adapter applications. It can meet less than 10mW
standby power for Super Star charger criteria. The device uses (Top View)
Pulse Frequency Modulation (PFM) method to build discontinuous
conduction mode (DCM) flyback power supplies.
1 8
IS FB
The AP3776 provides accurate constant voltage (CV), constant
7
EM 2 CPC
current (CC) and outstanding dynamic performance without requiring
an opto-coupler. It also eliminates the need of loop compensation
VCC 3 6 VCS
circuitry while maintaining stability.
5 GND
OUT 4
The AP3776 achieves excellent regulation and high average
efficiency, less than 10mW no-load power consumption and less than
1s startup time. When AP3776 is used with AP4341, APR343 or
SO-8
APR3415, good under-shoot performance and higher conversion
efficiency can be achieved.
This IC is available SO-8 package.
Features
Applications
Primary Side Control for Eliminating Opto-coupler Adapter/Chargers for Shaver, Cell/Cordless Phones, PDAs, MP3
and Other Portable Apparatus
10mW No-load Input Power
Standby and Auxiliary Power Supplies
Compensation for External Component Temperature Variations
Flyback Topology in DCM Operation
Random Frequency Adjustment to Reduce System EMI
Semi-valley Turn on for the Higher Efficiency
Built-in Soft Start
Over Voltage Protection
Over Temperature Protection
Short Circuit Protection
AP4341, APR343 or APR3415 Awaking Signal Detection
Audio Noise Reduction
Internal Cable Compensation
SO-8 Package
Totally Lead-free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. Green Device (Note 3)
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
A Product Line of
Diodes Incorporated
AP3776
Typical Applications Circuit
TR1
FR1 L1
D1
C4 R8
NTC
R13 R24 R26
D2,D4,
+ +
D5,D6
C11 C12
C21
D7 C22
+ + OUT VCC
R12 GND
R15
IC2
AP4341
V
O
L2
D8
R9
C3
Q1
IC1
R10
AP3776
D3
VCC
VCS R4
OUT
CPC
R7
FB
C9
EM
GND
IS
R1
R3
R2
R5 R6
Typical Application of AP3776 with AP4341 (V =5V/1A or 2A)
OUT
FR1 L1
T1
C4 R8
NTC
R13
D2,D4,
C24
R23 + +
D5,D6
C11
C12
C20 C23
D7
+ +
R12
R15
Q2
R21
L2 C22
D8
R9
C3
IC2
Q1
IC1 R20
R10
AP3776
D3
VCC APR343
R4
VCS
OUT
CPC
R7
FB R22
C9
EM
GND C21
IS
R1
R2 R3
R5 R6
CY1
Typical Application of AP3776 with APR343 (V =5V/2A or 2.4A)
OUT
2 of 17
AP3776 February 2015
Diodes Incorporated
www.diodes.com
Document number: DS36707 Rev. 4 - 2
NEW PRODUCT
DRISR VDET
GND
VCC AREF