Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
AP3766
General Description
The AP3766 is a high performance AC/DC power sup-
ply controller for battery charger and adapter applica-
tions. The device uses Pulse Frequency Modulation
(PFM) method to build discontinuous conduction
mode (DCM) flyback power supplies.
The AP3766 provides accurate constant voltage, con-
stant current (CV/CC) regulation while removing the
opto-coupler and secondary control circuitry. It also
eliminates the need of loop compensation circuitry
while maintaining stability. The AP3766 achieves
excellent regulation and high average efficiency, yet
meets the requirement for no-load consumption less
than 30mW.
The AP3766 is available in SOT-23-6 package.
Features
·
·
·
·
·
·
·
·
·
·
·
·
Primary Side Control for Rectangular Constant
Current and Constant Voltage Output
Sub-microampere Start-up Current
30mW No-load Input Power Feasible
Tight CC Regulation Performance
Eliminates Opto-coupler and Secondary CV/CC
Control Circuitry
Eliminates Control Loop Compensation Circuitry
Flyback Topology in DCM Operation
Random Frequency Modulation to Reduce
System EMI
Built-in Soft Start
Open Feedback Protection
Short Circuit Protection
SOT-23-6 Package
Applications
·
·
·
Adapters/Chargers for Cell/Cordless Phones,
PDAs, MP3 and Other Portable Apparatus
LED Drivers
Standby and Auxiliary Power Supplies
SOT-23-6
Figure 1. Package Type of AP3766
Feb. 2010 Rev. 1. 0
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
AP3766
Pin Configuration
K6 Package
(SOT-23-6)
Pin 1 Dot by Marking
OUT
GND
VCC
1
2
3
6
5
4
FB
GND
CS
Figure 2. Pin Configuration of AP3766 (Top View)
Pin Description
Pin Number
1
2, 5
3
4
6
Pin Name
OUT
GND
VCC
CS
FB
Function
This pin drives the base of external power NPN switch
Ground
Supply voltage
The primary current sense
The voltage feedback from the auxiliary winding
Feb. 2010 Rev. 1. 0
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
AP3766
Functional Block Diagram
VCC
3
FB
6
0.1V
COMP
pfm
Tonsec
Detector
Tons
Regulator
&
Bias
UVLO
EA
4.0V
OCkP
CV_ctrl
pfm
Constant Voltage Control
R
S
Q
Driver
1
OUT
CS
4
Peak Current Control & LEB
Tons
Constant Current Control
R
Q
CC_ctrl
2, 5
GND
S
Figure 3. Functional Block Diagram of AP3766
Feb. 2010 Rev. 1. 0
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
AP3766
Ordering Information
AP3766
Circuit Type
Package
K6: SOT-23-6
-
G1: Green
TR: Tape and Reel
Package
SOT-23-6
Temperature Range
-40 to 85
o
C
Part Number
AP3766K6TR-G1
GBF
Marking ID
Packing Type
Tape & Reel
BCD Semiconductor's products, as designated with "G1" suffix in the part number, are RoHS compliant and Green.
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage VCC
Voltage at CS, OUT to GND
FB Input
Output Current at OUT
Operating Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10s)
Thermal Resistance Junction-to-Ambient
ESD (Machine Model)
ESD (Human Body Model)
Value
-0.3 to 36
-0.3 to 7
-40 to 10
Internally limited
150
-65 to 150
300
250
200
2000
o
Unit
V
V
V
A
o
C
o
o
C
C
C/W
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.
Feb. 2010 Rev. 1. 0
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BCD Semiconductor Manufacturing Limited
Preliminary Datasheet
LOW-POWER OFF-LINE PRIMARY SIDE REGULATION CONTROLLER
AP3766
Electrical Characteristics
(V
CC
=15V, T
A
=25
o
C, unless otherwise specified.)
Parameter
UVLO SECTION
Start-up Threshold
Minimal Operating Voltage
STANDBY CURRENT SECTION
Start-up Current
Operating Current
DRIVE OUTPUT SECTION
OUT Maximum Current
Sink
Source
I
OUT
50
24
30
36
mA
I
ST
I
CC(OPR)
V
CC
= V
TH (ST)
-0.5V,
Before start-up
Static
200
0.6
320
µA
µA
V
TH (ST)
V
OPR
(min)
16
7.2
18.5
9
21
10.2
V
V
Symbol
Conditions
Min
Typ
Max
Unit
CURRENT SENSE SECTION
Current Sense Threshold
Pre-Current Sense
Leading Edge Blanking
FEEDBACK INPUT SECTION
Feedback
Current
Pin
Input
Leakage
I
FB
V
FB
V
FB
=4V
2.0
3.59
2.5
3.83
3.1
4.07
µA
V
V
CS
V
CS(PRE)
455
365
510
410
750
545
455
mV
mV
ns
Feedback Threshold
Feb. 2010 Rev. 1. 0
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BCD Semiconductor Manufacturing Limited
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