Document
AP3783
PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER
Description
Pin Assignments
The AP3783 is a high performance AC/DC power supply controller for battery charger and adapter applications. The controller regulates the output voltage and current in the primary side by piece-wise Pulse Frequency Modulation (p-PFM) in discontinuous conduction mode (DCM).
(Top View)
Pin 1 Mark
The AP3783 provides accurate constant voltage (CV), constant current (CC) and outstanding dynamic performance without requiring an opto-coupler. It also eliminates the need of loop compensation circuitry while maintaining stability.
The AP3783 provides valley turn-on function, operating frequency Jitter function (about 5.5% frequency change every 256μs) from light to full load range and 3-segment drive current to improve the power supply EMI performance. The AP3783 also has built-in fixed cable voltage drop compensation (10%, 7% and 4% of nominal system output voltage to meet various cables with different length and gauge) and adjustable line voltage compensation.
The AP3783 is packaged in SOT26.
Applications
Adapters/Chargers LED Lighting Standby and Auxiliary Power Supplies
CS 1 GND 2 VCC 3
6 CPC 5 DRI 4 FB
SOT26
Features
Less than 75mW Standby Power Consumption Meet Efficiency Requirement of COC Trier2 Valley Turn-on to Reduce Switching Loss and Improve EMI Piece-wise Frequency Reduction to Enhance Conversion
Efficiency and Suppress Audio Noise Over Voltage Protection (OVP) Over Temperature Protection (OTP) Short Circuit Protection (SCP) with Hiccup 3-Segment Drive Current for Radiative EMI Suppression Operating Frequency Jitter Function for Conductive EMI
Suppression Drive MOSFET for 5W to 30W Battery Charger/Adapter
Applications SOT26 SMD Package Comply with Level 3 of IPC/JEDEC J-STD-
033A 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 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. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP3783
Document number: DS37429 Rev. 6 - 2
1 of 17 www.diodes.com
December 2015
© Diodes Incorporated
Typical Applications Circuit
AP3783
FR1
DIN
LIN
RST1
C1
R1
+ CIN1
+
CIN2
RST2
D1 R0
Da +
CVCC
Ra
C2 R2 T1 Ds
Np Ns
++ COUT1 COUT2
R DUMMY
12V/1.5A 5V/2A
Na
1 CS
U1 CCPC
CPC 6
2 GND
DRI 5
Dg
3 VCC
FB 4
Rg
AP3783
Q1
RCS
RFB1
CY1
RFB2
Pin Descriptions
Pin Number 1 2 3 4 5
6
Pin Name CS GND VCC FB DRI
CPC
Function
The CS is the current sense pin of the IC. The IC will turn off the power MOSFET according to the voltage on the CS pin
The ground of the controller The VCC pin supplies the power for the IC. In order to get the correct operation of the IC, a capacitor with low ESR should be placed as close as possible to the VCC pin The CV and CC regulation are realized based on the voltage sampling of this pin
Output pin to drive external MOSFET
A capacitor about 50nF should be connected to this pin. The voltage of CPC pin is linear to load of the system and it is used for the functions of cable voltage drop compensation and audio noise suppression
AP3783
Document number: DS37429 Rev. 6 - 2
2 of 17 www.diodes.com
December 2015
© Diodes Incorporated
Functional Block Diagram
AP3783
0.05V
4 FB
COMP
OVP OCkp Output short OTP
PFM
OSC tOSC
tONS Detector
tONS
Pro
VCC 3
Regulator &
Bias
UV UV
Dynamic Response Dyn
VLOAD
VFB_REF
Constant Voltage Control Cable compensation
VLOAD
Line Comp.
1 CS
tONS
VCS_D/L/M/H
Peak Current Control LEB
Frequency Dither VCSN Select
VLOAD UV Detect ON
Constant Current Control
VCS_D/L/M/H
CPC VLOAD
6 CPC
CV_ctrl
RQ S
Detect ON
Detect pulse
tOSC
Shutdown Pre_Shutdown
RQ S
CC_CTRL
UVLO
2 GND
PFM
Valley ON
5
Driver
DRI
AP3783
Document number: DS37429 Rev. 6 - 2
3 of 17 www.diodes.com
December 2015
© Diodes Incorporated
AP3783
Absolute Maximum Ratings (Note 4)
Symbol VCC
VCS, VCPC VFB
ISOURCE TJ
TSTG TLEAD
θJA
ESD
Parameter Supply Voltage Voltage on CS, CPC Pin FB Input Voltage Source Current from OUT Pin Operating Junction Temperature Storage Temperature Lead Temperature (Soldering, 10 sec) Thermal Resistance (Junction to Ambient) ESD (Human Body Model) ESD (Charged Device Model)
Rating -0.3 to 35 -0.3 to 7 -0.4 to 10 Internally Limited -40 to +150 -65 to +150
+300 200 6000 400
Unit V V V A °C °C °C
°C/W V V
Note 4: 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 .