Document
NEW PRODUCT
AP3783R
PRIMARY SIDE REGULATED SWITCHING MODE POWER SUPPLY CONTROLLER
Description
Pin Assignments
The AP3783R is a high frequency, high efficiency and high accuracy switching mode power supply controller to drive power MOSFET for 5V/2A battery charger/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). The system operating frequency reduces linearly from heavy load to light load in each interval of the p-PFM, and enters constant current mode when the load current equals to the maximum system output current.
The AP3783R 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 AP3783R provides valley turn-on function and 3-Segment drive current to improve the power supply EMI performance. The AP3783R also has built-in fixed cable voltage drop compensation (8%, 4% and 2% of nominal system output voltage to meet various cables with different length and gauge) and adjustable line voltage compensation.
The AP3783R achieves excellent regulation and high average efficiency, less than 2s startup time for 30mW standby power solution. When AP3783R is used with APR3415, good undershoot and efficiency performances can be achieved.
The AP3783R is packaged in SOT26.
Applications
Adapters/Chargers Standby and Auxiliary Power Supplies
(Top View) Pin 1 Mark
CS 1 GND 2 VCC 3
6 CPC 5 DRI 4 FB
SOT26
Features
Less than 30mW 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 20W 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.
AP3783R
Document number: DS37448 Rev. 5 - 2
1 of 17 www.diodes.com
October 2015
© Diodes Incorporated
NEW PRODUCT
Typical Applications Circuit
AP3783R
FR1
DIN
LIN
RST1
C1
R1
+ CIN1
+
CIN2
RST2
D1 R0
Da +
CVCC
Ra
U1 CCPC
1 CS
CPC 6
2 GND 3 VCC
DRI 5 FB 4
AP3783R
Q1
RCS
T1
Np Ns C2 R2
COUT +
Na R4
RFB1 C4
U2 APR3415
DRAIN
GND
DRAIN
GND
VDET
VCC
DRISR AREF
R3
C3 R5
5V/2A
RFB2
CY1
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
AP3783R
Document number: DS37448 Rev. 5 - 2
2 of 17 www.diodes.com
October 2015
© Diodes Incorporated
NEW PRODUCT
Functional Block Diagram
AP3783R
VCC
CS
0.83V
4
FB
COMP
OVP/SCP/OTP/ OCkP/Max tONP
PFM tDELAY
tONS Detector
tONS tOFF
Dynamic Response
Timer
Pro tDELAY
t 256ms
Dyn
UV/OV
UV/OV
3
Regulator &
Bias
UVLO 2
GND
PFM
VFB_REF
EA
Constant Voltage Control
LL Mode RQ S
CV_CTRL
Valley _on
5
Driver
DRI
Line
VLINE
Compensation
VCS_X VLOAD
VCS_X Select UV Detect_on
1
CS
VCS_REF
Peak Current Control & LEB
tONS Constant Current Control
Vload
VCS_X
Low Pass Filter
VCPC
Cable Compensation
6
CPC
Shutdown
CC_CTRL
RQ
S
t 256ms
Light Load LL Mode Detection
AP3783R
Document number: DS37448 Rev. 5 - 2
3 of 17 www.diodes.com
October 2015
© Diodes Incorporated
AP3783R
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 Temper.