CR6235 Datasheet PDF - Chip Rail

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CR6235
Chip Rail

Part Number CR6235
Description High Precision CC/CV Primary-Side PWM Power Switch
Page 12 Pages


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CR623XCR6235/6236/6237/6238
High Precision CC/CV Primary-Side PWM Power Switch
Features
Up to 5% Precision for Constant
Voltage Regulation and Constant
Current Regulation at Universal AC
input
Primary-side Sensing and Regulation
Without TL431 and Opto-coupler
Flyback Topology In DCM Operation
Soft-start
Built-in Leading Edge Blanking (LEB)
Frequency Jitter to Reduce System EMI
Programmable CV and CC Regulation
Adjustable Constant Current and
Output Power Setting
Built-in Secondary Constant Current
Applications
Cell Phone /Digital Cameras Charger
Small Power Adaptor
General Description
CR623X is a high performance offline PWM
power switch for low power AC/DC charger
and adaptor applications. It operates in
primary-side sensing and provides constant
voltage (CV) and constant current (CC)
regulation without TL431 and opto-coupler.
A typical output CC/CV curve is shown as in
the Fig.1.
Fig.1. Typical CC/CV Curve
Control with Primary Side Feedback
Built-in Secondary Constant Voltage
Sampling Controller
Program Cable Drop Compensation
Rich Protections For System Reliability
including
VDD Under Voltage Lockout with
Hysteresis (UVLO)
Cycle-by-Cycle Current Limiting
and Peak Current Protection (OCP)
Over Temperature Protection (OTP)
VDD Over Voltage Protection (OVP)
VDD Clamp
Lead-free SOP-8L & DIP-8L
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
In CC mode, the current point and maximum
output power setting can be adjusted by the
sense resistor RS at CS pin. In CV mode,
CR623X captures the auxiliary flyback
signal at Pin INV and then regulates the
output voltage. IN this mode, multi-mode
operations are utilized to achieve high
performance and high efficiency. In addition,
built-in cable drop compensation further
enhances output accuracy.
CR623X offers power on soft-start control
and ensures safe operation with complete
protections against all the fault conditions.
Built-in protection circuitry includes
Cycle-by-Cycle current limiting, peak current
protection, OTPVDD OVP, VDD clamp and
UVLO. Excellent EMI performance is
achieved with frequency jitter and soft-drive.
V2.0
1/12



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CR623X
High Precision CC/CV Primary-Side PWM Power Switch
Pin Assignment SOP-8L & DIP-8L
Pin Description
Pin Num
1
2
Pin Name
VDD
COMP
3 INV
4 CS
5/6 DRAIN
7/8 GND
I/O Description
P Power Supply
I Loop Compensation for CV Stability
The voltage feedback from auxiliary winding. Connected
I
to resistor divider from auxiliary winding reflecting output
voltage. PWM duty cycle is determined by EA output
COMP and current sense signal at pin 4.
I Current sense input
O
HV MOSFET Drain Pin. The Drain pin is connected to the
primary lead of the transformer
P Ground
Typical Application
~
AC
NP NS
Vo
NAUX
VDD
GND
COMP GND
INV DRAIN
CS DRAIN
CR623X
V2.0
2/12



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CR623X
Block Diagram
High Precision CC/CV Primary-Side PWM Power Switch
Simplified Internal Circuit Architecture
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3V to Bvdss
VDD Voltage
-0.3 to VDD_clamp
VDD Zener Clamp Continuous Current
10 mA
COMP Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
INV Input Voltage
-0.3 to 7V
Min/Max Operating Junction Temperature TJ
Min/Max Storage Temperature Tstg
Lead Temperature (Soldering, 10secs)
-20 to 150
-55 to 150
260
Note: Stress beyond those listed under “absolute maximum ratings” may cause permanent damage to the
device. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.
Output Power Table
Product
Package
230VAC ±15%
Adapter1
85-265VAC
Adapter 1
CR6235
SOP-8L
6W
5W
CR6236
DIP-8L
8W
7W
CR6237
DIP-8L
9W
8W
CR6238
DIP-8L
15W
13W
Notes:
1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink,
at 50ambient.
V2.0
3/12



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CR623X
High Precision CC/CV Primary-Side PWM Power Switch
Electrical Characteristics
(Ta=25°C unless otherwise noted, VDD = 16V)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
IDD_ST
Standby current
VDD=13V
Min Typ Max
5 20
IDD_OP
Operation Current
Operation
supply
current INV=2V,CS=0V,
VDD=20V
2.5 3.5
Unit
uA
mA
UVLO(ON)
VDD Under Voltage Lockout
Enter
VDD falling
7.5 8.5 10
V
UVLO(OFF)
VDD Under Voltage Lockout
Exit
VDD rising
13.5 14.5 16.0
V
OVP
Over voltage
voltage
protection Ramp up VDD until
gate clock is off
27.5
29.5
31.5
VDD_clamp
Maximum VDD opertation
voltage
IDD=10mA
Current Sense Input Section
TLEB
Vth_oc
Td_oc
ZSENSE_IN
T_ss
CV Section
LEB time
Over current threshold
OCP Propagation delay
Input Impedance
Soft start time
30.5 32.5 34.5
540
870 900 930
150
50
10
Freq_Nom
System Nominal switch
frequency
Freq_startup
f/Freq
Frequency jitter range
Error Amplifier section
Vref_EA
Reference voltage for EA
Gdc DC gain of the EA
INV=0V,Comp=5V
I_COMP_MAX
Max. Cable compensation
current
INV=2V,COMP=0V
60
14
±4
1.97 2 2.03
60
42
V
V
ns
mV
ns
Kohm
ms
KHZ
%
V
dB
uA
V2.0
4/12



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