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CR6235 Datasheet Preview

CR6235 Datasheet

High Precision CC/CV Primary-Side PWM Power Switch

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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




Chip Rail

CR6235 Datasheet Preview

CR6235 Datasheet

High Precision CC/CV Primary-Side PWM Power Switch

No Preview Available !

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


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