CX7508 Switch Datasheet

CX7508 Datasheet, PDF, Equivalent


Part Number

CX7508

Description

High Precision CC/CV Primary-Side PWM Power Switch

Manufacture

CXW

Total Page 8 Pages
Datasheet
Download CX7508 Datasheet


CX7508
CX7508
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL DESCRIPTION
CX7508 is a high performance offline PWM power
switch for low power AC/DC charger and adapter
applications.It operates in primary-side sensing
and regulation.Consequently, opto-coupler and
TL431 could be eliminated. High Precision
Constant Voltage (CV) and Constant Current (CC)
control are integrated as shown in the figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor Rs
at CS pin. In CV control, multi-mode operations are
utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in Cable Drop Compensation.
Device operates in PFM in CC mode as well at
large load condition and it operates in PWM with
frequency reduction at light/medium load. The chip
consumes very low operation current, it can
achieve less than 75mW standby power.
CX7508 offers comprehensive protection coverage
with auto-recovery features including
Cycle-by-Cycle current limiting, VDD Over Voltage
Protection (VDD OVP), short circuit protection,
built-in leading edge blanking, VDD under voltage
lockout (UVLO), OTP, etc.
High precision constant voltage (CV) and constant
current (CC) can be achieved by CX7508.
CX7508 is offered in DIP7 package.
FEATURES
± 5% Constant Voltage Regulation and
Current Regulation at Universal AC Input
Primary Side Regulation (PSR) Without TL431
and Opto-coupler
No Need for Control Loop Compensation
Programmable CV and CC Regulation
Multi-Mode PWM/PFM Operation
Output Short Load Protection
Less than 75mW Standby Power
Built-in Line Voltage and Primary Winding
Inductance Compensation
Built-in Adaptive Current Peak Regulation
Programmable Cable Drop Compensation
Audio Noise Free Operation
Built-in Over Temperature Protection (OTP)
Soft Gate Driver for Good EMI Performance
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with Hysteresis
(UVLO)
VDD OVP & Clamp
APPLICATIONS
Low Power AC/DC offline SMPS for
Cell Phone Charger
Digital Camera Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
TYPICAL APPLICATION
SHENZHEN CHENGXINGWEI TECHNOLOGY CO.LTD
1

CX7508
CX7508
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map of DIP7 package is shown as
below.
Ordering Information
Part Number
Description
CX7508
DIP7, Rohs, 50Pcs/Tube
Package Dissipation Rating
Package
DIP7
RJA (/W)
75
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3 to 650V
VDD Zener Clamp Voltage
VDD_Clamp
VDD Clamp
Current
Continuous 10 mA
CS Input Voltage
-0.3 to 7V
INV Input Voltage
-0.3 to 7V
Maximum Operating Junction
Temperature TJ
150 oC
Min/Max Storage Temperature
Tstg
-55 to 150 oC
Lead Temperature (Soldering,
10secs)
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, 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-rated conditions for extended periods
may affect device reliability.
SHENZHEN CHENGXINGWEI TECHNOLOGY CO.LTD
2


Features CX7508 High Precision CC/CV Primary-Side PWM Power Switch GENERAL DESCRIPTION CX7508 is a high performance offline PW M power switch for low power AC/DC char ger and adapter applications.It operate s in primary-side sensing and regulatio n.Consequently, opto-coupler and TL431 could be eliminated. High Precision Con stant Voltage (CV) and Constant Current (CC) control are integrated as shown i n the figure below. In CC control, the current and output power setting can be adjusted externally by the sense resis tor Rs at CS pin. In CV control, multi- mode operations are utilized to achieve high performance and high efficiency. In addition, good load regulation is ac hieved by the built-in Cable Drop Compe nsation. Device operates in PFM in CC m ode as well at large load condition and it operates in PWM with frequency redu ction at light/medium load. The chip co nsumes very low operation current, it c an achieve less than 75mW standby power . CX7508 offers comprehensive protection coverage with auto-rec.
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