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NEWS

启达电源ICCR634X-5/7/8/9 High Precision CC/CV PSR PWM Swi

时间:2019-05-31 16:16
FEATURES
 Standby power less than 75mW
 Primary-side Sensing and Regulation
Without TL431 and Opto-coupler
 High precision constant voltage and
current regulation at Universal AC input
 Programmable CV and CC Regulation
 Multi-mode PWM/PFM operation for
efficiency improving
 Audio noise free operation
 Programmable Cable Drop
Compensation
 Built-in line voltage and primary winding
inductance compensation
 No need for control loop compensation
 VDD Over Voltage Protection
 VOUT Over Voltage Protection
 Built-in Short Circuit Protection
 Built-in Leading Edge Blanking (LEB)
 Over temperature protection(OTP)
 Cycle-by-Cycle Current Limiting
 VDD Under Voltage Lockout with
Hysteresis (UVLO)
 DIP-8L/SOP-7L green Package
APPLICATIONS
 Switching AC/DC Small Power Adaptor
 Cell Phone Charger
 Digital Cameras Charger
 Auxiliary Power for PC, TV etc
 Linear Regulator/RCC Replacement
GENERAL DESCRIPTION
CR6345 CR6347 CR6348 CR6349is a high performance offline PSR controller for low power AC/DC charger and
adapter applications, Less than 75mW standby power consumption with typical application. It
operates in primary-side sensing and regulation,so opto-coupler and TL431 could be eliminated.
In CC control, the current and output power can be adjusted externally by the sense resistor R S at
CS pin. In CV control, PFM operations is utilized to achieve high performance and high efficiency.
In addition, good load regulation is achieved by the built-in cable drop compensation.
CR6345 CR6347 CR6348 CR6349 offers comprehensive protection coverage with auto-recovery features including
Cycle-by-Cycle current limiting, VDD over voltage protection, VOUT over voltage protection,
short circuit protection, built-in leading edge blanking, VDD under voltage lockout (UVLO).
CR6345 CR6347 CR6348 CR6349
CR6345 CR6347 CR6348 CR6349
CR6345 CR6347 CR6348 CR6349
CR6345 CR6347 CR6348 CR6349

OPERATION DESCRIPTION
CR6345 CR6347 CR6348 CR6349 is a cost effective PSR power switch optimized for off-line low power AC/DC
applications including battery chargers. It operates in primary side sensing and regulation, thus
opto-coupler and TL431 are not required. Proprietary built-in CC/CV control can achieve high
precision CC/CV control to meet most charger application requirements.
CC/CV Operation
CR6345 CR6347 CR6348 CR6349 is designed to produce good CC/CV control. In charger applications, a discharged
battery charging starts in the CC portion of the curve until it is nearly full charged and smoothly
switches to operate in CV portion of the curve. The CC portion provides output current limiting.
In CV operation, the output voltage is regulated through the primary side control. In CC operation
mode, CR634X will regulate the output current constant regardless of the output voltage drop.
Principle of Operation
To support CR6345 CR6347 CR6348 CR6349 CC/CV control, system needs to be designed in DCM mode for flyback
system. In the DCM flyback converter, the output voltage can be sensed via the auxiliary winding.
During MOSFET turn-on time, the load current is supplied from the output filter capacitor. The
current in the primary winding ramps up. When MOSFET turns off, the energy stored in the
primary winding is transferred to the secondary side. The current in the secondary winding is

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