SCM1725ASA

Mornsun
Non-isolated 650V flyback controller with ultra-low consumption (less than 20?A in turn-off mode).
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SCM1725A Control Chip for the Power Supply of Cost Control Switch Features              Packaging Built-in 650V power MOSFET Built-in VDD quick start function Frequency Reduction at Light Load and Burst Mode Control under no load The maximum operating frequency of the chip is fixed at 122kHz, and provided with built-in frequency jitter function Built-in slope compensation Current limit per cycle Current mode control Built-in soft start function VDD Over-Voltage Protection (OVP) VDD Under-Voltage Lockout (UVLO) Open-loop and output short-circuit protection Chip power consumption is less than 20μA in turn-off mode Peak power up to 20W Mechanical package: SOP-7, (see “Ordering Information” for details). Application   Control system for cost control switch ACDC non-isolated power supply Functional Description SCM1725A is a high-performance current-mode PWM control chip, which is built-in a 2A power MOSFET with minimum drain voltage up to 650V. The chip's high voltage start pin is connected directly to the power bus voltage to realize the fast charging of VDD by-pass capacitor. In addition, after the chip is provided with short circuit protection, the VDD capacitor voltage drops to the undervoltage point of VDD, and the high voltage fast start circuit is restarted to charge the VDD by-pass capacitor until VDD start voltage is reached, then the start circuit stops working and the chip’s power consumption remains relatively low. With built-in light-load frequency hopping mode, the chip has good efficiency performance under light load. Furthermore, designed with the built-in duty cycle slope compensation, internal loop compensation circuit, etc, the chip can provide more stable system loop operation. The chip also integrates a series of protection functions to improve system reliability. In addition, the chip integrates EN pins and when externally connected to the logic high-level control chip, can enable the ultra-low power mode, with the voltage of VDD pin controlled around 8.6V. When the IC have sufficient heat dissipation conditions,the maximum output peak power is up to 20W when the intermittent opration is performed at an open temperature of 75 ℃ for 3S on and 3S off. Function Curve 2021.12.28-A/3 Page 1 of 9 MORNSUN Guangzhou Science & Technology Co.,Ltd.reserves the copyright and right of final interpretation PDF
Документация на SCM1725ASA 

SCM1725A-EN SCM1725A Control Chip for the Power Supply of Cost Control Switch

Дата модификации: 27.12.2021

Размер: 1.19 Мб

9 стр.

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    SCM1101AMA (MORNSUN)