KA7553A

PWM（脉冲宽度调制）控制器，Fairchild Semiconductor### 离线和隔离直流-直流控制器，Fairchild Semiconductor回扫控制器、线路电平控制 LLC 控制器和初级侧调节控制器显著节能，以满足开关模式电源 SMPS 设计的需要。 所有控制器随附集成软启动和过压、开口反馈、过载、输出短路、过电流、电压中断和欠压闭锁功能。

Description

The KA7552A/ are switching power control IC for wide operating frequency range. The internal circuits include pulse by pulse current limiting, protection, on/off control by external trigger, low standby current, soft start, and high current totempole output for driving a POWER

MOSFET. Maximum duty of the KA7552A is 70% and the KA7553A is 46%. When duty is maximum, the input threshold voltage of pin2 & pin8 are not same in KA7552A and KA7553A.

Features

• Built-in drive circuits for direct connection power MOSFET lO = ±1.5A

• Wide operating frequency range 5kHz ~ 600kHz

• Pulse by pulse over current limiting

• Over load protection

• On/off control by external trigger

• Internal UVLO

• Low standby current typ. 90uA

• Soft start circuit