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AP438/9
PWM Fan Speed Controller Features
- Built-in 30Khz OSC provide 0%~100% PWM output - Over Temperature Protector(OTP) flag.
(AP439 only).
- Open collect output(OTP & PWM pins).
- SIP-4L package for AP438.
- SIP-5L, SOP-8L package for AP439.
General Descriptions
The AP438/9 series’s PWM output has built-in
NPN power
transistor that controls the Fan current & Fan speed.
AP439 built-in over temperature alarm flag.
Applications
- PC Power.
- DC Fan
Pin Assignment
Front View AP438
Pin Descriptions
Name VCC VIN OTP PWM GND Description Operating voltage input Reference input voltage Over Temperature protect flag.
PWM Open Collect Output.
Ground
OTP 1 VCC 2 ...