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PUCC3801P Datasheet

  • PUCC3801P

  • Current-mode PWM controller

  • 16頁

  • PHILIPS

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PUCC3801
Current-mode PWM controller
Rev. 01 鈥?10 September 2001
Product data
1. General description
The PUCC3801 is a current-mode Pulse Width Modulated (PWM) controller
containing all the control and protection functions necessary to implement an off-line,
鏗倅back or forward converter with a minimum number of external components.
2. Features
s
Very low start-up supply current; 50
碌A
typical
s
Low operating supply current; 1.2 mA typical
s
Accurate, internally-trimmed, 鏗亁ed frequency oscillator (100 kHz). No external
timing components needed
s
Internal slope compensation. No external ramp components needed
s
Built-in over-voltage and under-voltage detection
s
High-speed over-current trip; 170 ns typical
s
Over-voltage clamp on supply voltage (V
DD
)
s
Internal divider regulates V
DD
to 12 V. No external divider needed
s
Leading edge blanking of the current sense signal
s
Control frequency modulated over a narrow band to reduce Electromagnetic
Interference (EMI)
s
High output drive capability; 150 ns typical rise and fall time into 2 nF load
s
Wide bandwidth (10 MHz) error ampli鏗乪r with external compensation pin and
simple interface to optocoupler
s
Accurate internal bandgap reference.
3. Applications
s
Off-line switched mode power supplies
s
Laptop computer mains adaptors
s
Printer power supplies.

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