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FP6291 Datasheet(PDF) 7 Page - Feeling Technology Corp.

Part No. FP6291
Description  1MHz, 2.5A Step-Up Current Mode PWM Converter
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Maker  FEELING [Feeling Technology Corp.]
Homepage  http://www.feeling-tech.com.tw/
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 7 page
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FP6291
This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.
No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.
Website: http://www.feeling-tech.com.tw
Rev. 0.70
7/11
Function Description
Operation
The FP6291 is a current mode boost converter. The constant switching frequency is 1MHz and
operates with pulse width modulation (PWM). Build-in 16V / 2.5A MOSFET provides a high output
voltage. The control loop architecture is peak current mode control; therefore slope compensation
circuit is added to the current signal to allow stable operation for duty cycles larger than 50%.
Soft Start Function
Soft start circuitry is integrated into FP6291 to avoid inrush current during power on. After the IC
is enabled, the output of error amplifier is clamped by the internal soft-start function, which causes
PWM pulse width increasing slowly and thus reducing input surge current.
Current Limit Program
A resistor between OC and GND pin programs peak switch current. The resistor value should be
between 19k and 96k. The current limit will be set from 2.5A to 0.5A. Keep traces at this pin as short as
possible. Do not put capacitance at this pin. To set the over current trip point according to the following
equation:
3
R
48000
IOCP
Over Temperature Protection (OTP)
FP6291 will turn off the power MOSFET automatically when the internal junction temperature is
over 150
°C. The power MOSFET wake up when the junction temperature drops 30°C under the OTP
threshold temperature.
Over Voltage Protection (OVP)
In some condition, the resistive divider may be unconnected, which will cause PWM signal to
operate with maximum duty cycle and output voltage is boosted higher and higher. The power
MOSFET will be turned off immediately, when the output voltage exceeds the OVP threshold level. The
FP6291’s OVP threshold is 16V.




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