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型號：	RCB006
文件頁數(shù)：	657/1328頁
文件大?。?/td>	9519K
代理商：	RCB006

PRODUCT SPECIFICATION

Current Limit Sense Pin.

Connect to the switching node between the source

of Q1 and the drain of Q2. If I

drops below I

when G1 is on, the RC5053

will go into current limit. The current limit circuit can be disabled by floating

and shorting I

through an external 10k resistor.

Connect to an external capacitor to implement a soft start function.

During moderate overload conditions, the soft start capacitor will be

discharged slowly in order to reduce the duty cycle. In hard current limit, the

soft start capacitor will be forced low immediately and the RC5053 will rerun a

complete soft start cycle. C

must be selected such that during power-up the

current through Q1 will not exceed the current limit value.

External Compensation.

The COMP pin is connected directly to the output of

the error amplifier and the input of the PWM comparator. An RC+ C network is

used at this node to compensate the feedback loop to provide optimum

transient response.

Over-Temperature Fault.

OT is an open-drain output and will be pulled low if

OUTEN is less than 2V.

Overvoltage Fault.

FAULT is an open-drain output. If V

above the nominal output voltage, FAULT will go low and G1 and G2 will be

disabled. Once triggered, the RC5053 will remain in this state until the power

supply is recycled or the OUTEN pin is toggled. If OUTEN = 0, FAULT floats or

is pulled high by an external resistor.

This is an open-drain signal to indicate validity of output

voltage. A high indicates that the output has settled to within

5% of the rated

output for more than 1ms. PWRGD will go low if the output is out of regulation

for more than 500

s. If OUTEN = 0, PWRGD pulls low.

Digital Voltage Select.

TTL inputs used to set the regulated output voltage

required by the processor (Table 3). There is an internal 20k

pull-up at each

pin. When all five VIDn pins are high or floating, the chip will shut down.

Output Enable.

TTL input which enables the output voltage.The external

MOSFET temperature can be monitored with an external thermistor as shown

in Figure 6. When the OUTEN input voltage drops below 2V, OT trips. As

OUTEN drops below 1.7V, the drivers are internally disabled to prevent the

MOSFETs from heating further. If OUTEN is less than 1.2V for longer than

s, the RC5053 will enter shutdown mode. The internal oscillator can be

synchronized to a faster external clock by applying the external clocking signal

to the OUTEN pin.

Gate Drive for the Upper N-Channel MOSFET, Q1.

This output will swing

to GND. It will always be low when G2 is high or the output is

VID0, VID1, VID2,

Absolute Maximum Ratings

Supply Voltage

Input Voltage

All Other Inputs

Pin Definitions

Pin Description

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相關(guān)代理商/技術(shù)參數(shù)	參數(shù)描述
RCB006K	制造商:未知廠家制造商全稱:未知廠家功能描述:
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