AIC1577-PSTR datasheet(11/14 Pages) AIC

Part #	AIC1577-PSTR

Description	External NMOS Step-Down PWM Controller

Download	14 Pages

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Manufacturer	AIC [Analog Intergrations Corporation]

Direct Link	http://www.analog.com.tw

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AIC1577

return to its designed value when the peak inductor

value no longer exceeds over current protection

point.

11

Over Voltage Protection

Over voltage protection occurs when the FB pin

voltage (the negative input of error amplifier) ex-

ceeds 0.855V. The over voltage comparator will

force driver to pull low until output over voltage is

removed.

PCB Layout

Since operating in a high switching frequency,

500KHz, proper PCB layout and component place-

ment may enhance the performance of AIC 1577

application circuit. For a better efficiency, major loop

from input terminal to output terminal should be as

short as possible. In addition, in the case of a large

current loop, the track width of each component in

the loop should maintain as wide as possible.

In order to prevent the effect from noise, the GND

pin should be placed close to the ground. Also keep

the IC’s GND pin and the ground leads in the short-

est distance. Recommended layout diagrams and

component placement are as shown as figures 13

to 16. No sensitive components, which may cause

noise interference to the circuit, should be allowed

to be close to SW pin.

Furthermore, AIC1577 is a current mode controller.

Remaining the sense resistor close to both VIN and

CS pins is recommended for better efficiency and

output performance. In addition, all filtering and de-

coupling capacitors, such as C1 and C2, should

connect to AIC1577 as close as possible.

Fig. 13 Top Layer

Fig. 14 Bottom Layer

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AIC1577-PSTR Datasheet(PDF) 11 Page - Analog Intergrations Corporation

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