Datasheet > AN4003

AN4003

更新时间： 2022-11-25 11:11:24

品牌	Logo	应用领域
飞兆/仙童 - FAIRCHILD		PC
页数	文件大小	规格书
28页	233K
描述
PC POWER SUPPLY DESIGN WITH KA3511

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数据手册

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AN4003 数据手册

No. Name

Function

Supply voltage. Operating range is 14V~30V. V_CC=20V, Ta=25 C at test.

V_CC

COMP Error amplifier output. It is connected to non-inverting input of pulse width

modulator comparator.

E/A(-) Error amplifier inverting input. Its reference voltage is always 1.25V.

E/A(+) Error amplifier non-inverting input feedback voltage.This pin may be used to

sense power supply output voltage.

TREM Remote on/off delay. Ton/Toff=8ms/24ms (Typ.) with C=0.1µF. Its high/low

threshold voltage is 1.8V/0.6V.

REM

Remote on/off input. It is TTL operation and its threshold voltage is 1.4V. Voltage

at this pin can reach normal 4.6V, with absolutely maximum voltage, 5.25V. If

REM = “Low”, PWM = “Low”. That means the main SMPS is operational. When

REM = “High”, then PWM = “High” and the main SMPS is turned-off.

Ω

Oscillation frequency setting R. (Test Condition R_T=10k )

Oscillation frequency setting C. (Test Condition C_T=0.01µF)

Under-voltage detect pin. Its threshold voltage is 1.25V Typ.

DET

T_PG

PG delay. Td=250ms (Typ) with C_PG=2.2µF. The high/low threshold voltage are

1.8V/0.6V and the voltage of Pin10 is clamped at 2.9V for noise margin.

Power good output signal. PG = “High” means that the power is “Good” for

operation and PG = “Low” means “Power fail”.

Vref

V3.3

Precision voltage reference trimmed to 2%. (Typical Value = 5.03V)

Over voltage protection for output 3.3V. (Typical Value = 4.1V)

Over voltage protection for output 5V. (Typical Value = 6.2V)

Over voltage protection for output 12V. (Typical Value = 14.2V)

V12

This is prepared for an extra OVP input or another protection signal. (Typical

Value = 1.25V)

T_UVP

Timing pin for under voltage protection blank-out time. Its threshold voltage is

1.8V and clamped at 2.9V after full charging. Target of delay time is 250ms and

it is realized through external (C=2.2µF).

GND

DTC

Signal ground.

Deadtime control input. The dead-time control comparator has an effective

120mV input offset which limits the minimum output dead time. Dead time may

be imposed on the output by setting the dead time control input to a fixed

voltage, ranging between 0V to 3.3V.

Output drive pin for push-pull operation.

Power ground.

Output drive pin for push-pull operation.

Rev C, November 1999

1 2 345 6 7...28

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