MB3778 Просмотр технического описания (PDF) - Fujitsu

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MB3778

Switching Regulator Controller

Fujitsu 

MB3778

■ TEST CIRCUIT

SW

CPE

CTL

INPUT VCC = 6 V

TEST

4.7 kΩ

4.7 kΩ

16 15 14 13 12 11 10 9

MB3778

12345678

OUTPUT 1

OUTPUT 2

330 pF

15 kΩ

TEST

INPUT

■ TIMING CHART (Internal Waveform)

Triangular waveform oscillator output

Short circuit protection

comparator Reference

input

Dead Time, PWM input

voltage

2.1 V

1.9 V

1.6 V

1.3 V

Error Amp output

PWM comparator

output

"High"

"Low"

Output Transistor

collector waveform

"High"

"Low"

S.C.P. Terminal

waveform

0.65 V

0.05 V

Short circuit protection "High"

comparator output

"Low"

Control Input

voltage

2.1 V

(VCTL : Min Value)

0V

Power supply voltage

3.6 V

(VCC : Min Value)

0V

Power “ON”

DEAD TIME 100%

tPE

Power “OFF”

Protection Enable Time tPE 0.6 × 106 × CPE (µs)

9

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