MC33466 데이터 시트보기 (PDF) - Motorola => Freescale

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MC33466

FIXED FREQUENCY PWM MICROPOWER DC–to–DC CONVERTER

Motorola => Freescale 

Vin

330 µF

MC33466

Figure 19. MC33466H–33JT1 Step–Down Application

Startup Circuit

MMBT2222ALT1

BZX84C3V3LT1

1.5 k

3.3 V

MMBT2907ALT1

1.0 k

MBRD0520LT1

47 µH

VO

3.3 V

320 mA

100

3

Lx

MC33466H–33JT1

VLx Limiter

Drive

2

Output

PWM

Controller

50 kHz

Oscillator

Phase

Comp

Soft–Start

Vref

330 µF 330 µF

1 Gnd

Test

Line Regulation

Load Regulation

Output Ripple

Efficiency

Condition

Vin = 5.0 V to 10 V, IO = 320 mA

Vin = 7.0 V, IO = 3.3 mA to 320 mA

Vin = 7.0 V, IO = 320 mA

Vin = 7.0 V, IO = 320 mA

Results

7 mV = ±0.1%

3 mV = ±0.04%

70 mVpp

63.8%

8

MOTOROLA ANALOG IC DEVICE DATA

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