MC33167 查看數據表（PDF） - Motorola => Freescale

零件编号

产品描述 (功能)

生产厂家

MC33167

Power Switching Regulator

Motorola => Freescale 

+

Oscillator

PWM

MC34167 MC33167

Figure 18. Step–Down Converter

Vin

12 V

ILIMIT

S

Q

R

UVLO

4

+ Cin

330

Q1

2

D1

1N5825

Thermal

3

Reference

+

EA

+

1

L

190 µH

R2

6.8 k CO +

4700

VO

5.05 V/5.0 A

5

CF

RF

0.1

68 k

R1

Test

Conditions

Results

Line Regulation

Load Regulation

Output Ripple

Short Circuit Current

Efficiency

Vin = 10 V to 36 V, IO = 5.0 A

Vin = 12 V, IO = 0.25 A to 5.0 A

Vin = 12 V, IO = 5.0 A

Vin = 12 V, RL = 0.1 Ω

Vin = 12 V, IO = 5.0 A

Vin = 24 V, IO = 5.0 A

4.0 mV = ± 0.039%

1.0 mV = ± 0.01%

20 mVpp

6.5 A

78.9%

82.6%

L = Coilcraft M1496–A or General Magnetics Technology GMT–0223, 42 turns of #16 AWG on

Magnetics Inc. 58350–A2 core. Heatsink = AAVID Engineering Inc. 5903B, or 5930B.

The Step–Down Converter application is shown in Figure 18. The output switch transistor Q1 interrupts the input voltage, generating a squarewave at the LCO filter

input. The filter averages the squarewaves, producing a dc output voltage that can be set to any level between Vin and Vref by controlling the percent conduction

time of Q1 to that of the total oscillator cycle time. If the converter design requires an output voltage greater than 5.05 V, resistor R1 must be added to form a divider

network at the feedback input.

Figure 19. Step–Down Converter Printed Circuit Board and Component Layout

3.0″

(Bottom View)

VO

+ Vin –

+

ÉÉÉÉÉÉÉÉÉÉÉÉR–FÉÉÉÉÉÉR+ÉÉÉÉÉÉ1 CFÉÉÉÉÉÉ

+

(Top View)

8

MOTOROLA ANALOG IC DEVICE DATA

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