MC33166 データシートの表示（PDF） - ON Semiconductor

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MC33166

3.0 A, Step−Up/Down/Inverting Switching Regulators

ON Semiconductor 

+

Oscillator

PWM

MC34166, MC33166

ILIMIT

S

Q

R

UVLO

Vin

12 V

4

+ Cin

330

Q1

2

D1

1N5822

Thermal

3

Reference

+

EA

+

1

L

190 mH

R2

6.8 k CO +

2200

VO

5.05 V/3.0 A

5

CF

RF

0.1

68 k

R1

Test

Conditions

Results

Line Regulation

Load Regulation

Vin = 8.0 V to 36 V, IO = 3.0 A

Vin = 12 V, IO = 0.25 A to 3.0 A

5.0 mV = ± 0.05%

2.0 mV = ± 0.02%

Output Ripple

Short Circuit Current

Efficiency

Vin = 12 V, IO = 3.0 A

Vin = 12 V, RL = 0.1 W

Vin = 12 V, IO = 3.0 A

10 mVpp

4.3 A

82.8%

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 19. 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

3.0″

VO

−+

+ Vin −

+

ÉÉÉÉÉÉÉÉÉÉRFÉÉÉÉÉRÉÉÉÉÉ1 CÉÉÉÉÉF

+

(Bottom View)

(Top View)

Figure 20. Step−Down Converter Printed Circuit Board and Component Layout

http://onsemi.com

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