MC34166 datasheet(11/18 Pages) ONSEMI

Part #	MC34166

Description	3.0 A, Step?뭊p/Down/Inverting Switching Regulators

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Manufacturer	ONSEMI [ON Semiconductor]

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MC34166, MC33166

http://onsemi.com

11

4

2

1

5

3

+

CF

RF

R2

3.3 k

R1

EA

Reference

Thermal

Oscillator

S

R

Q

PWM

UVLO

ILIMIT

Vin

12 V

Cin

330

2.4 k

4.7 k

0.47

Q1

+

CO

2200

VO

−12 V/1.0 A

D1

1N5822

L

190

mH

C1

0.047

+

Test

Conditions

Results

Line Regulation

Vin = 8.0 V to 24 V, IO = 1.0 A

3.0 mV =

± 0.01%

Load Regulation

Vin = 12 V, IO = 0.1 A to 1.0 A

4.0 mV =

± 0.017%

Output Ripple

Vin = 12 V, IO = 1.0 A

80 mVpp

Short Circuit Current

Vin = 12 V, RL = 0.1 W

3.74 A

Efficiency

Vin = 12 V, IO = 1.0 A

81.2%

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.

Two potential problems arise when designing the standard voltage−inverting converter with the MC34166. First, the Switch Output emitter is

limited to −1.5 V with respect to the ground pin and second, the Error Amplifier’s noninverting input is internally committed to the reference and

is not pinned out. Both of these problems are resolved by connecting the IC ground pin to the converter’s negative output as shown in Figure 23.

This keeps the emitter of Q1 positive with respect to the ground pin and has the effect of reversing the Error Amplifier inputs. Note that the voltage

drop across R1 is equal to 5.05 V when the output is in regulation.

Figure 23. Voltage−Inverting Converter

+

Figure 24. Voltage−Inverting Converter Printed Circuit Board and Component Layout

(Bottom View)

(Top View)

3.0

″

Vin

VO

CF

RF

+−

+

−

+

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