MC33166D2T データシートの表示（PDF） - Motorola => Freescale

部品番号

コンポーネント説明

一致するリスト

MC33166D2T

POWER SWITCHING REGULATORS

Motorola => Freescale 

MC34166 MC33166

+

Oscillator

PWM

Figure 22. Voltage–Inverting Converter

Vin

12 V

ILIMIT

S

Q

R

UVLO

4

+ Cin

330

Q1

2

L

190 µH

Thermal

3

D1

1N5822

Reference

+

+

EA

R1

1

2.4 k

5

CF

RF

C1

0.47

4.7 k R2

0.047

3.3 k

VO

–12 V/1.0 A

CO

2200

Test

Conditions

Results

Line Regulation

Load Regulation

Output Ripple

Short Circuit Current

Efficiency

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

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

Vin = 12 V, IO = 1.0 A

Vin = 12 V, RL = 0.1 Ω

Vin = 12 V, IO = 1.0 A

3.0 mV = ± 0.01%

4.0 mV = ± 0.017%

80 mVpp

3.74 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 22. 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 Printed Circuit Board and Component Layout

3.0″

(Bottom View)

+

+

+

+

+ Vin –

+

ÎÎÎÎÎÎÎÎÎÎÎÎR–FÎÎÎÎÎÎVO +ÎÎÎÎÎÎCFÎÎÎÎÎÎ

+

(Top View)

10

MOTOROLA ANALOG IC DEVICE DATA

Share Link: