UPC1933GR 查看數據表（PDF） - NEC => Renesas Technology

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UPC1933GR

DC-DC CONVERTER CONTROL IC

NEC => Renesas Technology 

µ PC1933

4. APPLICATION EXAMPLE

4.1 Application Example

Figure 4-1 shows an example circuit for obtaining +5 V/50 mA from a +3 V power supply.

Figure 4-1 Application Example

COM VIN = 3 V

C5

1 µF

RT 3.9 kΩ

C1

3300

pF

R1

30 kΩ

8765

FB RT GND OUT

µ PC1933

II DLY VCC VREF

1234

CDLY

0.1 µ F

C0

0.1 µ F

R2 47 kΩ

R5 150 Ω

R7

R3 20 kΩ

2.4 kΩ

VR4

1 kΩ

R6 470 Ω

Q1

C2

100

pF

Q2

R8

7.5 kΩ

L1 47 µ H

R9 68 Ω

C3 100 pF

R10

20 kΩ

D1

Q3

VO = + 5 V

IO = 50 mA

C4

68 µ F

COM

4.2 List of External Parts

The list below shows the external parts.

Table 4-1 List of External Parts

Symbol

C4

D1

L1

Q3

Q1

Q2

Parameter

Function

68 µ F Output capacitor

Schottkey diode

47 µ H Choke inductor

Switching transistor

Buffer transistor

Buffer transistor

Part number

20SA68M

D1FS4

636FY-470M

2SD2403

2SC1623

2SA812

Maker

SANYO

SHINDENGEN

TOKO

NEC

NEC

NEC

Remark

OS-CON, SA series

D73F series

Remarks 1. The capacitors that are not specified in the above list are multilayer ceramic capacitors.

2. The resistors that are not specified in the above list are 1/4W resistors.

16

Data Sheet G13690EJ3V0DS00

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