Data Sheet G13690EJ3V0DS00

16

µµµµ 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

4.2

List of External Parts

The list below shows the external parts.

Table 4-1 List of External Parts

Symbol

Parameter

Function

Part number

Maker

Remark

C4

68

µ F

Output capacitor

20SA68M

SANYO

OS-CON, SA series

D1

Schottkey diode

D1FS4

SHINDENGEN

L1

47

µ H

Choke inductor

636FY-470M

TOKO

D73F series

Q3

Switching transistor

2SD2403

NEC

Q1

Buffer transistor

2SC1623

NEC

Q2

Buffer transistor

2SA812

NEC

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.

C1

Q2

Q1

Q3

D1

4

123

5

876

OUT

RT

FB

II

GND

DLY VCC VREF

µ PC1933

3300

pF

C2

pF

100

C3 100 pF

L1

µ H

47

C4

µ F

68

CDLY

µ F

0.1

C0

µ F

0.1

C5

µ F

1

R10

20 k

Ω

R9 68

Ω

RT 3.9 k

Ω

R3

2.4 k

Ω

VR4

1 k

Ω

R7

20 k

Ω

R5 150

Ω

R2 47 k

Ω

R6 470

Ω

R8

7.5 k

Ω

R1

30 k

Ω

COM

VO = + 5 V

IO = 50 mA

COM

VIN = 3 V