Sanken Electric Co STR20005 Datasheet

STR20000

Series

Switching Type

Chopper • Self Oscillation Type

Features

● Requires only 4 external components

● Small size and high efficiency

● Low switching noise

● Variable output voltage

● Use of Sanken semiconductors components ensures

high reliability

Applications

● For power supplies in office equipment such as
electronic typewriters, printers and copiers

● For power supplies in VCRs, personal CB radios
(fixed stations), etc.

External View

■Absolute Maximum Ratings (Ta=25°C)

Parameter Symbol Unit

DC Input Voltage V
DC Output Current IO 2.0 (pulse 3.0) A

Power Dissipation PD W

Operating Temperature T
Storage Temperature T
Thermal Resistance (junction-to-case) R

IN 45 V

op –20 to +100 °C

stg –20 to +125 °C

th(j-c) 1.8 °C/W

Ratings

STR20005

55 (T

C=25°C)

C=100°C)

13 (T

■Electrical Characteristics (Ta=25 °C)

Ratings

Parameter Symbol STR20005 Unit

min typ max

IN 840

DC Input Voltage Range V

Output Voltage V

Efficiency %

Line Regulation mV

Load Regulation mV

Ripple Rejection dB

Switching Frequency kHz

V

Condition

O 5.0 5.1 5.2

V

Condition

η

Condition

OLINE 50

∆V

Condition

OLOAD 100

∆V

Condition

REJ 45

R

Condition

f30

Condition

VIN=15 to 25V, IO=1.0A

VIN=20V, IO=0.5 to 1.5A

IO=1.0A

VIN=20V, IO=1.0A

72

VIN=20V, IO=1.0A

f=100 to 120Hz

VIN=20V, IO=1.0A

12

■Outline Drawing/Terminal Connections (unit: mm)

±0.2

4.5

±0.2

1.6

5°

±0.1

3.2

±0.1

2.0

Plastic Mold Package Type
Flammability: UL94V-0

Terminal Connections

q Output Voltage Adjustment
w Output Voltage Detection
e Switching Output (backside of case)

0.6

1.0

5°

±0.1

+0.2
–0

r Input
t Ground

Weight: Approx. 8.2 g

5°

*

(18)

±0.2

3.2

36°

±0.1

2.54

5° 5°

±0.3

15.4

±0.2

9.9

STR
Type

Lot number

±0.1

±0.1

3.81

3.81

(7.62)
(12.7)

±0.3

17.8

±0.1

4.0

qwert

1.2

0.6

2.54

±0.15

+0.2
–0.1

±0.1

±0.2

5.0

±0.2

max.

7.0

3.4

±0.3

23.0

(15.0)

(38.0)

(43.0)

±0.3

28.0

Note: Dimensions marked with are measured at the roots of the leads.

■Block Diagram ■Standard External Circuit

43

MIC1

Start

Circuit

R1

Tr

1

R2

Reference

Voltage

VR1

VR2

L=200µH

Di

RU3M

2

R3

C1

R4

1

R5

Use VR1 and VR2 only when adjusting the output voltages.

4

+ +

3
2
1

5

VR1 : Vout down

2 : Vout up

5

VR

RU3M forward voltage : 0.7V

■Typical Operating Characteristics

Rise Characteristics Efficiency Characteristics Ta-PD Characteristics

10

8

(V)

O

I

O

6

0A

1A

4

2A

2

Output Voltage V

0

0246

Input Voltage VIN (V)

810

12 14 16 18 20

Ta=25°C

100

90
80
70
60
50
40
30

Efficiency η (%)

20
10

0

0 0.5 1 1.5 2 2.5

Output Current I

Ta=25°C

O (A)

VIN
8V

20V
30V
40V

25

20

(W)

D

150×150×2 (3.3°C/w)

15

100×100×2 (5.2°C/w)

10

75×75×2 (7.6°C/w)

5

Without heatsink

Power Dissipation P

0

–20 0 20 40 60 80 100

Ambient Temperature Ta (°C)

V

OUTVIN

DC OutputDC Input

1000µF1000µF

GNDGND

Without Mica
With Silicone Grease
Heatsink: Aluminum
Unit: mm

13