Ultra High Efficiency 82 - 91%

High Efficiency, Small, Low price, Step-Down DC-DC Converter

5 Watt VSA Series

(C) Output voltage changeable direction

Please open the terminal V.ADJ when you use the output voltage with

rating, without changing. By connecting resistance between the terminal

GND (3 Pin) and V.ADJ (5 Pin), you can change output voltage within the

range of voltage in Table 1. Please refer to the undermentioned equation

for the calculation of external resistance. Please confirm the output

voltage and adjust resistance value after calculating external resistance.

( Figure 6 )

To reduce the output voltage

Model

2.5S

3.3S

12S

Voltage Range

(1.5 to 2.5V)

(3 to 3.3V)

(9 to 12V)

Rx

2.13K ohm

765 ohm

8.6K ohm

Ry

1.0K ohm

2.2K ohm

2.2K ohm

Vref

0.8V

2.45V

2.45V

VO = It is your option.

To add the output voltage (for 2.5V and 3.3V model)

Model

2.5S

3.3S

12S

Voltage Range

(2.5 to 3.3V)

(3.3 to 5V)

Rx

2.13K ohm

765 ohm

Ry

1.0K ohm

2.2K ohm

Vref

0.8V

2.45V

VO = It is your option.

Note 1: When using at rating without adjusting the output voltage, keep

the V. ADJ pin (5pin) open.

Note 2: V. ADJ pin (5pin) is a high impedance point, so in a bad environment

this wiring may pick up noise and cause bad effect. When

energizing, avoid switching the output by opening and shortening

or switching the adjustable output resistor(R1, R2). And select a

R1, R2 that is accurate and has good temperature characteristics,

and mount it by soldering without using connectors or sockets

when it is pretty close to the converter.

Kaga Electronics(USA) Inc.

www.volgen.com

N/ A

Rx×Ry×(Vo-Vref)

Rx×Vref-Ry(Vo-Vref)

VR1 =

VR2 = OPEN

Vref×Rx×Ry

Ry(Vo-Vref)-Vref×Rx

VR2 =

VR1 = OPEN