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PSSI2021SAY

Constant current source in SOT353 package

NXP Semiconductors. 

NXP Semiconductors

PSSI2021SAY

Constant current source in SOT353 package

8.1 Typical application circuits

LED driver

Figure 5 shows a typical application circuit for an LED driver. The constant current

ensures a constant LED brightness.

VS

VCC

Rext

REXT

GND

IOUT

Iout

LED

006aaa024

Fig 5. LED driver application diagram

Switching the current ON/OFF

The output can be switched ON and OFF by connecting a resistor-equipped transistor

(RET, e.g. PDTC124XU) as shown in Figure 6.

VS

VCC

Rext

REXT

IOUT

IN /

OUT

GND

OUT

Iout

LED

GND

006aaa025

Fig 6. Switching the current ON/OFF; application diagram

PSSI2021SAY_3

Product data sheet

Rev. 03 — 27 August 2009

© NXP B.V. 2009. All rights reserved.

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