Philips PSSI2021SAY Datasheet

DISCRETE SEMICONDUCTORS

DATA SH EET

, halfpage

MBD127

PSSI2021SAY

Constant current source

Product specification 2001 May 07

Philips Semiconductors Product specification

Constant current source PSSI2021SAY

FEATURES

• One chip constant current source

• Reduced number of components and board space.

APPLICATIONS

• Especially suitable for space reduction in, for example,
LED driving circuits or active bias controlling.

DESCRIPTION

Resistor equipped PNP transistor with two diodes on one
chipinaplastic SC-88Apackage. Built-inbias resistorand
two diodes allow operation as constant current source.
The stabilized current canbe adjustedbetween 15 µAand
50 mA by connection of external resistors between
pins 4 and 5.

MARKING

TYPE NUMBER MARKING CODE

PSSI2021SAY S1p

PINNING

PIN SYMBOL DESCRIPTION

1 n.c. not connected
2I

stab/Vout

stabilized current/output voltage
3 GND ground
4R
5V

handbook, halfpage

5

1

Top view

external
S

2

external resistor

supply voltage

4

3

54

n.c.

Fig.1 Simplified outline (SC-88A) and symbol.

321

MGU348

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134).

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT

V
V
V
I

stab

P
T
T
T

S
out
R

tot
stg
j
amb

supply voltage − 75 V
output voltage VS=75V − 73 V
reverse voltage between all terminals − 0.5 V
continuous stabilized current (DC) − 50 mA
total power dissipation T

≤ 25 °C; note 1 − 335 mW

amb

storage temperature −65 +150 °C
junction temperature − 150 °C
operating ambient temperature −65 +150 °C

Note

1. Device mounted on a FR4 printed-circuit board.

2001 May 07 2

Philips Semiconductors Product specification

Constant current source PSSI2021SAY

THERMAL CHARACTERISTICS

SYMBOL PARAMETER CONDITIONS VALUE UNIT

R

th j-a

Note

1. Device mounted on a FR4 printed-circuit board.

CHARACTERISTICS

T

=25°C unless otherwise specified.

amb

SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT

I

stab

I

supply

∆I

stab

--------------­I

stab

∆ I

stab

-------------------------

∆TI

×

thermal resistance from junction to
ambient

stabilized current VS= 12 V; V

supply current VS= 12 V; V

stability of stabilized current as
a function of V

control

stability of stabilized current as

stab

a function of temperature

in free air; note 1 370 K/W

= 0 to 10 V;

out

R

I

stab

V
I

stab

V
T

V
T

= infinity

external

= 0 to 10 V;

out

=15µA

= 75 V; V

S

out

=0V;

=15µA
= 1 to 10 V; VS=12V;

out

=25°C

amb

=1V; VS=12V;

out

= −55 to +150 °C

amb

10 15 20 µA

− 240 370 µA

− 1.5 2.2 mA

− 0.5 1 %

− 0.15 0.3 %

2001 May 07 3