Wing Shing WS337L Datasheet

General description

TO-92 WS337L

WS337L

3-TERMINAL ADJUSTABLE REGULATORS

INPUT

OUTPUT

ADJ

A

I

O

The WS337L is an adjustable 3-terminal negative voltage regulator capable of supplying 100mA over a 1.2V to 37V output range. It is
exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are
better than standard fixed regulators, Also, the WS337L is packaged in a standard TO-92 transistor package which is easy to use.
In addition to higher performance than fixed regulators, the WS337L offers full overload protection. Included on the chip are current limit,
thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment
terminal is disconnected.
Normally, only a single 1 μF solid tantalum output capacitor is needed unless the device is situated more than 6 inches from the input
filter capacitors, in which case an input bypass is needed. A larger output capacitor can be added to improve transient response, the
adjustment terminal can be bypassed to achieve very high ripple rejection ratios which are difficult to achieve with standard 3-terminal
regulators.
Besides replacing fixed regulators, the WS337L is useful in a wide variety of other applications. Since the regulator is “floating” and sees
only the input-to-output differential is not exceeded.
Also, it makes an especially simple adjustable switching regulator, a programmable output regulator, or by connecting a fixed resistor
between the adjustment and output, the WS337L can be used as a precision current regulator. Supplies with electronic shutdown can be
achieved by clamping the adjustment terminal to ground that program the output to 1.2V where most loads draw little current.
The WS337L is available in a standard TO-92 transistor package and a SO-8 surface mount package. The WS337 is rated for operation
over a 0℃ to + 70℃ range.

FEATURES

♦ Adjustable output down to 1.2V
♦ Guaranteed 100mA output current
♦ Line regulation typically 0.01%/V
♦ Load regulation typically 0.1%
♦ Current limit constant with temperature
♦ Eliminates the need to stock many voltages
♦ Standard 3-lead transistor package
♦ 80 dB ripple rejection

!

Output is short circuit protected

ELECTRICAL CHARACTERISTICS ♠

Power dissipation Internally Limited
Input-Output Voltage Differential 40v
Operating Junction

Temperature Range –0℃℃℃℃ to +70℃

℃

℃℃

1

Storage Temperature –55℃℃℃℃ to +150℃
Lead Temperature
Plastic Package (Soldiering 4 sec.) 260℃
ESD rating to be determined.

PARAMETER CONDITIONS MIN TYP MAX UNIT

ADJUSTMENT PIN CURRENT 50 100

ADJUSTMENT PIN CURRENT CHANGE

REFERENCE VOLTAGE

LINE REGULATION
LOAD REGULATION
TEMPERATURE STABILITY

MINIMUM LOAD CURRENT

CURRENT LIMIT

RMS OUTPUT NOISE, % OF VOUT

RIPPLE REJECTION RATIO

LONG-TERM STABILITY

♠1: Unless otherwise specified, these specifications apply 0℃ ≤ TJ ≤ 70 ℃ for the WS337L; VIN-V

power dissipation is internally limited, these specifications are applicable for power dissipation up to 625mW. I

♠

: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to

2

heating effects are covered under the specification for thermal regulation.
: Thermal resistance of the TO-92 package is 180℃/W junction to ambient with 0.4” leads from a PC board and 160℃/W junction to

♠

3

ambient with 0.125” lead length to PC board. The M package θ

5mA≦I
3V≦|V
3V≦|VIN-V
10mA≦I
3V≦|V
5mA≦I
T

MIN≦TJ≦TMAX

|V

IN-VOUT

3V≦|V
3V≦|V
|V

IN-VOUT

=25℃, 10HZ-f-10KH

T

A

V

OUT

C

ADJ

=70℃

T

A

≦100mA

OUT

|≦40V

IN-VOUT

|≦40V, ♠

OUT

≦100mA,P≦625MW

OUT

|≦40V♠

IN-VOUT

≦100mA♠

OUT

|≦40V

|≦15V

IN-VOUT

|≦13V

IN-VOUT

|=40V|

=-10V,F=120HZ, C

=10μF

is 180℃/W in still air

JA

0.2 5

3

2

2

-1.3 -1.25 -1.2 V

0.02 0.07 %/V

0.3 1.5 %

0.65 %

3.5 5 mA

2.2 3.5 mA

100 200 320 mA

25 50 120 mA

Z

=0

ADJ

0.03 %
65 dB

66 80 dB

0.3 1 %

= 5v and I

OUT

= 40mA. Although

OUT

is 100mA.

MAX

℃

℃℃

℃

℃℃

μA

μA

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