LM137 datasheet(4/12 Pages) NSC

4 / 12 page

Thermal Regulation (Continued)

In Figure 1, a typical LM137’s output drifts only 3 mV (or

0.03% of V

OUT = −10V) when a 10W pulse is applied for

10 ms. This performance is thus well inside the specification

limit of 0.02%/W x 10W = 0.2% max. When the 10W pulse is

ended, the thermal regulation again showsa3mV step at

the LM137 chip cools off. Note that the load regulation error

of about 8 mV (0.08%) is additional to the thermal regulation

error. In Figure 2, when the 10W pulse is applied for 100 ms,

the output drifts only slightly beyond the drift in the first

10 ms, and the thermal error stays well within 0.1% (10 mV).

Connection Diagrams

TO-3

Metal Can Package

TO-39

Metal Can Package

00906705

Case is Input

Bottom View

Order Number LM137K/883

LM137KPQML and LM137KPQMLV(Note 5)

See NS Package Number K02C

Order Number LM337K STEEL

See NS Package Number K02A

00906706

Case Is Input

Note 5: See STD Mil DWG 5962P99517 for Radiation Tolerant Devices

Bottom View

Order Number LM137H, LM137H/883 or LM337H

LM137HPQML and LM137HPQMLV(Note 5)

See NS Package Number H03A

00906704

LM137, VOUT = −10V

VIN −VOUT = −40V

IL =0A → 0.25A → 0A

Horizontal sensitivity, 20 ms/div

FIGURE 2.

LM137 Datasheet(PDF) 4 Page - National Semiconductor (TI)