LM883HVH NSC [National Semiconductor], LM883HVH Datasheet - Page 4

• Manufacturer Part Number: LM883HVH
• Description: 3-Terminal Adjustable Negative Regulators (High Voltage)
• Manufacturer: NSC [National Semiconductor]

www.national.com
Thermal Regulation
When power is dissipated in an IC, a temperature gradient
occurs across the IC chip affecting the individual IC circuit
components. With an IC regulator, this gradient can be espe-
cially severe since power dissipation is large. Thermal regu-
lation is the effect of these temperature gradients on output
voltage (in percentage output change) per Watt of power
change in a specified time. Thermal regulation error is inde-
pendent of electrical regulation or temperature coefficient,
and occurs within 5 ms to 50 ms after a change in power dis-
sipation. Thermal regulation depends on IC layout as well as
electrical design. The thermal regulation of a voltage regula-
tor is defined as the percentage change of V
within the first 10 ms after a step of power is applied. The
LM137HV’s specification is 0.02%/W, max.
In Figure 1 , a typical LM137HV’s output drifts only 3 mV (or
0.03% of V
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 shows a 3 mV step as
the LM137HV chip cools off. Note that the load regulation er-
ror of about 8 mV (0.08%) is additional to the thermal regu-
lation 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 Diagram
Order Number LM137HVK/883, LM137HVK-QMLV, or
OUT
Order Number LM337HVK STEEL
See NS Package Number K02C
See NS Package Number K02A
= −10V) when a 10W pulse is applied for
Metal Can Package
SMD # 7703404
Bottom View
TO-3
See Physical Dimensions section for further information)
DS009066-5
OUT
, per Watt,
Order Number LM137HVH/883, LM137HVH-QMLV, SMD
4
LM137HV, V
V
I
Vertical sensitivity, 5 mV/div
LM137HV, V
V
I
Horizontal sensitivity, 20 ms/div
L
L
IN
IN
= 0A 0.25A 0A
= 0A 0.25A 0A
−V
−V
OUT
OUT
See NS Package Number H03A
= −40V
= −40V
OUT
OUT
= −10V
= −10V
Metal Can Package
or LML337HVH
Bottom View
# 7703404
TO-39
FIGURE 1.
FIGURE 2.
DS009066-6
DS009066-3
DS009066-4