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LM883HVK Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM883HVK
Descripción Electrónicos  3-Terminal Adjustable Negative Regulators (High Voltage)
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM883HVK Datasheet(HTML) 4 Page - National Semiconductor (TI)

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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
OUT, per Watt,
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
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 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 See Physical Dimensions section for further information)
DS009066-3
LM137HV, VOUT = −10V
VIN−VOUT = −40V
IL = 0A→0.25A→0A
Vertical sensitivity, 5 mV/div
FIGURE 1.
DS009066-4
LM137HV, VOUT = −10V
VIN−VOUT = −40V
IL = 0A→0.25A→0A
Horizontal sensitivity, 20 ms/div
FIGURE 2.
TO-3
Metal Can Package
DS009066-5
Bottom View
Order Number LM137HVK/883, LM137HVK-QMLV, or
SMD #7703404
See NS Package Number K02C
Order Number LM337HVK STEEL
See NS Package Number K02A
TO-39
Metal Can Package
DS009066-6
Bottom View
Order Number LM137HVH/883, LM137HVH-QMLV, SMD
#7703404
or LML337HVH
See NS Package Number H03A
www.national.com
4


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