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參數(shù)資料
| 型號： | LML337HVH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3-Terminal Adjustable Negative Regulators (High Voltage) |
| 中文描述： | 1.2 V-47 V ADJUSTABLE NEGATIVE REGULATOR, MBCY3 |
| 封裝： | METAL CAN, TO-39, 3 PIN |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 340K |
| 代理商： | LML337HVH |
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
, 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
= 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 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
See Physical Dimensions section for further information)
DS009066-3
LM137HV, V
= 10V
V
IN
V
OUT
= 40V
I
L
= 0A
→
0.25A
→
0A
Vertical sensitivity, 5 mV/div
FIGURE 1.
DS009066-4
LM137HV, V
= 10V
V
IN
V
OUT
= 40V
I
L
= 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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