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參數(shù)資料
| 型號： | GM432BST25T |
| 廠商： | American Power Management Inc. |
| 英文描述： | 1.24V ADJUSTABLE PRECISION SHUNT REGULATORS |
| 中文描述： | 兩種器件可調(diào)整精密并聯(lián)穩(wěn)壓器 |
| 文件頁數(shù)： | 12/13頁 |
| 文件大?。?/td> | 187K |
| 代理商： | GM432BST25T |
Stability Boundary Conditions
A Note About Stability
When using the GM432 as a shunt regulator, you can
optimize stability by setting C either (1) no load ca-
L
pacitance across the GM432, decouple at the load; or
(2) large capacitance across the GM432, optional de-
coupling at the load. The GM432 can become unsta-
ble with capacitances of approximately 10nF to 1F
when cathode currents are less than 3mA or so, with
instability increasing as cathode current is reduced.
So, while the GM432 is happily stable at, for example,
cathode current of 10mA with a 0.1F capacitor
across it, it can oscillate transiently as the cathode cur-
rent rises through the region of instability. To avoid
this problem completely, simply eliminate the capaci-
tor or select a very low or very high (e.g. 10F) capac-
itor C . Since you will probably want local decoupling
L
at the load, the best idea is to use no capacitance
across the device. Just the resistance and capaci-
tance of the PCB traces and vias will prevent local
load decoupling from causing transient oscillation dur-
ing start-up. If you place the GM432 right next to the
load, with the load decoupling capacitor directly
across it, you must use a capacitor of
nF or
10F.
+
_
R
GM432
R1
R2
CL
IK
C - Load Capacitance - F
L
Tantalum Capacitors
* Stability boundary condition test shows that tantalum capacitors
are recommended to minimize the conditions that may cause
the device to oscillate.
16
14
12
10
8
6
4
2
0
0.001
0.01
0.1
1
10
C
- Load Capacitance - F
L
Tantalum Capacitors
C
a
th
o
d
e
C
u
rr
e
n
t-
m
A
T =25°C
A
V=V
KA
ref
Stable
V =2V
KA
V =3V
KA
1.0
0.8
0.6
0.4
0.2
0
0.001
0.01
0.1
1
10
C
a
th
o
d
e
C
u
rr
e
n
t-
m
A
For V
= 2 & 3V
KA
Device does not
Oscillate
T =25°C
A
Stable
V=V
KA
ref
G
M
4
3
2
8
A
MICROELECTRONICS
GM432
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS
Power Management
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| GM432BST89R | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.24V ADJUSTABLE PRECISION SHUNT REGULATORS |
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| GM432BT92RL | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.24V ADJUSTABLE PRECISION SHUNT REGULATORS |
| GM432BT92T | 制造商:GAMMA 制造商全稱:GAMMA 功能描述:1.24V ADJUSTABLE PRECISION SHUNT REGULATORS |
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