Datasheet > GM432AS8R

GM432AS8R

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
GAMMA		稳压器
页数	文件大小	规格书
13页	229K
描述
1.24V ADJUSTABLE PRECISION SHUNT REGULATORS

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GM432AS8R 数据手册

Power Management

A A

MICROELECTRONICS

GM432

1.24V ADJUSTABLE PRECISION SHUNT REGULATORS

Stability Boundary Conditions

A Note About Stability

When using the GM432 as a shunt regulator, you can

optimize stability by setting C_Leither (1) no load ca-

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 1µF

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 0.1µF 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. 10µF) capac-

T =25°C

ref

Stable

V_KA=2V

=3V

itor C . Since you will probably want local decoupling

0.001

0.01

0.1

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 10µF.

- Load Capacitance - µF

Tantalum Capacitors

1.0

0.8

0.6

0.4

0.2

T =25°C

KA ref

Stable

For V = 2 & 3V

Device does not

Oscillate

0.001

0.01

0.1

C_L- Load Capacitance - µF

Tantalum Capacitors

GM432

* Stability boundary condition test shows that tantalum capacitors

are recommended to minimize the conditions that may cause

the device to oscillate.

1...5 6 789 10 11...13

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