Datasheet > GM2950-5.0T92RLG

GM2950-5.0T92RLG

更新时间： 2022-03-20 14:07:54

品牌	Logo	应用领域
GAMMA		稳压器
页数	文件大小	规格书
10页	445K
描述
100mA, LOW DROPOUT VOLTAGE REGULATORS

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GM2950-5.0T92RLG 数据手册

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GM2950/GM2951

100mA, LOW DROPOUT

VOLTAGE REGULATORS

Application Notes



External Capacitors

For better stability, it recommended to use a 1.0μF or greater capacitor tied between V_OUTand

GND. The ESR of about 5Ω or less and resonant frequency above 500KHz are important

parameters in the value of capacitor. The capacitor value can be varied, at lower output current,

less output capacitance is required. For the currents below 10mA, the value of capacitor can

reduced to 0.33μF, and 0.1μF for 1mA.

More output capacitance is needed for GM2951 family at voltage below 5V since it runs the error

amplifier at lower gain. At worst case, 3.3μF or greater must be used for condition of 100mA load

at 1.25v output.

If GM2951 is connected to battery or between AC filter capacitor and input is 10 inches wire then

1μF tantalum or aluminum electrolytic capacitor should be connected between V_INand GND.

Instability can occur if stray capacitor to FB terminal (Pin 7). This could be eliminated by a 100pF

capacitor between V_OUTand FB pins and increasing output capacitor to 3.3μF.



Reducing Output Noise

To reduce the AC noise presented at V_OUTpins, one of the workable approaches is to reduce the

regulator bandwidth by increasing the output capacitor value. However, this approach is not

relatively efficient. It is recommended to use a bypass capacitor across R1 sine it reduces the

high frequency gain from 4 to unity. With the bypass capacitor, noise no longer scales with output

voltage so the improvements are more efficient.

Programming the Output Voltage

The GM2951 output voltage is programmable from 1.24V to 29V by external resistors shown in

figure below. Compared with fixed output voltage option, Pin 2 and Pin 6 are left open and the

external resistors R1 and R2 set the V_OUTby the formula:

V_OUT= V_REFx (1 + R1/R2)

Where V_REFis 1.235V

GM2951-A

V_OUT

V_IN

V_OUT

V_IN

SENSE

V_TAP

Shutdown

C_OUT

3.3μF

C_BYPASS

0.1μF

ERROR

C_IN

GND

100K

See Application

Note

Error Output

V_REF

GND

1...5 6 789 10

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