AN2653 datasheet(11/22 Pages) STMICROELECTRONICS

11 / 22 page

AN2653

Out-of-the-loop compensation method

11/22

Figure 17.

Gain margin abacus in the case of a

voltage follower configuration

Figure 18.

Phase margin abacus in the case of

a voltage follower configuration

Voltage Follower Configuration - Gain Margin Abacus

Applied for Out-of-the-Loop Compensation Method

0.01

0.1

100

CL (F)

R1 (0 dB)

R1 (4 dB)

R1 (8 dB)

R1 (12 dB)

R1 (16 dB)

TS507 :

Vcc = 5 V

Vicm = 2,5 V

T = 25 °C

RL = 10 kΩ

UNSTABLE

STABLE

Voltage Follower Configuration - Phase Margin Abacus

Applied for Out-of-the-Loop Compensation Method

0.01

0.1

100

CL (F)

R1 (0 °)

R1 (10 °)

R1 (20 °)

R1 (30 °)

R1 (40 °)

UNSTABLE

TS507 :

Vcc = 5 V

Vicm = 2,5 V

T = 25 °C

RL = 10 kΩ

STABLE

Figure 19.

Gain margin abacus in the case of a

gain configuration of -10 or +11

Figure 20.

Phase margin abacus in the case of

a gain configuration of -10 or +11

Gain Configuration of either -10 or +11 - Gain Margin Abacus

Applied for Out-of-the-Loop Compensation Method

0.01

0.1

100

CL (F)

R1 (0 dB)

R1 (10 dB)

R1 (20 dB)

R1 (30 dB)

TS507 :

Vcc = 5 V

Vicm = 2,5 V

T = 25 °C

RL = 10 kΩ

UNSTABLE

STABLE

Gain Configuration of either -10 or +11 - Phase Margin Abacus

Applied for Out-of-the-Loop Compensation Method

0.01

0.1

100

CL (F)

R1 (0 °)

R1 (20 °)

R1 (40 °)

R1 (60 °)

UNSTABLE

TS507 :

Vcc = 5 V

Vicm = 2,5 V

T = 25 °C

RL = 10 kΩ

STABLE

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