ADP5003ACPZ-R7 datasheet(25/31 Pages) AD

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Data Sheet

ADP5003

Rev. A | Page 25 of 31

DESIGNING THE COMPENSATION NETWORK FOR

THE BUCK REGULATOR USING ADAPTIVE

HEADROOM CONTROL

Due to the addition of the adaptive headroom scheme in the

feedback loop, a lower bandwidth is required. Set the crossover

frequency, fC, to fSW/60. In this example, fSW is set to 600 kHz;

therefore, fC is set to 10 kHz.

kΩ

1.76

A/V

600

2.5

kHz

(

)

15.2

kΩ

1.76

μF

0.001

0.433

26.7

kΩ

1.76

μF

0.001

Choose standard components: RC = 1.74 kΩ, CC = 22 nF,

CCP = 22 pF.

Figure 48 shows the load transient waveform.

CH1 1.00A

CH4 100mV

200µs

A CH3

1.38A

508µs

VPVOUT1

0.02A/µs

0.013A/µs

ILOAD1

Figure 48. 0.6 A to 2.4 A Load Transient for 2.5 V Output, fSW = 600 kHz,

L = 2.2 μH, RC = 1.74 kΩ, CC = 22 nF, CCP = 22 pF, CPVOUT1 = 47μF

SELECTING THE INPUT CAPACITOR FOR THE BUCK

REGULATOR USING ADAPTIVE HEADROOM

CONTROL

For the input capacitor, select a ceramic capacitor with a

minimum value of 10 µF. Place the input capacitor close to the

PVIN1 pin. In this example, one 10 µF, X5R, 25 V ceramic

capacitor is recommended.

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