ADP1871 datasheet(14/44 Pages) AD

Part #	ADP1871

Description	Synchronous Buck Controller with Constant On-Time and Valley Current Mode

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Manufacturer	AD [Analog Devices]

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14 / 44 page

ADP1870/ADP1871

Rev. 0 | Page 14 of 44

CH1 5A

Ω

CH3 10V

CH4 100mV

B

W

M400ns

A CH3

2.20V

T 30.6%

1

3

4

OUTPUT VOLTAGE

INDUCTOR CURRENT

SW NODE

Figure 46. CCM Operation at Heavy Load, 12 A

(See Figure 93 for Application Circuit)

CH1 10A

Ω

CH2 200mV

B

W

CH3 20V

CH4 5V

M2ms

A CH1

3.40A

T 75.6%

1

2

3

4

OUTPUT VOLTAGE

12A STEP

SW NODE

LOW SIDE

Figure 47. Load Transient Step—PSM Enabled, 12 A

(See Figure 93 Application Circuit)

CH1 10A

Ω

CH2 200mV

B

W

CH3 20V

CH4 5V

M20µs

A CH1

3.40A

T 30.6%

1

2

3

4

OUTPUT VOLTAGE

12A POSITIVE STEP

SW NODE

LOW SIDE

Figure 48. Positive Step During Heavy Load Transient Behavior—PSM Enabled,

12 A, VOUT = 1.8 V (See Figure 93 Application Circuit)

CH1 10A

Ω

CH2 200mV

B

W

CH3 20V

CH4 5V

M20µs

A CH1

3.40A

T 48.2%

1

2

3

4

OUTPUT VOLTAGE

12A NEGATIVE STEP

SW NODE

LOW SIDE

Figure 49. Negative Step During Heavy Load Transient Behavior—PSM Enabled,

12 A (See Figure 93 Application Circuit)

CH1 10A

Ω

CH2 5V

CH3 20V

CH4 200mV

B

W

M2ms

A CH1

6.20A

T 15.6%

1

2

3

4

OUTPUT VOLTAGE

12A STEP

SW NODE

LOW SIDE

Figure 50. Load Transient Step—Forced PWM at Light Load, 12 A

(See Figure 93 Application Circuit)

CH1 10A

Ω

CH2 5V

CH3 20V

CH4 200mV

B

W

M20µs

A CH1

6.20A

T 43.8%

1

2

3

4

OUTPUT VOLTAGE

12A POSITIVE STEP

SW NODE

LOW SIDE

Figure 51. Positive Step During Heavy Load Transient Behavior—Forced PWM

at Light Load, 12 A, VOUT = 1.8 V (See Figure 93 Application Circuit)

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