ADP1879 데이터 시트보기 (PDF) - Analog Devices

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ADP1879

Synchronous Buck Controller with Constant On Time and Valley Current Mode

Analog Devices 

ADP1878/ADP1879

Data Sheet

OUTPUT VOLTAGE

4

2

OUTPUT VOLTAGE

INDUCTOR CURRENT

1

SW NODE

3

CH1 5A Ω

M400ns

CH3 10V CH4 100mV BW T 30.6%

A CH3 2.20V

Figure 46. CCM Operation at Heavy Load, 12 A

(See Figure 95 for Application Circuit)

OUTPUT VOLTAGE

2

12A STEP

1

SW NODE

3

LOW SIDE

4

CH1 10A Ω CH2 200mV BW M2ms

CH3 20V

CH4 5V

T 75.6%

A CH1 3.40A

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

(See Figure 95 Application Circuit)

OUTPUT VOLTAGE

2

12A POSITIVE STEP

SW NODE

1

3

LOW SIDE

4

CH1 10A Ω CH2 200mV BW M20µs

CH3 20V CH4 5V

T 30.6%

A CH1 3.40A

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

12 A, VOUT = 1.8 V (See Figure 95 Application Circuit)

12A NEGATIVE STEP

1

SW NODE

3

4

CH1 10A Ω

CH3 20V

CH2 200mV

CH4 5V

LOW SIDE

BW M20µs

T 48.2%

A CH1

3.40A

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

12 A (See Figure 95 Application Circuit)

4

OUTPUT VOLTAGE

12A STEP

1

LOW SIDE

2

SW NODE

3

CH1 10A Ω

CH3 20V

CH2 5V

CH4 200mV

M2ms

BW T 15.6%

A CH1 6.20A

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

(See Figure 95 Application Circuit)

OUTPUT VOLTAGE

4

12A POSITIVE STEP

1

LOW SIDE

2

SW NODE

3

CH1 10A Ω CH2 5V

M20µs

CH3 20V CH4 200mV BW T 43.8%

A CH1 6.20A

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

at Light Load, 12 A, VOUT = 1.8 V (See Figure 95 Application Circuit)

Rev. B | Page 14 of 40

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