ADP1879 데이터 시트보기 (PDF) - Analog Devices

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ADP1879

Synchronous Buck Controller with Constant On Time and Valley Current Mode

Analog Devices 

Data Sheet

2

OUTPUT VOLTAGE

1

SW NODE

12A NEGATIVE STEP

3

LOW

SIDE

4

CH1 10A Ω CH2 200mV

CH3 20V CH4 5V

BW M10µs

T 23.8%

A CH1 5.60A

Figure 52. Negative Step During Heavy Load Transient Behavior—Forced PWM

at Light Load, 12 A (See Figure 95 Application Circuit)

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

LOW SIDE

4

SW NODE

3

CH1 2V BW CH2 5A Ω

CH3 10V CH4 5V

M4ms

T 49.4%

A CH1 920mV

Figure 53. Output Short-Circuit Behavior Leading to Hiccup Mode

1

OUTPUT VOLTAGE

INDUCTOR CURRENT

2

SW NODE

3

LOW SIDE

4

CH1 5V BW CH2 10A Ω

CH3 10V CH4 5V

M10µs

T 36.2%

A CH2 8.20A

Figure 54. Magnified Waveform During Hiccup Mode

ADP1878/ADP1879

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

LOW SIDE

4

SW NODE

3

CH1 2V BW CH2 5A Ω

CH3 10V CH4 5V

M2ms

T 32.8%

A CH1 720mV

Figure 55. Start-Up Behavior at Heavy Load, 12 A, 300 kHz

(See Figure 95 Application Circuit)

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

LOW SIDE

4

3

CH1 2V BW CH2 5A Ω

CH3 10V CH4 5V

SW NODE

M4ms

T 41.6%

A CH1 720mV

Figure 56. Power-Down Waveform During Heavy Load

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

2

SW NODE

3

LOW SIDE

4

CH1 50mV BW CH2 5A Ω

CH3 10V BW CH4 5V

M2µs

T 35.8%

A CH2 3.90A

Figure 57. Output Voltage Ripple Waveform During PSM Operation

at Light Load, 2 A

Rev. B | Page 15 of 40

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