ADP2105(Rev0) Ver la hoja de datos (PDF) - Analog Devices

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componentes Descripción

Fabricante

ADP2105
(Rev.:Rev0)

1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters

Analog Devices 

LX NODE

(SWITCH NODE)

3

1

OUTPUT VOLTAGE (AC-COUPLED)

4

INDUCTOR CURRENT

CH1 50mV

CH3 2V

CH4 200mAΩ

M 2µs

T 6%

A CH3 3.88V

Figure 28. PFM Mode of Operation at Very Light Load (10 mA)

3

LX NODE (SWITCH NODE)

1

OUTPUT VOLTAGE (AC-COUPLED)

4

INDUCTOR CURRENT

CH1 50mV

CH3 2V

CH4 200mAΩ

M 400ns

T 17.4%

A CH3 3.88V

Figure 29. DCM Mode of Operation at Light Load (100 mA)

LX NODE (SWITCH NODE)

3

1

OUTPUT VOLTAGE (AC-COUPLED)

INDUCTOR CURRENT

4

CH1 20mV

M 2µs

CH3 2V

CH4 1AΩ

T 13.4%

A CH3 1.84V

Figure 30. Minimum Off Time Control at Dropout

ADP2105/ADP2106/ADP2107

LX NODE (SWITCH NODE)

3

1

OUTPUT VOLTAGE (AC-COUPLED)

INDUCTOR CURRENT

4

CH1 20mV

CH3 2V

CH4 1AΩ

M 1µs

T 17.4%

A CH3 3.88V

Figure 31. PWM Mode of Operation at Medium/Heavy Load (1.5 A)

LX NODE (SWITCH NODE)

3

CHANNEL 3

FREQUENCY

= 336.6kHz

Δ: 2.86A

@: 2.86A

INDUCTOR CURRENT

OUTPUT VOLTAGE

1

4

CH1 1V

CH3 5V

CH4 1AΩ

M 4µs

T 45%

A CH3 1.8V

Figure 32. Current Limit Behavior of ADP2107 (Frequency Foldback)

ENABLE VOLTAGE

3

OUTPUT VOLTAGE

1

INDUCTOR CURRENT

4

CH1 1V

CH3 5V

CH4 500mAΩ

M 400µs

T 20.2%

A CH1 1.84V

Figure 33. Startup and Shutdown Waveform (CSS = 1 nF → SS Time = 1 ms)

Rev. 0 | Page 11 of 32

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