FAN8303 Просмотр технического описания (PDF) - ON Semiconductor

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FAN8303

2 A 23 V Non-Synchronous Step-Down DC/DC Regulator

ON Semiconductor 

Typical Performance Characteristics

VIN = 12 V, VOUT = 5 V, L1 = 15 μH, CIN = 10 μF, COUT = 22 μF, TA = +25oC, unless otherwise noted.

CH2

CH1(VO) : 2V, 500µs/div.

CH2(EN) : 4V, 500µs/div.

CH3(SW) : 6V, 500µs/div.

CH4(IL) : 1A, 500µs/div.

CH2

CH1(VO) : 2V, 50µs/div.

CH2(EN) : 4V, 50µs/div.

CH3(SW) : 6V, 50µs/div.

CH4(IL) : 1A, 50µs/div.

CH1

CH3

CH4

CH1

CH3

CH4

Figure 4. EN Startup with 2 A Load

Figure 5. EN Turn-off with 2 A Load

CH1

CH2

CH3

CH4

CH1(VO) : 2V, 1ms/div.

CH2(VIN) : 4V, 1ms/div.

CH3(SW) : 6V, 1ms/div.

CH4(Io) : 1A, 1ms/div.

Figure 6. Power-on with 2 A Load

CH1

CH2

CH3

CH4

CH1(VO) : 2V, 200µs/div.

CH2(VIN) : 4V, 200µs/div.

CH3(SW) : 6V, 200µs/div.

CH4(Io) : 1A, 200µs/div.

Figure 7. Power-off with 2 A Load

CH1

△Vo = 240mV

CH1(VO) : 5V offset

200mV, 50µs/div.

CH2(COMP) : 300mV, 50µs/div.

CH3(SW) : 10V, 50µs/div.

CH4(Io) : 1A, 50µs/div.

CH4

CH3

CH2

Slew Rate( 2.5A/µs)

CH1

△Vo = 204mV

Slew Rate( 2.5A/µs)

CH4

CH3

CH2

CH1(VO) : 5V offset

200mV, 50µs/div.

CH2(COMP) : 300mV, 50µs/div.

CH3(SW) : 10V, 50µs/div.

CH4(Io) : 1A, 50µs/div.

Figure 8. Load Transient Response (0.5 A to 1.5 A)

Figure 9. Load Transient Response (1.5 A to 0.5 A)

© 2008 Fairchild Semiconductor Corporation

FAN8303 • Rev. 1.2

6

www.fairchildsemi.com

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