Data Sheet

© 2008 Fairchild Semiconductor Corporation www.fairchildsemi.com
FAN8303 • Rev. 1.2 6
FAN8303 — 2 A 23 V Non-Synchronous Step-Down DC/DC Regulator
Typical Performance Characteristics
V
IN
= 12 V, V
OUT
= 5 V, L1 = 15 μH, C
IN
= 10 μF, C
OUT
= 22 μF, T
A
= +25
o
C, unless otherwise noted.
Figure 4. EN Startup with 2 A Load
Figure 5. EN Turn-off with 2 A Load
Figure 6. Power-on with 2 A Load
Figure 7. Power-off with 2 A Load
Figure 8. Load Transient Response (0.5 A to 1.5 A)
Figure 9. Load Transient Response (1.5 A to 0.5 A)
CH1(VO) : 2V, 500µs/div.
CH2(EN) : 4V, 500µs/div.
CH3(SW) : 6V, 500µs/div.
CH4(IL) : 1A, 500µs/div.
CH2
CH1
CH3
CH4
CH1(VO) : 2V, 50µs/div.
CH2(EN) : 4V, 50µs/div.
CH3(SW) : 6V, 50µs/div.
CH4(IL) : 1A, 50µs/div.
CH2
CH1
CH3
CH4
CH1(VO) : 2V, 1ms/div.
CH2(VIN) : 4V, 1ms/div.
CH3(SW) : 6V, 1ms/div.
CH4(Io) : 1A, 1ms/div.
CH1(VO) : 2V, 200µs/div.
CH2(VIN) : 4V, 200µs/div.
CH3(SW) : 6V, 200µs/div.
CH4(Io) : 1A, 200µs/div.
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
CH1(VO) : 5V offset
200mV, 50µs/div.
CH2(COMP) : 300mV, 50µs/div.
CH3(SW) : 10V, 50µs/div.
CH4(Io) : 1A, 50µs/div.
△Vo = 204mV
△Vo = 240mV
Slew Rate( 2.5A/µs)
Slew Rate( 2.5A/µs)
CH4
CH4
CH3
CH3
CH2
CH2
CH1
CH1
CH1(VO) : 5V offset
200mV, 50µs/div.
CH2(COMP) : 300mV, 50µs/div.
CH3(SW) : 10V, 50µs/div.
CH4(Io) : 1A, 50µs/div.