XRP7604 Datasheet, PDF (6/13 Pages) Exar Corporation – 1A 29V Non-Sync. Buck High Power LED Driver

XRP7604
1A 29V Non-Sync. Buck High Power LED Driver
0.210
0.205
VFB versus Vin at Iout = 750mA
1 LED
2 LED
0.200
0.195
0.190
5
10
15
20
25
30
Vin(V)
Fig. 6: Feedback Voltage vs Input Voltage
Ch1: Lx
Ch2: Vout(AC)
Ch4: Io 0.75A/div
Fig. 7: No Cout, Output Ripple=104mVpp, Vin=6V
1 LED, Vf=3.3V @ 0.75A
Ch1: Lx
Ch2: Vout(AC)
Ch4: Io 0.75A/div
Ch1: Lx
Ch2: Vout(AC)
Ch4: Io 0.75A/div
Fig. 8: No Cout, Output Ripple=284mVpp, Vin=29V
1 LED, Vf=3.3V @ 0.75A
Fig. 9: Cout=1uF, Output Ripple=164mVpp, Vin=29V
1 LED, Vf=3.3V @ 0.75A
Ch1: Vin
Ch2: Vout
Ch3: VFB
Ch4: Io 0.5A/div
Fig. 10: 5V Vin Startup
1 LED, Vf=3.3V @ 0.75A
Ch1: Vin
Ch2: Vout
Ch3: VFB
Ch4: Io 0.5A/div
Fig. 11: 12V Vin Startup
1 LED, Vf=3.3V @ 0.75A
© 2009 Exar Corporation
6/13
Rev. 1.0.0