XRP6840 Exar Corporation, XRP6840 Datasheet - Page 8

• Manufacturer Part Number: XRP6840
• Description: 4.3a Supercapacitor Flash Led Driver With I2c
• Manufacturer: Exar Corporation

© 2009 Exar Corporation
Fig. 11: 0.11s Flash Duration with 0.55F Supercap at 4.3A,
LED V
Fig. 13: 200mA High Efficiency Torch Mode with 0.55F
Fig. 15: LED Current Settling Time: 0mA to 100mA.
Supercap, CH1=V
F
CH1=SDA, CH2=SCL, CH4=I
< 3.8V, CH1 = FLASH, CH2 = RDY, CH3 =V
CH4=I
CH4 = I
IN
VIN
, CH2=V
LED
=0.5A/div
=2A/div
OUT
LED
, CH3=LED
=0.1A/div
4
4
.
.
3
3
X
,
A
A
OUT
S
S
,
u
u
8/17
p
p
e
e
Fig. 14: 200mA Torch Mode with 0.55F Supercap, CH1=V
r
Fig. 12: 0.22s Flash Duration with 0.9F Supercap at 4.3A,
r
c
c
LED V
Fig. 16: LED Current Settling Time: 100mA to 200mA.
a
a
p
p
a
a
F
CH2=V
CH1=SDA, CH2=SCL, CH4=I
< 3.8V, CH1 = FLASH, CH2 = RDY, CH3 =V
c
c
i
i
t
t
o
o
OUT
r
r
, CH3=LED
F
F
CH4 = I
l
l
a
a
s
s
h
h
LED
L
L
X
, CH4=I
E
E
=2A/div
D
D
D
D
VIN
LED
r
r
i
i
=0.1A/div
v
v
=0.5A/div
e
e
X
X
r
r
R
R
w
w
P
P
Rev. 1.0.0
i
i
6
6
t
t
h
h
8
8
OUT
I
I
4
4
,
2
IN
2
0
0
C
,
C