
NCP5680
GND C4
GND
C2N C2P
23
22
21
20
C1N C1P
17
24
16
14
3 SCL
4 SDA
SDA
Vds1
1 VSD
Vgs1
Is1
2
Vds2
8
AGND
PGND U1
7
NCP5680
R1
C5 +
Q2
+Vbat
C1 0.22uF C2 C3 0.22uF
100uF
10uF
19
Vout
PVbat IsSCH
TRIG 5 TRIGFL VgsSCH 15
SCAP
SCL Vbias
10
PHOTO SENSE 12
Q1
R2 100k 11
GND PHSEN
GND 6 NTC 9
NTC
1 3 Vgs2
GND Is2
18
AUXILIARIES
NTGS3433
0.5R Q4
2
3 ?
1
GND
D1
NTLJS4114
PWF3
R4 GND
0.10R
D2
NTLJS4114 Q3 PWF3
R5
GND
0.10R
Figure 1. Typical Dual White LED Driver
GND
C1N
C1P C2N
C2P
Vbat
23
24
22 21
CHARGE PUMP
20
19
18
GND
Vout
PGND
R4
0.50 R
Isp
15
GND
Vbias
3
C1
?
GND
TRIGFL
SCL
SDA
R3
NTC
VSD
5
3
4
6
1
DIGITAL &
ANALOG
I2C
CONTROL
OVLD1 Control
OVLD2
17
Vreg I2C Cntl Re ? charge
Current 16
R R
14
SuperCAP Bias
Vbat
10mA ? 150mA
IsSC
SuperCAP
Icharge Control
VgsSC Q7
SCAP
2
+
0.5 Farad
1
GND
11
D1
PHOTO
R5
PHSEN
2
13
OVLD1
WLED1
DLYLED1
FILED1
GND
OVER
LOAD
10
Iout Control 12
+ ?
Vds1
Vgs1
Is1
LED#1
AGND
GND
Vbat
10mA ? 150mA
Time Out
OVLD2
GND
OVER
LOAD
9
Vds2
WLED# = Flash Duration
DLYLED# = Flash Delay
FILED# = LED Peak Current
WLED2
DLYLED2
FILED2
Iout Control
+ ?
8
7
Vgs2
Is2
LED#2
Figure 2. Simplified Block Diagram
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