sc441c Semtech Corporation, sc441c Datasheet - Page 11

• Manufacturer Part Number: sc441c
• Description: High Efficiency Integrated Driver For 4-strings Of 150ma Leds
• Manufacturer: Semtech Corporation

Block Diagram
© 2010 Semtech Corporation
OVPRTN
FFLAG
IOGND
OVPIN
IOSET
VOUT
5
5
IO1
SS
0.9mA
0.9mA
LED CURRENT
SETTING
LED OPEN/SHORT/OVERSHOOT
CIRCUIT PROTECTION
ONE IO CHANNEL SHOWN
OVP
Detect
HICCUP
OVP
Fault
CURRENT
SOURCE
4.5uA
4.5uA
1uA
1uA
4
4
3V3
Figure 1. SC441C Block Diagram
1V
DISABLE1
FAULT-1
+
+
-
-
HICCUP
CONTROL
LOGIC
HICCUP
HICCUP
3
3
Fault
DISABLE2
+
+
-
-
UVLO
TSD
OSC
ILIM
ISENSE
UVLO & TSD
SS
S
R
Bandgap
Q
+
+
-
-
+
+
-
-
www.semtech.com
2
2
SC441C
SW
SW
PGND
PGND
COMP
VIN
AGND
PWM
EN
11