LT3922EUFD Datasheet, PDF (23/30 Pages) Linear Integrated Systems – 36V, 2A Synchronous Step-Up LED Driver

LT3922
Typical Applications
333mA Boost LED Driver Using Internal PWM and Analog CTRL Dimming
L1
4.7µH
0.1µF
V_IN
8V TO 27V
4.7µF
1M
365k
59.0k
V_IN
EN/UVLO
OVLO
SW BST _VOUT
GND
LT3922
V_OUT
FB
V_CTRL
1µF
0.1µF
(OPTION)
100k
97.6k
100k
2.2µF
CTRL
GND
V_REF
PWM
SYNC/SPRD
INTV_CC
FAULT
SS RT
RP
ISP
ISN
PWMTG
ISMON
V_C
10nF
45.3k 332k
10k
2MHz 122Hz
1nF
0.47µF
0.47µF
1M
33.2k
4.7µF
300mΩ
M1
30V
333mA
LED
L1: WURTH 74437324047
M1: VISHAY Si2319CDS
3922 TA03a
128:1 Internal PWM Dimming
10:1 Internal PWM Dimming
I_LED
100mA/DIV
V_CTRL = 2V
V_IN = 12V
f_PWM = 122Hz
10µs/DIV
3922 TA03b
128:1 Internal PWM with 20:1 Analog CTRL Dimming
I_LED
100mA/DIV
V_CTRL = 2V
V_IN = 12V
f_PWM = 122Hz
200µs/DIV
3922 TA03c
10:1 Internal PWM with 20:1 Analog CTRL Dimming
I_LED
10mA/DIV
V_CTRL = 0.3V
V_IN = 12V
f_PWM = 122Hz
10µs/DIV
I_LED
10mA/DIV
3922 TA03d
V_CTRL = 0.3V
V_IN = 12V
f_PWM = 122Hz
200µs/DIV
For more information www.linear.com/LT3922
3922 TA03e
3922f
23