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LT3795 Datasheet(PDF) 1 Page - Linear Integrated Systems

Part # LT3795
Description  36V, 2A Synchronous Step-Up LED Driver
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Manufacturer  LINEAR [Linear Integrated Systems]
Direct Link  http://www.linearsystems.com
Logo LINEAR - Linear Integrated Systems

LT3795 Datasheet(HTML) 1 Page - Linear Integrated Systems

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LT3922
1
3922f
For more information www.linear.com/LT3922
Typical applicaTion
FeaTures
DescripTion
36V, 2A Synchronous
Step-Up LED Driver
The LT®3922 is a monolithic, synchronous, step-up DC/
DC converter that utilizes fixed-frequency, peak current
control and provides PWM dimming for a string of LEDs.
The LED current is programmed by an analog voltage or
the duty cycle of pulses at the CTRL pin. The LT3922 will
maintain±2%currentregulationthroughanexternalsense
resistor over a wide range of output voltages.
The switching frequency is programmable from 200kHz
to 2MHz by an external resistor at the RT pin or by an
external clock applied at the SYNC/SPRD pin. With the
optionalSpreadSpectrumFrequencyModulationenabled,
the frequency varies from 100% to 125% to reduce EMI.
The LT3922 also includes a driver for an external high-
side PFET for PWM dimming and an internal PWM signal
generator for analog control of PWM dimming when an
external signal is not available.
Additional features include an accurate external reference
voltage for use with the CTRL and PWM pins, an LED
current monitor, an accurate EN/UVLO pin threshold,
open-drainfaultreportingforopen-circuitandshort-circuit
load conditions, and thermal shutdown.
2MHz, 93% Efficient 10W (30V, 333mA) Boost LED Driver
Efficiency vs VIN
applicaTions
n
±2% LED Current Regulation
n
±2% Output Voltage Regulation
n
5000:1 PWM Dimming at 100Hz
n
128:1 Internal PWM Dimming
n
Spread-Spectrum Frequency Modulation
n
Silent Switcher® Architecture for Low EMI
n
Operates in Boost, Buck Mode and Buck-Boost Mode
n
2.8V to 36V Input Voltage Range
n
Up to 34V LED String Voltage
n
2A, 40V Internal Switches
n
200kHz to 2MHz with SYNC Function
n
Analog or Duty Cycle LED Current Control
n
Open/Short LED Protection and Fault Indication
n
Thermally Enhanced 28-Pin (4mm × 5mm) QFN
n
Automotive and Industrial Lighting
n
Machine Vision
L
, LT, LTC, LTM, Linear Technology, the Linear logo and Silent Switcher are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 7199560, 7321203, and other patents
pending.
VIN
VIN
8V TO 27V
365k
59.0k
100k
EN/UVLO
OVLO
VREF
CTRL
ANALOG DIM
PWM DIM
PWM
SYNC/SPRD
INTVCC
FAULT
BST
SW
VOUT
VOUT
FB
RP
VC
RT
ISP
GND
GND
ISN
PWMTG
ISMON
3922 TA01a
LT3922
1M
1M
33.2k
100k
10k
1nF
1µF
0.1µF
L1
4.7µH
M1
300m
4.7µF
0.47µF
0.47µF
30V
333mA
LED
SS
45.3k
2MHz
2.2µF
10nF
4.7µF
VLED = 30V
fSW = 2MHz
100% PWM Duty Cycle
VIN (V)
6
9
12
15
18
21
24
27
30
70
75
80
85
90
95
100
3922 TA01b


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