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LT3477 Datasheet

  • LT3477

  • PWM LED Driver and Boost, Flyback and SEPIC Controller

  • 24頁

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LTC3783
PWM LED Driver and Boost,
Flyback and SEPIC Controller
DESCRIPTIO
The LTC
廬
3783 is a current mode LED driver and boost,
flyback and SEPIC controller that drives both an N-channel
power MOSFET and an N-channel load PWM switch.
When using an external load switch, the PWMIN input not
only drives PWMOUT, but also enables controller GATE
switching and error amplifier operation, allowing the con-
troller to store load current information while PWMIN is
low. This feature (patent pending) provides extremely fast,
true PWM load switching with no transient overvoltage or
undervoltage issues; LED dimming ratios of 3000:1 can be
achieved digitally, avoiding the color shift normally asso-
ciated with LED current dimming. The FBP pin allows
analog dimming of load current, further increasing the
effective dimming ratio by 100:1 over PWM alone.
In applications where output load current must be re-
turned to V
IN
, optional constant current/constant voltage
regulation controls either output (or input) current or
output voltage and provides a limit for the other. I
LIM
provides a 10:1 analog dimming ratio.
For low- to medium-power applications, No R
SENSE
mode
can utilize the power MOSFET鈥檚 on-resistance to eliminate
the current-sense resistor, thereby maximizing efficiency.
The IC鈥檚 operating frequency can be set with an external
resistor over a 20kHz to 1MHz range and can be synchro-
nized to an external clock using the SYNC pin.
The LTC3783 is available in the 16-lead DFN and TSSOP
packages.
FEATURES
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
True Color PWM
TM
Delivers Constant Color with
3000:1 Dimming Ratio
Fully Integrated Load FET Driver for PWM Dimming
Control of High Power LEDs
100:1 Dimming from Analog Inputs
Wide FB Voltage Range: 0V to 1.23V
Constant Current or Constant Voltage Regulation
Low Shutdown Current: I
Q
= 20碌A(chǔ)
1% 1.23V Internal Voltage Reference
2% RUN Pin Threshold with 100mV Hysteresis
Programmable Operating Frequency (20kHz to
1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3f
OSC
Internal 7V Low Dropout Voltage Regulator
Programmable Output Overvoltage Protection
Programmable Soft-Start
Can be Used in a No R
SENSE
TM
Mode for V
DS
< 36V
16-Lead DFN and TSSOP Packages
APPLICATIO S
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鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
High Voltage LED Arrays
Telecom Power Supplies
42V Automotive Systems
24V Industrial Controls
IP Phone Power Supplies
, LTC and LT are registered trademarks of Linear Technology Corporation.
True Color PWM and No R
SENSE
are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patent pending.
TYPICAL APPLICATIO
V
IN
6V TO 16V
(< TOTAL V
F
OF LEDs)
1M
LTC3783
RUN
V
IN
PWMIN OV/FB
I
TH
PWMOUT
SS
I
LIM
GATE
V
REF
FBP
SENSE
FBN
INTV
CC
GND
FREQ
SYNC
350mA PWM LED Boost Application
10碌F
脳2
2.2碌H
ZETEX ZLL51000
V
OUT
<25V
237k
LED*
STRING
C
OUT
10碌F
V
PWMIN
5V/DIV
V
OUT
0.2V/DIV
AC COUPLED
I
L
2.5A/DIV
105k
0.1碌F
10碌F
10k
6k
M1
M2
4.7碌F
0.05鈩?/div>
12.4k
0.3鈩?/div>
GND
I
LED
0.5A/DIV
M1, M2: SILICONIX Si4470EY
*LUMILEDS LHXL-BW02
3783 TA01a
U
U
U
Typical Waveforms
1碌s/DIV
3783 TA01b
3783f
1

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