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Linear Technology Electronic Components Datasheet

LTC3783IFE Datasheet

Flyback and SEPIC Controller

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LTC3783
FEATURES
PWM LED Driver and Boost,
Flyback and SEPIC Controller
DESCRIPTION
n True Color PWMTM Delivers Constant Color with
3000:1 Dimming Ratio
n Fully Integrated Load FET Driver for PWM Dimming
Control of High Power LEDs
n 100:1 Dimming from Analog Inputs
n Wide FB Voltage Range: 0V to 1.23V
n Constant Current or Constant Voltage Regulation
n Low Shutdown Current: IQ = 20µA
n 1% 1.23V Internal Voltage Reference
n 2% RUN Pin Threshold with 100mV Hysteresis
n Programmable Operating Frequency
(20kHz to 1MHz) with One External Resistor
n Synchronizable to an External Clock Up to 1.3fOSC
n Internal 7V Low Dropout Voltage Regulator
n Programmable Output Overvoltage Protection
n Programmable Soft-Start
n Can be Used in a No RSENSETM Mode for VDS < 36V
n 16-Lead DFN and TSSOP Packages
APPLICATIONS
n High Voltage LED Arrays
n Telecom Power Supplies
n 42V Automotive Systems
n 24V Industrial Controls
n IP Phone Power Supplies
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM and No RSENSE are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
The LTC®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 switch-
ing and error amplifier operation, allowing the controller
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
associated 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 returned
to VIN, optional constant current/constant voltage regula-
tion controls either output (or input) current or output
voltage and provides a limit for the other. ILIM provides a
10:1 analog dimming ratio.
For low- to medium-power applications, No RSENSE mode
can utilize the power MOSFET’s on-resistance to eliminate
the current-sense resistor, thereby maximizing efficiency.
The IC’s 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.
TYPICAL APPLICATION
350mA PWM LED Boost Application
VIN
6V TO 16V
(< TOTAL VF OF LEDs)
1M
10µF
×2 2.2µH
ZETEX ZLLS1000
LTC3783
0.1µF
105k
RUN
VIN
PWMIN OV/FB
ITH PWMOUT
SS
ILIM
VREF GATE
FBP SENSE
237k
M1
LED*
STRING
M2
10µF
FBN INTVCC
FREQ GND
4.7µF
10k 6k
SYNC
0.05Ω 12.4k
0.3Ω
M1, M2: SILICONIX Si4470EY *LUMILEDS LHXL-BW02
VOUT
<25V
COUT
10µF
GND
3783 TA01a
VPWMIN
5V/DIV
VOUT
0.2V/DIV
AC COUPLED
IL
2.5A/DIV
ILED
0.5A/DIV
Typical Waveforms
1µs/DIV
3783 TA01b
3783fb
1


Linear Technology Electronic Components Datasheet

LTC3783IFE Datasheet

Flyback and SEPIC Controller

No Preview Available !

LTC3783
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN, SENSE, FBP, FBN Voltages.................. –0.3V to 42V
INTVCC Voltage............................................. –0.3V to 9V
INTVCC Output Current........................................... 75mA
GATE Output Current.................................. 50mA (RMS)
PWMOUT Output Current........................... 25mA (RMS)
VREF Ouput Current.................................................. 1mA
GATE, PWMOUT Voltages........–0.3V to (VINTVCC + 0.3V)
ITH, ILIM, SS Voltages................................ –0.3V to 2.7V
RUN, SYNC, PWMIN Voltages..................... –0.3V to 7V
FREQ, VREF , OV/FB Voltages...................... –0.3V to 1.5V
Operating Temperature Range (Note 2)
LTC3783E.............................................. –40°C to 85°C
LTC3783I............................................ –40°C to 125°C
Junction Temperature (Note 3) ............. –40°C to 125°C
Storage Temperature Range
DFN Package...................................... –65°C to 125°C
TSSOP Package................................. –65°C to 150°C
Lead Temperature (Soldering, 10sec)
TSSOP Package................................................ 300°C
PIN CONFIGURATION
TOP VIEW
FBN 1
FBP 2
ILIM 3
VREF 4
FREQ 5
SYNC 6
PWMIN 7
PWMOUT 8
16 RUN
15 ITH
14 OV/FB
13 SS
17
12 SENSE
11 VIN
10 INTVCC
9 GATE
DHD PACKAGE
16-LEAD (5mm × 4mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FBN 1
FBP 2
ILIM 3
VREF 4
FREQ 5
SYNC 6
PWMIN 7
PWMOUT 8
16 RUN
15 ITH
14 OV/FB
13 SS
17
12 SENSE
11 VIN
10 INTVCC
9 GATE
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC3783EDHD#PBF
TAPE AND REEL
LTC3783EDHD#TRPBF
PART MARKING*
3783
PACKAGE DESCRIPTION
16-Lead (5mm × 4mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 85°C
LTC3783IDHD#PBF
LTC3783IDHD#TRPBF 3783
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3783EFE#PBF
LTC3783EFE#TRPBF
3783EFE
16-Lead Plastic TSSOP
–40°C to 85°C
LTC3783IFE#PBF
LTC3783IFE#TRPBF
3783IFE
16-Lead Plastic TSSOP
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3783EDHD
LTC3783IDHD
LTC3783EDHD#TR
3783
LTC3783IDHD#TR
3783
16-Lead (5mm × 4mm) Plastic DFN
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 85°C
–40°C to 125°C
LTC3783EFE
LTC3783EFE#TR
3783IFE
16-Lead Plastic TSSOP
–40°C to 85°C
LTC3783IFE
LTC3783IFE#TR
3783IFE
16-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3783fb
2


Part Number LTC3783IFE
Description Flyback and SEPIC Controller
Maker Linear
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LTC3783IFE Datasheet PDF






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