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LTC3783IFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LTC3783
1
3783fb
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
PWM LED Driver and Boost,
Flyback and SEPIC Controller
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 V
IN
, optional constant current/constant voltage regula-
tion 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’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.
350mA PWM LED Boost Application
n
True Color PWM
TM
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: I
Q
= 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 1.3f
OSC
n
Internal 7V Low Dropout Voltage Regulator
n
Programmable Output Overvoltage Protection
n
Programmable Soft-Start
n
Can be Used in a No R
SENSE
TM
Mode for V
DS
< 36V
n
16-Lead DFN and TSSOP Packages
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 R
SENSE
are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Typical Waveforms
LTC3783
1M
RUN
PWMIN
I
TH
SS
V
REF
FBP
FBN
FREQ
SYNC
V
IN
OV/FB
PWMOUT
I
LIM
GATE
SENSE
INTV
CC
GND
LED*
STRING
V
IN
6V TO 16V
(< TOTAL V
F
OF LEDs)
GND
M1
M1, M2: SILICONIX Si4470EY
10µF
×2
ZETEX ZLLS1000
M2
C
OUT
10µF
V
OUT
<25V
*LUMILEDS LHXL-BW02
3783 TA01a
0.1µF
10k 6k
105k
10µF
2.2µH
4.7µF
0.05Ω
237k
12.4k 0.3Ω
V
PWMIN
5V/DIV
I
L
2.5A/DIV
I
LED
0.5A/DIV
V
OUT
0.2V/DIV
AC COUPLED
1µs/DIV
3783 TA01b
LTC3783
2
3783fb
ABSOLUTE MAXIMUM RATINGS
V
IN
, SENSE, FBP, FBN Voltages ................. –0.3V to 42V
INTV
CC
Voltage ............................................ –0.3V to 9V
INTV
CC
Output Current .......................................... 75mA
GATE Output Current
................................. 50mA (RMS)
PWMOUT Output Current
.......................... 25mA (RMS)
V
REF
Ouput Current ................................................. 1mA
GATE, PWMOUT Voltages
.......–0.3V to (V
INTVCC
+ 0.3V)
I
TH
, I
LIM
, SS Voltages ............................... –0.3V to 2.7V
RUN, SYNC, PWMIN Voltages..................... –0.3V to 7V
FREQ, V
REF
, OV/FB Voltages ..................... –0.3V to 1.5V
(Note 1)
16
15
14
13
12
11
10
9
17
1
2
3
4
5
6
7
8
RUN
I
TH
OV/FB
SS
SENSE
V
IN
INTV
CC
GATE
FBN
FBP
I
LIM
V
REF
FREQ
SYNC
PWMIN
PWMOUT
TOP VIEW
DHD PACKAGE
16-LEAD (5mm × 4mm) PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
FBN
FBP
I
LIM
V
REF
FREQ
SYNC
PWMIN
PWMOUT
RUN
I
TH
OV/FB
SS
SENSE
V
IN
INTV
CC
GATE
17
T
JMAX
= 125°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3783EDHD#PBF LTC3783EDHD#TRPBF 3783
16-Lead (5mm × 4mm) Plastic DFN
–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 LTC3783EDHD#TR 3783
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 85°C
LTC3783IDHD LTC3783IDHD#TR 3783
16-Lead (5mm × 4mm) Plastic DFN
–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/
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
LTC3783
3
3783fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop/Whole System
V
IN
Input Voltage Range 3 36 V
I
Q
Input Voltage Supply Current
Continuous Mode
Shutdown Mode
(Note 4)
V
OV/FB
= 1.5V, V
ITH
= 0.75V
V
RUN
= 0V
1.5
20
mA
µA
V
RUN
+
Rising RUN Input Threshold Voltage 1.348 V
V
RUN
–
Falling RUN Input Threshold Voltage 1.223 1.248 1.273 V
V
RUN(HYST)
RUN Pin Input Threshold Hysteresis 100 mV
I
RUN
RUN Pin Input Current 5 nA
V
SENSE(MAX)
Maximum Current Sense Threshold 125 150 180 mV
I
SENSE(ON)
SENSE Pin Current (GATE High) V
SENSE
= 0V 70 µA
I
SENSE(OFF)
SENSE Pin Current (GATE Low) V
SENSE
= 36V 0.2 µA
I
SS
Soft-Start Pin Output Current V
SS
= 0V -50 µA
Voltage/Temperature Reference
V
REF
Reference Voltage
l
1.218
1.212
1.230 1.242
1.248
V
V
I
REF
Max Reference Pin Output Current 0.5 mA
∆V
REF
/∆V
IN
Reference Voltage Line Regulation 3V ≤ V
IN
≤ 36V 0.002 0.02 %/V
∆V
REF
/∆I
REF
Reference Voltage Load Regulation 0mA ≤ I
REF
≤ 0.5mA 0.2 1.0 %/mA
T
MAX
Overtemperature SD Threshold Rising 165 °C
T
HYST
Overtemperature Hysteresis 25 °C
Error Amplifier
I
OV/FB
OV/FB Pin Input Current 18 60 nA
∆V
OV/FB(OV)
OV/FB Overvoltage Lockout Threshold V
OV/FB(OV)
– V
OV/FB(NOM)
in %, V
FBP
≤ V
REF
7 %
V
OV/FB(FB)
OV/FB Pin Regulation Voltage 2.5V < V
FBP
< 36V 1.212 1.230 1.248 V
I
FBP
, I
FBN
Error Amplifier Input Current 0V ≤ V
FBP
≤ V
REF
2.5V < V
FBP
< 36V
–0.4
50
µA
µA
V
FBP
– V
FBN
Error Amplifier Offset Voltage
(Note 5)
0V ≤ V
FBP
≤ V
REF
2.5V < V
FBP
≤ 36V (V
ILIM
= V
REF
)
2.5V < V
FBP
≤ 36V (V
ILIM
= 0.123V)
–3
100
10
3 mV
mV
mV
g
m
Error Amplifier Transconductance V
FBP
≤ V
REF
2.5V < V
FBP
< 36V
1.7
14
mmho
mmho
A
VOL
Error Amplifier Open-Loop Gain 500 V/V
Oscillator
f
OSC
Oscillator Frequency
Oscillator Frequency Range
R
FREQ
= 20kΩ 250
20
300 350
1000
kHz
kHz
D
MAX
Maximum Duty Cycle 85 90 97 %
f
SYNC
/f
OSC
Recommended Max SYNC Freq Ratio f
OSC
= 300kHz (Note 6) 1.25 1.3
t
SYNC(MIN)
SYNC Minimum Input Pulse Width V
SYNC
= 0V to 5V 25 ns
t
SYNC(MAX)
SYNC Maximum Input Pulse Width V
SYNC
= 0V to 5V 0.8/f
OSC
ns
V
IH(SYNC)
SYNC Input Voltage High Level 1.2 V
V
HYST(SYNC)
SYNC Input Voltage Hysteresis 0.5 V
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are T
A
= 25°C. V
IN
= 12V, V
RUN
= 1.5V, V
SYNC
= 0V, V
FBP
= V
REF
, R
T
= 20k, unless otherwise specified.
ELECTRICAL CHARACTERISTICS
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LTC3783IFE#TRPBF

Mfr. #:
Buy LTC3783IFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators PWM LED Drvr & Boost, Fly & SEPIC Conv
Lifecycle:
New from this manufacturer.
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