FEATURES

n

LTC3783

PWM LED Driver and Boost,

Flyback and SEPIC Controller

DESCRIPTION

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.

n

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

= 20µA

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

APPLICATIONS

n

High Voltage LED Arrays

Telecom Power Supplies

42V Automotive Systems

24V Industrial Controls

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 APPLICATION

350mA PWM LED Boost Application

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

237k

LED*

STRING

M2

C

OUT

10µF

×2

2.2µH

ZETEX ZLLS1000

V

PWMIN

5V/DIV

V

OUT

<25V

V

OUT

0.2V/DIV

AC COUPLED

I

L

2.5A/DIV

Typical Waveforms

105k

0.1µF

10µF

10k

6k

M1

4.7µF

0.05

12.4k

0.3

GND

I

LED

0.5A/DIV

1µs/DIV

3783 TA01b

3783 TA01a

M1, M2: SILICONIX Si4470EY

*LUMILEDS LHXL-BW02

3783fb

1

LTC3783

ABSOLUTE MAXIMUM RATINGS

(Note 1)

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

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

FBP

I

LIM

V

REF

FREQ

SYNC

PWMIN

PWMOUT

1

2

3

4

5

6

7

8

17

16 RUN

15 I

TH

14 OV/FB

13 SS

12 SENSE

11 V

IN

10 INTV

CC

9

GATE

FBN

FBP

I

LIM

V

REF

FREQ

SYNC

PWMIN

PWMOUT

1

2

3

4

5

6

7

8

17

TOP VIEW

16 RUN

15 I

TH

14 OV/FB

13 SS

12 SENSE

11 V

IN

10 INTV

CC

9

GATE

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

T

JMAX

= 125°C,

θ

JA

= 38°C/W

EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LTC3783EDHD#PBF

LTC3783IDHD#PBF

LTC3783EFE#PBF

LTC3783IFE#PBF

LEAD BASED FINISH

LTC3783EDHD

LTC3783IDHD

LTC3783EFE

LTC3783IFE

TAPE AND REEL

LTC3783EDHD#TRPBF

LTC3783IDHD#TRPBF

LTC3783EFE#TRPBF

LTC3783IFE#TRPBF

TAPE AND REEL

LTC3783EDHD#TR

LTC3783IDHD#TR

LTC3783EFE#TR

LTC3783IFE#TR

PART MARKING*

3783

3783EFE

3783IFE

PART MARKING*

3783

3783IFE

PACKAGE DESCRIPTION

16-Lead (5mm

×

4mm) Plastic DFN

16-Lead (5mm

×

4mm) Plastic DFN

16-Lead Plastic TSSOP

PACKAGE DESCRIPTION

16-Lead (5mm

×

4mm) Plastic DFN

16-Lead (5mm

×

4mm) Plastic DFN

16-Lead Plastic TSSOP

TEMPERATURE RANGE

–40°C to 85°C

–40°C to 125°C

–40°C to 85°C

–40°C to 125°C

TEMPERATURE RANGE

–40°C to 85°C

–40°C to 125°C

–40°C to 85°C

–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

LTC3783

ELECTRICAL CHARACTERISTICS

SYMBOL

V

IN

I

Q

V

RUN+

V

RUN–

V

RUN(HYST)

I

RUN

V

SENSE(MAX)

I

SENSE(ON)

I

SENSE(OFF)

I

SS

V

REF

I

REF

∆V

REF

/∆V

IN

∆V

REF

/∆I

REF

T

MAX

T

HYST

Error Amplifier

I

OV/FB

∆V

OV/FB(OV)

V

OV/FB(FB)

I

FBP

, I

FBN

V

FBP

– V

FBN

g

m

A

VOL

Oscillator

f

OSC

D

MAX

f

SYNC

/f

OSC

t

SYNC(MIN)

t

SYNC(MAX)

V

IH(SYNC)

V

HYST(SYNC)

Oscillator Frequency

Oscillator Frequency Range

Maximum Duty Cycle

Recommended Max SYNC Freq Ratio

SYNC Minimum Input Pulse Width

SYNC Maximum Input Pulse Width

SYNC Input Voltage High Level

SYNC Input Voltage Hysteresis

f

OSC

= 300kHz (Note 6)

V

SYNC

= 0V to 5V

V

SYNC

= 0V to 5V

1.2

0.5

R

FREQ

= 20kΩ

250

20

85

300

90

1.25

25

0.8/f

OSC

350

1000

97

1.3

ns

V

3783fb

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.

,

PARAMETER

Input Voltage Range

Input Voltage Supply Current

Continuous Mode

Shutdown Mode

Rising RUN Input Threshold Voltage

Falling RUN Input Threshold Voltage

RUN Pin Input Threshold Hysteresis

RUN Pin Input Current

Maximum Current Sense Threshold

SENSE Pin Current (GATE High)

SENSE Pin Current (GATE Low)

Soft-Start Pin Output Current

Reference Voltage

l

CONDITIONS

MIN

3

TYP

MAX

36

UNITS

V

mA

µA

V

Main Control Loop/Whole System

(Note 4)

V

OV/FB

= 1.5V, V

ITH

= 0.75V

V

RUN

= 0V

1.223

1.5

20

1.348

1.248

100

5

125

150

70

0.2

-50

1.218

1.212

0.5

1.230

1.242

1.248

0.02

1.0

180

1.273

V

mV

nA

mV

µA

V

mA

%/V

%/mA

°C

V

SENSE

= 0V

V

SENSE

= 36V

V

SS

= 0V

Voltage/Temperature Reference

Max Reference Pin Output Current

Reference Voltage Line Regulation

Reference Voltage Load Regulation

Overtemperature SD Threshold Rising

Overtemperature Hysteresis

OV/FB Pin Input Current

OV/FB Overvoltage Lockout Threshold V

OV/FB(OV)

– V

OV/FB(NOM)

in %, V

FBP

≤ V

REF

OV/FB Pin Regulation Voltage

Error Amplifier Input Current

Error Amplifier Offset Voltage

(Note 5)

Error Amplifier Transconductance

Error Amplifier Open-Loop Gain

2.5V < V

FBP

< 36V

0V ≤ V

FBP

≤ V

REF

2.5V < V

FBP

< 36V

0V ≤ V

FBP

≤ V

REF

2.5V < V

FBP

≤ 36V (V

ILIM

= V

REF

)

2.5V < V

FBP

≤ 36V (V

ILIM

= 0.123V)

V

FBP

≤ V

REF

2.5V < V

FBP

< 36V

3V ≤ V

IN

≤ 36V

0mA ≤ I

REF

≤ 0.5mA

0.002

0.2

165

25

18

7

1.212

1.230

–0.4

50

–3

100

10

1.7

14

500

60

1.248

nA

%

V

µA

3

mV

mmho

V/V

kHz

%

3

LTC3783

ELECTRICAL CHARACTERISTICS

SYMBOL

R

SYNC

t

ON(MIN)

PARAMETER

SYNC Input Pull-Down Resistance

Minimum On-Time

With Sense Resistor, 10mV Overdrive

No R

SENSE

Mode

V

OV/FB

= 1.5V

Rising INTV

CC

Falling INTV

CC

Hysteresis

12V ≤ V

IN

≤ 36V

0 ≤ I

INTVCC

≤ 10mA

V

IN

= 7V, I

INTVCC

= 10mA

V

SENSE

= 0V

V

SENSE

= 7V

C

L

= 3300pF (Note 7)

C

L

= 3300pF (Note 7)

V

GATE

= 0V

V

GATE

= 7V

Rising PWMIN

Falling PWMIN

Hysteresis

C

L

= 3300pF (Note 7)

C

L

= 3300pF (Note 7)

V

PWMOUT

= 0V

V

PWMOUT

= 7V

–1

l

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.

,

CONDITIONS

MIN

TYP

100

170

300

6.5

1.8

7

2.3

2.1

0.2

2

–0.1

300

25

15

8

0.5

1

1.6

0.8

100

30

16

0.25

0.50

500

7.5

2.5

MAX

UNITS

kΩ

ns

V

mV/V

%

mV

µA

ns

A

V

kΩ

ns

A

Low Dropout Regulator

V

INTVCC

UVLO

INTV

CC

Regulator Output Voltage

INTV

CC

Undervoltage Lockout

Thresholds

INTV

CC

Line Regulation

INTV

CC

Load Regulation

INTV

CC

Dropout Voltage

Bootstrap Mode INTV

CC

Supply

Current in Shutdown

GATE Driver Output Rise Time

GATE Driver Output Fall Time

GATE Driver Peak Current Sourcing

GATE Driver Peak Current Sinking

PWMIN Pin Input Threshold Voltages

∆V

INTVCC

∆V

IN

∆V

LDO(LOAD)

V

DROPOUT

I

INTVCC(SD)

6

GATE/PWMOUT Drivers

t

r(GATE)

t

f(GATE)

I

PK(GATE,RISE)

I

PK(GATE,FALL)

V

PWMIN

R

PWMIN

t

r(PWMOUT)

t

f(PWMOUT)

I

PK(PWMOUT,RISE)

I

PK(PWMOUT,FALL)

PWMIN Input Pull-Up Resistance

PWMOUT Driver Output Rise Time

PWMOUT Driver Output Fall Time

PWMOUT Driver Peak Current Sourcing

PWMOUT Driver Peak Current Sinking

Note 1:

Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2:

The LTC3783E is guaranteed to meet performance specifications

over the 0°C to 85°C operating temperature range. Specifications over

the –40°C to 85°C operating temperature range are assured by design,

characterization and correlation with statistical process controls. The

LTC3783I is guaranteed to meet performance specifications over the full

–40°C to 125°C operating temperature range.

Note 3:

T

J

is calculated from the ambient temperature T

A

and power

dissipation P

D

according to the following formula:

T

J

= T

A

+ (P

D

• 43°C/W) for the DFN

T

J

= T

A

+ (P

D

• 38°C/W) for the TSSOP

Note 4:

The dynamic input supply current is higher due to power MOSFET

gate charging (Q

G

• f

OSC

). See Operation section.

Note 5:

The LTC3783 is tested in a feedback loop which servos V

FBN

to

V

FBP

= V

VREF

with the I

TH

pin forced to the midpoint of its voltage range

(0.3V ≤ V

ITH

≤ 1.2V; midpoint = 0.75V).

Note 6:

In a synchronized application, the internal slope compensation is

increased by 25%. Synchronizing to a significantly higher ratio will reduce

the effective amount of slope compensation, which could result in sub-

harmonic oscillation for duty cycles greater than 50%

Note 7:

Rise and fall times are measured at 10% and 90% levels.

3783fb

4

LTC3783

TYPICAL PERFORMANCE CHARACTERISTICS

1.25

T

A

= 25°C unless otherwise specified

V

REF

vs Temperature

1.235

1.233

V

REF

Line Regulation

1.235

V

REF

Load Regulation

1.20

1.233

V

REF

(V)

V

REF

(V)

V

REF

(V)

1.15

1.231

1.229

1.231

V

IN

= 12V

V

IN

= 2.5V

1.10

1.05

1.229

1.227

1.00

–50

0

50

100

TEMPERATURE (°C)

150

3783 G01

1.225

0

10

20

V

IN

(V)

30

40

3783 G02

1.225

0

1

3

2

I

REF

(mA)

4

5

3783 G03

I

Q

vs Temperature (PWMIN Low)

1.6

1.4

1.2

1.0

I

Q

(mA)

0.8

0.6

0.4

0.2

0

–75

–25

125

75

TEMPERATURE (°C)

25

175

3783 G04

I

Q

vs V

IN

(PWMIN Low)

2.0

1.9

1.8

DYNAMIC I

Q

(mA)

1.7

I

Q

(mA)

1.6

1.5

1.4

1.3

1.2

1.1

0

10

30

20

V

IN

(V)

40

50

3783 G05

Dynamic I

Q

vs Frequency

30

25

20

15

10

5

0

C

L

= 3300pF

I

Q(TOT)

= 1.3mA + Q

G

• f

0

0.5

1

FREQUENCY (MHz)

1.5

3783 G06

1.6

1.5

1.4

RUN THRESHOLDS (V)

1.3

1.2

1.1

1.0

0.9

0.8

0.7

0.6

RUN Thresholds vs V

IN

RUN HIGH

RUN THRESHOLDS (V)

RUN Thresholds vs Temperature

1.40

1.38

1.36

1.34

R

T

(k )

10

RUN LOW

1

0

100

TEMPERATURE (°C)

50

150

3783 G08

1000

RUN HIGH

100

R

T

vs Frequency

RUN LOW

1.32

1.30

1.28

1.26

1.24

0

10

20

V

IN

(V)

30

40

3783 G07

1.22

–50

1

10

100

1000

FREQUENCY (kHz)

10000

3783 G09

3783fb

5

参数名称	属性值
是否Rohs认证	不符合
厂商名称	ADI(亚德诺半导体)
包装说明	HVSON,
Reach Compliance Code	not_compliant
ECCN代码	EAR99
其他特性	IT CAN ALSO OPERATES AT CURRENT MODE
模拟集成电路 - 其他类型	SWITCHING CONTROLLER
控制模式	VOLTAGE-MODE
控制技术	PULSE WIDTH MODULATION
最大输入电压	36 V
最小输入电压	3 V
标称输入电压	12 V
JESD-30 代码	R-PDSO-N16
JESD-609代码	e0
长度	5 mm
湿度敏感等级	1
功能数量	1
端子数量	16
最高工作温度	85 °C
最低工作温度
最大输出电流	1 A
封装主体材料	PLASTIC/EPOXY
封装代码	HVSON
封装形状	RECTANGULAR
封装形式	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）	235
认证状态	Not Qualified
座面最大高度	0.8 mm
表面贴装	YES
切换器配置	SINGLE
最大切换频率	1000 kHz
温度等级	OTHER
端子面层	Tin/Lead (Sn/Pb)
端子形式	NO LEAD
端子节距	0.5 mm
端子位置	DUAL
处于峰值回流温度下的最长时间	20
宽度	4 mm

	LTC3783EDHD#TR	LTC3783EFE#TR
描述	Switching Voltage Regulators LTC3783 - PWM LED Driver and Boost, Flyback and SEPIC Converter	Switching Voltage Regulators LTC3783 - PWM LED Driver and Boost, Flyback and SEPIC Converter
是否Rohs认证	不符合	不符合
厂商名称	ADI(亚德诺半导体)	ADI(亚德诺半导体)
包装说明	HVSON,	HTSSOP,
Reach Compliance Code	not_compliant	not_compliant
ECCN代码	EAR99	EAR99
其他特性	IT CAN ALSO OPERATES AT CURRENT MODE	IT CAN ALSO OPERATES AT CURRENT MODE
模拟集成电路 - 其他类型	SWITCHING CONTROLLER	SWITCHING CONTROLLER
控制模式	VOLTAGE-MODE	VOLTAGE-MODE
控制技术	PULSE WIDTH MODULATION	PULSE WIDTH MODULATION
最大输入电压	36 V	36 V
最小输入电压	3 V	3 V
标称输入电压	12 V	12 V
JESD-30 代码	R-PDSO-N16	S-PDSO-G16
JESD-609代码	e0	e0
长度	5 mm	5 mm
湿度敏感等级	1	1
功能数量	1	1
端子数量	16	16
最高工作温度	85 °C	85 °C
最大输出电流	1 A	1 A
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	HVSON	HTSSOP
封装形状	RECTANGULAR	SQUARE
封装形式	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	SMALL OUTLINE, HEAT SINK/SLUG, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）	235	235
认证状态	Not Qualified	Not Qualified
座面最大高度	0.8 mm	1.1 mm
表面贴装	YES	YES
切换器配置	SINGLE	SINGLE
最大切换频率	1000 kHz	1000 kHz
温度等级	OTHER	OTHER
端子面层	Tin/Lead (Sn/Pb)	Tin/Lead (Sn/Pb)
端子形式	NO LEAD	GULL WING
端子节距	0.5 mm	0.65 mm
端子位置	DUAL	DUAL
处于峰值回流温度下的最长时间	20	20
宽度	4 mm	4.4 mm

LTC3783EDHD#TR

LTC3783EDHD#TR概述

LTC3783EDHD#TR规格参数

文档预览

LTC3783EDHD#TR相似产品对比

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