LT3598EFETRPBF datasheet(11/24 Pages) LINER

Part #	LT3598EFETRPBF

Description	6-String 30mA LED Driver with 1.5% Current Matching

Download	24 Pages

Scroll/Zoom	100%

Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

Logo

11 / 24 page

LT3598

11

3598fa

Overvoltage Protection

The LT3598 uses the FB pin to provide regulated overvoltage

protection when all LED strings are open. A resistor divider

is connected between the VO_SW pin and ground (Figure

2). There is an internal PMOS switch between VOUT and

VO_SW, which is controlled by the PWM signal. The PMOS

switch addition prevents the feedback resistor divider from

draining the output capacitor during PWM off-period, al-

lowing for a higher dimming range without falsely tripping

the OPENLED ﬂag. It also reduces the system current in

shutdown. This PMOS has about 1k resistance, so select

FB resistors taking this resistance into account.

To set the maximum output voltage, select the values

of R1 and R2 (see Figure 2) according to the following

equation:

VV

R

OUT MAX

()

.

=+

⎛

⎝⎜

⎞

⎠⎟

1 230

1

2

1

APPLICATIONS INFORMATION

Figure 2. Overvoltage Protection

Voltage Feedback Connections

The output voltage should be set higher than the normal

LED string operating voltage. Under normal operation,

LED1 to LED6 pin voltages are monitored and provide

feedback information to the converter for output volt-

age regulation given the programmed LED current. The

maximum output regulation loop is activated only when

all LEDs are open.

Programming Maximum LED Current

Maximum LED current is programmed by placing a resis-

tor between the ISET pin and ground (RISET). The ISET pin

resistor can be selected from 10k to 100k.

The LED current is programmed according to the follow-

ing equation:

I

V

R

LED

ISET

≈

294

See Table 4 and Figure 3 for resistor values and corre-

sponding programmed LED current.

LED current can also be adjusted by programming the

CTRL pin voltage.

Table 4. RISET Value Selection for LED Current

LED CURRENT (mA)

RESISTOR ON ISET PIN (k)

3mA

97.6

10mA

29.4

20mA

14.7

30mA

9.76

Figure 3. RISET Value Selection for LED Current

3598 F02

LT3598

VO_SW

FB

VOUT

R2

R1

RISET (k)

0

20

25

15

10

40

80

20

60

100

5

0

30

3598 F03

Similar Part No. - LT3598EFETRPBF

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT3598EUF-PBF	341Kb / 20P	6-String 30mA LED Driver with 1.5% Current Matching
Linear Technology	LT3598EUF-TRPBF	341Kb / 20P	6-String 30mA LED Driver with 1.5% Current Matching

More results

Similar Description - LT3598EFETRPBF

Manufacturer	Part #	Datasheet	Description
Linear Technology	LT3598	341Kb / 20P	6-String 30mA LED Driver with 1.5% Current Matching
Linear Technology	LT3598	407Kb / 24P	6-String 30mA LED Driver
Intersil Corporation	ISL97672_1011	531Kb / 17P	6-Channel LED Driver Current Matching 짹0.7%
Eutech Microelectronics...	EUP2990	681Kb / 1P	6 String White LED Driver
Monolithic Power System...	MP3386	315Kb / 14P	50V, 6 String White LED Driver
SHANGHAI BELLING CO., L...	BL9590	1Mb / 23P	Six-String White LED Driver with Active Current
ATMEL Corporation	MSL1060AW	2Mb / 20P	6-string PWM LED Driver with Digitally Compensated, 1.1MHz 48V Boost Regulator and 짹1.5% LED String Current Balance
Richtek Technology Corp...	RT8532	252Kb / 14P	6-String 43V White LED Driver with Boost Regulator January 2014
Power Analog Micoelectr...	PAM2846	956Kb / 14P	Integrated 6 String LED Boost Type Driver
Monolithic Power System...	EV3386DR-00A	214Kb / 4P	6 string White LED Driver Evaluation Board

More results

LT3598EFETRPBF Datasheet(PDF) 11 Page - Linear Technology

LT3598EFETRPBF Datasheet(HTML) 11 Page - Linear Technology

Similar Part No. - LT3598EFETRPBF

Similar Description - LT3598EFETRPBF

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

Datasheet Download

Link URL