Datasheet > IS31LT3948-GRLS2

IS31LT3948-GRLS2

更新时间： 2024-11-12 01:22:51

品牌	Logo	应用领域
美国芯成 - ISSI		驱动
页数	文件大小	规格书
18页	446K
描述
PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS

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IS31LT3948-GRLS2 数据手册

IS31LT3948

PFM MODE BOOST LED DRIVER WITH THE EXTERNAL NMOS

February 2015

GENERAL DESCRIPTION

FEATURES

The IS31LT3948 is a PFM step-up DC-DC converter

designed for driving the white LED arrays for large

size LCD panel backlighting applications. It can

deliver stable constant output current from a few

milliamps up to 2A, programmed via an external

resistor.



Wide input voltage range: 5V~100V

Constant current output limited only by external

component selection (Note)

No loop compensation required

Internal over-voltage protection

Internal over-temperature protection

Operating temperature range -40C to +85C

(IS31LT3948-GRLS2-TR)

Operating temperature range -40C to +125C

(IS31LT3948-GRLS4-TR)



The IS31LT3948 utilizes a control scheme in which

the output is automatically adjusted to the optimum

output voltage for the system, maximizing the

efficiency. Furthermore, the control scheme is

inherently stable removing the need to provide

additional loop compensation.



SOP-8 package

Note: The maximum output current is determined by

_OUT/V_INratio as well as the external components. If

output current and V_OUT/V_INratio is high, high current

components of inductor and NMOS are needed.

The device features external PWM dimming, which

allows the flexible control of the back-lighting

luminance.

The IS31LT3948 has a wide input voltage range

from 5V to 100V (Note). An integrated OVP circuit

protects the chip and the system even under no-load

conditions.

APPLICATIONS



TV monitor backlighting

Notebook

Automotive

Street lamp

LED lighting

The chip is assembled in SOP-8 package. It

operates from 5V to 100V over two temperature

ranges of -40°C to +85°C and -40°C to +125°C.

Note: The IS31LT3948 has an internal 5V shunt

regulator connected to the VCC pin. A dropping

resistor must be connected between the VCC pin

and VIN to limit current flow. VIN voltages above

100V are allowed but care must be taken to ensure

that the output voltage remains greater than VIN,

and that the NMOS voltage rating is sufficiently

large.

TYPICAL APPLICATION CIRCUIT

Figure 1 Typical Application Circuit

Integrated Silicon Solution, Inc. – www.issi.com

Rev. D, 01/21/2015

12 3 4 5 6 7...18

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与IS31LT3948-GRLS2相关器件

型号	品牌	获取价格	描述	数据表
IS31LT3948-GRLS2-TR	ISSI	获取价格	IS31LT3948-GRLS2-TR
IS31LT3948-GRLS4-TR	ISSI	获取价格	LED Driver
IS31PW3500	ISSI	获取价格	1.1MHZ BOOST CONVERTER WITH 30V INTERNAL FET SWITCH
IS31PW8200	ISSI	获取价格	LI DUAL BATTERY CONTROLLER
IS31WV16100-70B	ISSI	获取价格	Pseudo Static RAM, 1MX16, 70ns, CMOS, PBGA48, 6 X 9 MM, MINI, FBGA-48
IS31WV16100A-70M	ISSI	获取价格	SRAM
IS31WV16100B-70B	ISSI	获取价格	Pseudo Static RAM, 1MX16, 70ns, CMOS, PBGA48, 6 X 8 MM, MINI, BGA-48
IS31WV16100B-70BI	ISSI	获取价格	Pseudo Static RAM, 1MX16, 70ns, CMOS, PBGA48, 6 X 8 MM, MINI, BGA-48
IS31WV16100B-70M	ISSI	获取价格	SRAM
IS31WV16200-70B	ISSI	获取价格	Pseudo Static RAM, 2MX16, 70ns, CMOS, PBGA48, 6 X 9 MM, MINI, FBGA-48

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