LT1373HVIS8#PBF datasheet, PDF

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LT1373HVIS8#PBF: DescriptionIC REG MULT CONFIG INV ADJ 8SOIC; CategoryPower/power management The power supply circuit; File Size347KB，10 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html; Environmental Compliance

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LT1373HVIS8#PBF Overview

IC REG MULT CONFIG INV ADJ 8SOIC

LT1373HVIS8#PBF Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	conform to
Maker	Linear ( ADI )
Parts packaging code	SOIC
package instruction	SOP, SOP8,.25
Contacts	8
Manufacturer packaging code	S8
Reach Compliance Code	compliant
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING REGULATOR
control mode	CURRENT-MODE
Control Technology	PULSE WIDTH MODULATION
Maximum input voltage	25 V
Minimum input voltage	2.7 V
Nominal input voltage	5 V
JESD-30 code	R-PDSO-G8
JESD-609 code	e3
length	4.9 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	8
Maximum output current	1.5 A
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Encapsulate equivalent code	SOP8,.25
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	260
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Switch configuration	BOOST
Maximum switching frequency	275 kHz
technology	BIPOLAR
Terminal surface	Matte Tin (Sn)
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	30
width	3.9 mm

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QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 515

CCFL POWER SUPPLY

LT1373

DESCRIPTION

Demonstration Circuit 515 is a single output CCFL

inverter with dimming and over-voltage protection

features. The inverter consists of a LT1373 and a

Royer converter that uses bipolar transistors. The

featured LT1373 limits its switch current to 1.5A,

which protects against CCFL short circuit conditions.

The Royer topology is very flexible in that it operates

over wide supply ranges, and it scales well over a

broad output power range while keeping component

count low. DC515 is most suitable for 2W–6W CCFL

applications such as point-of-sale terminals and

automotive LCD displays.

DC515 is designed to operate for a V

range of 5V–

20V and outputs hundreds of volts at mA current lev-

els.

Dimming can be achieved by either an analog signal

or a PWM signal applied to the Vprog terminal, or by

adjusting a potentiometer. The over-voltage protec-

tion feature (when enabled) protects the Royer trans-

former from excessive high voltages when the CCFL

is not connected to the output.

Design files for this circuit board are available.

Call the LTC factory.

QUICK START PROCEDURE

DC515 is easy to set up to evaluate the performance

of the LT1373. Refer to Figure 1 for proper meas-

urement equipment setup and follow the procedure

below:

Connect the LCD\CCFL across the CCFL – and +

NOTE:

5V–8V input may be too low a voltage for

some LCDs\CCFLs that have unusual characteris-

tics. If one such LCD is being used contact the

LTC Applications Department for directions on how

the board can be modified to operate down to 5V.

terminals E5 and E6. Connect the positive CCFL

wire to E5 and the negative terminal of the CCFL

to E6.

Warning:

There may be

thousands of volts

across

the CCFL – and + terminals, across the capacitor

C1, and on the secondary side of the transformer

T1.

These high voltages can be very harmful to

anyone who touches these points.

Ground the LCD Casing.

Apply 8V–20V to the Vin and Gnd terminals.

Carefully adjust R2 until the CCFL current equals

the maximum current for which the CCFL is speci-

fied.

Apply the system V

PROG

supply to the Vprog ter-

minal. Set the V

PROG

voltage to its specified

maximum (5V is the limit). Adjust R8 until zero cur-

rent flows in the CCFL. CCFL current can now be

adjusted over its full range by adjusting V

PROG

over its full range.

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