ISL97682IRTZ-TK Intersil, ISL97682IRTZ-TK Datasheet

ISL97682IRTZ-TK

Manufacturer Part Number

ISL97682IRTZ-TK

Description

2 Channel LED Driver, 16LD TQFN 3X3, 1K T&R

Manufacturer

Intersil

Series

-r

Datasheet

1.ISL97682IRTZ.pdf (17 pages)

Specifications of ISL97682IRTZ-TK

Constant Current

Constant Voltage

Topology

PWM, Step-Up (Boost)

Number Of Outputs

Internal Driver

Yes

Type - Primary

Backlight

Type - Secondary

Frequency

500kHz ~ 650kHz, 900kHz ~ 1.1MHz

Voltage - Supply

4 V ~ 26.5 V

Voltage - Output

45V

Mounting Type

Surface Mount

Package / Case

16-WFQFN Exposed Pad

Operating Temperature

-40°C ~ 85°C

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ISL97682IRTZ-TK

Manufacturer:

INTERSIL

Quantity:

20 000

Company:

H&T Electronics

Part Number:

ISL97682IRTZ-TK

Quantity:

3 200

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Compact 2-3-4-Ch LED Drivers with Phase Shift Control

ISL97682, ISL97683, ISL97684

The ISL97682, ISL97683, ISL97684 are Intersil’s highly

integrated 2-3-4-channels LED drivers that are suitable for

medium size TFT-LCD backlights. These parts can drive multiple

channels of LEDs from inputs as low as 4V to outputs of up to

45V. They can also operate from inputs as low as 3V to outputs of

up to 26.5V in bootstrap configuration (see Figure 26 for 3V

operation).

The ISL97682, ISL97683, ISL97684 feature optional channels

phase shift control. This feature is used to minimize the input,

output ripple characteristics and load transient, which help

eliminate or reduce the video and audio noise interference from

the backlight driver operation.

The ISL97682, ISL97683, ISL97684 offer 8-bit PWM dimming for

systems that need frequency tuning flexibility. With the unique

adaptive boost switching architecture, the ISL97682, ISL97683,

ISL97684 also offer Direct PWM dimming with output, which

follows input and achieves linearity as low as 0.009% at 200Hz

or 1.35% at 30kHz.

The drivers incorporate dynamic headroom control that monitors

the highest LED forward voltage string and uses its feedback signal

for the minimum output regulation. The ISL97682, ISL97683,

ISL97684 incorporates extensive fault protection functions including

string open and short circuit detections, OVP, and OTP. The switching

frequency can be selected at either 600kHz or 1.0MHz in PFM or

PWM mode. These parts are available in the thin and compact

16 Ld 3mmx3mm TQFN package and operate in ambient

temperature from -40°C to +85°C.

March 11, 2011

FN7689.0

0.1µF

= 4~26.5V

10µF

1µF

FIGURE 1A. DIRECT PWM DIMMING

VIN

VDC

PWMI

RSET

FPWM/DIRECTPWM

FSW

COMP

AGND

ISL97684

10µH

PGND

OVP

CH1

CH2

CH3

CH4

LX 9

FIGURE 1. ISL97684 TYPICAL APPLICATION DIAGRAMS

GOOD LEDS MATCHING

> = 9V AND WITH

4.7µF

45V, 4 x 50mA*

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.

10µF

Features

• ISL97682 - 2 x 100mA Channels

• ISL97683 - 3 x 50mA Channels

• ISL97684 - 4 x 50mA Channels

• Input Voltage 4.0V~26.5V with Max V

• Input Voltage 3.0V (see Figure 26)~24V with Max V

• PWM Dimming Linearity

• Current Matching of 0.7% typical from 1%~100% Dimming

• Selectable 600kHz or 1MHz Switching Frequency in PWM/PFM

• Dynamic Headroom Control

• Fault Protection

• Thin and Compact TQFN-16 3mmx3mm Package

Applications

• Tablet to Notebook PC Displays LED Backlighting

• PMP LED Backlighting

- PWM Dimming with Adjustable Dimming Frequency with

- Direct PWM Dimming with Duty Cycle Linear from 0.009%

Mode

- String Open/Short Circuit Protections, OVP, OTP

0.1µF

Duty Cycle Linear from 0.4% to 100% <30kHz

to 100% at 200Hz

FIGURE 1B. PWM DIMMING WITH DIMMING FREQUENCY

All other trademarks mentioned are the property of their respective owners.

1µF

= 4~26.5V

VIN

VDC

PWMI

RSET

FPWM/DIRECTPWM

FSW

COMP

AGND

ADJUSTMENT USING R

ISL97684

10µH

PGND

CH1

CH2

CH3

CH4

OVP

LX 9

OUT

FPWM

GOOD LEDS MATCHING

of 45V

>=9V AND WITH

OUT

4.7µF

45V, 4 x 50mA*

of 26.5V

Related parts for ISL97682IRTZ-TK

ISL97682IRTZ-TK Summary of contents

Page 1

... FIGURE 1B. PWM DIMMING WITH DIMMING FREQUENCY CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 Intersil (and design trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. of 45V OUT of 26 ...

Page 2

... PART NUMBER (Notes ISL97682IRTZ 7682 ISL97683IRTZ 7683 ISL97684IRTZ 7684 ISL97682IRTZ-EVALZ Evaluation Board ISL97683IRTZ-EVAL Evaluation Board ISL97684IRTZ-EVALZ Evaluation Board NOTES: 1. Add “-T*” suffix for tape and reel. Please refer to These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte 2 ...

Page 3

ISL97682, ISL97683, ISL97684 Pin Configurations ISL97682 (16 LD TQFN) TOP VIEW AGND 1 COMP 2 RSET 3 FSW OVP 11 VDC 10 PGND ISL97684 (16 LD TQFN) ...

Page 4

ISL97682, ISL97683, ISL97684 Pin Descriptions PIN ISL97682 ISL97683 ISL97684 1 AGND AGND AGND 2 COMP COMP COMP 3 RSET RSET RSET 4 FSW FSW FSW 5 PWMI PWMI PWMI VIN VIN VIN 8 FPWM/ FPWM/ ...

Page 5

... Thermal Resistance (Typical TQFN (Notes Thermal Characterization (Typical TQFN (Note 6 Maximum Continuous Junction Temperature . . . . . . . . . . . . . . . . .+125°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp and θ thermal resistance ratings All specifications below are characterized at T CONDITION T = +25° ...

Page 6

ISL97682, ISL97683, ISL97684 Electrical Specifications unless otherwise noted. Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER DESCRIPTION D Boost Minimum Duty Cycle MIN F Boost Switching Frequency SW ILX_leakage LX Leakage Current REFERENCE I Channel-to-Channel ...

Page 7

ISL97682, ISL97683, ISL97684 Typical Performance Curves 4. (%) FIGURE 3. ISL97683 TYPICAL EFFICIENCY FOR 3P7S, ILED = ...

Page 8

ISL97682, ISL97683, ISL97684 Typical Performance Curves 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 MEASURED 0 0.8 1.6 2.4 DC (%) FIGURE 9. CURRENT LINEARITY vs LOW LEVEL PWM DIMMING DUTY CYCLE AT 12V FOR 4P10S AT 20mA/CH ...

Page 9

ISL97682, ISL97683, ISL97684 Typical Performance Curves V (1V/DIV) O ILED (20mA/DIV) FIGURE 15. LOAD REGULATION WITH ILED CHANGE FDROM 100 PWM DIMMING Vout OUT EN EN FIGURE 17. IN-RUSH AND LED CURRENT ...

Page 10

ISL97682, ISL97683, ISL97684 Theory of Operation PWM Boost Converter The current mode PWM boost converter produces the minimal voltage needed to enable the LED stack with the highest forward voltage drop to run at the programmed current. The ISL97682, ISL97683, ...

Page 11

ISL97682, ISL97683, ISL97684 Maximum DC Current Setting The initial brightness should be set by choosing an appropriate value for R . This should be chosen to fix the maximum SET possible LED current as shown in Equation 2 for ISL97682 ...

Page 12

Phase Shift Control The ISL97682, ISL97683, ISL97684 are capable of delaying the phase of each current source. Conventional LED drivers exhibit the worst load transients to the boost circuit by turning on all channels simultaneously as shown in Figures 20 ...

Page 13

ISL97682, ISL97683, ISL97684 Fault Protection and Monitoring The ISL97682, ISL97683, ISL97684 feature extensive protection functions to cover all the perceivable failure conditions. The failure mode of a LED can be either open circuit short. The behavior of ...

Page 14

ISL97682, ISL97683, ISL97684 VIN IMAX LOGIC I LIMIT VIN VSET/2 REG CASE FAILURE MODE DETECTION MODE 1 CH1 Short Circuit Over-Temperature Protection limit (OTP) not triggered and CH1 < 4.4V 2 CH1 Short Circuit OTP triggered but VCH1 < 4.4V ...

Page 15

ISL97682, ISL97683, ISL97684 Components Selections According to the inductor Voltage-Second Balance principle, the change of inductor current during the switching regulator On-time is equal to the change of inductor current during the switching regulator Off-time. Since the voltage across an ...

Page 16

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. ...

Page 17

ISL97682, ISL97683, ISL97684 Package Outline Drawing L16.3x3D 16 LEAD THIN QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 0, 3/10 3.00 6 PIN 1 INDEX AREA (4X) 0.15 TOP VIEW (2.80 TYP) ( 1.60) TYPICAL RECOMMENDED LAND PATTERN 17 4X 1.50 A ...

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