Intersil ISL97684 Manuale utente

Application Note 1668

ISL97684 LED Driver Evaluation Board User Manual

Introduction

The ISL97684 Evaluation Board provides a complete testing

platform for ISL97684, a four channel LED driver. Please refer

to the product datasheet for detailed information, including

pinout, pin function descriptions, electrical specifications and

applications related information.

Instructions

Please follow the steps described below to start your

evaluation.

1. Set Switch #1 and Switch #2 (SW1 and SW2) to position 3

(left side).

2. For the enable control jumper, JP1, set the shunt to the

“ON” position (right side) to connect the EN pin to VIN.

When the shunt is in the “OFF” position, it will disable the

chip by pulling the EN pin to ground.

3. Connect JP14 so the VIN pin is connected to PVIN.

4. For JP20, connect the shunt to the upper position.

5. Connect WR and JP2-JP6.

6. Apply 1.5V~5.5V PWM signal between the PWMI pin and

AGND.

7. Apply 4V~26.5V between PVIN and PGND and the LEDs

should be lit. You may start the evaluation.

Note:

• In Step #1 above, the SW1, SW2 position can be adjusted to

different positions for different configurations. Details are

provided in the following:

• The LED maximum DC current adjustment

For each channel, the maximum DC current is set by

resistance connected to the RSET pin. The current for each

channel can be calculated as follows:

On the board, a potentiometer R5 and a few other resistors

are provided for easily adjusting the LED maximum DC

current; please refer to the evaluation board schematic on

page 2 for more details.

• LED dimming frequency and duty cycle

1. As mentioned in Step #4, when the shunt on JP20 is

connected to the upper position and the FPWM/DPWM pin

is connected to VDC, the device enters direct PWM mode,

which means both the LED dimming frequency and the

duty cycle are synchronized with the external PWM signal

applied on the PWMI pin.

2. When the shunt on JP20 is connected to the lower position,

the FPWM/DPWM pin is connected to a resistor. Under

such conditions, the LED dimming frequency of the chip is

programmed by the resistance connected on the

FPWM/DPWM pin per the following equation:

The duty cycle is still modulated by the external PWM signal

applied on the PWMI pin. On board, a potentiometer R11

and a few other resistors are provided for easily adjusting

the LED dimming frequency under such configuration.

TABLE 1.

SW1

POSITION

SW2

POSITION DESCRIPTION

1 1 LX switching frequency = 600kHz, PFM

CH1-CH4

3 3 LX switching frequency = 1MHz, PFM

CH1-CH4

3 1 LX switching frequency = 600kHz, No PFM

CH1-CH4

1 3 LX switching frequency = 1MHz, No PFM

CH1-CH4

I_LED(mA) 402 RSET⁄kΩ〈〉=(EQ. 1)

FPWM Hz()12.4 7

×10 R_FPWM Ω()⁄=(EQ. 2)

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

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

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

December 13, 2011

AN1668.0

Application Note 1668

2AN1668.0

December 13, 2011

Title

Number RevisionSize

Date: 11-Oct-2011 Sheet of

File: C:\ISL97682_3_4\ISL97682EVAL1Z_RevA.ddbDrawn By:

L1 15uH D1

PMEG6030

1 3

SW1

1 3

SW2

150k

100k

When

SW1=SW2=1: Fsw=1.2MHz, WITH phase shift

SW1=SW2=3: Fsw=600KHz, WITH phase shift

SW1=1, SW2=3: Fsw=1.2MHz, WITHOUT phase shift

SW1=3, SW2=1: Fsw=600KHz, WITHOUT phase shift

10uF/35V

0.1uF/50V

PVIN

1uF/16V

PWMI

VDC

4.7uF/50V

LED1 LED13 LED25 LED37

LED2 LED14 LED26 LED38

LED3 LED15 LED27 LED39

LED4 LED16 LED28 LED40

LED5 LED17 LED29 LED41

LED6 LED18 LED30 LED42

LED7 LED19 LED31 LED43

LED8 LED20 LED32 LED44

LED9 LED21 LED33 LED45

LED10 LED22 LED34 LED46

LED11 LED23 LED35 LED47

LED12 LED24 LED36 LED48

JP2

I_OUT

JP3 JP4 JP5 JP6

10k

357k

C10

3.3nF/50V

100pF/50V

JP7 JP8 JP9 JP10

JP11 JP12 JP13

C14

1nF/50V

C13

1nF/50V

C12

1nF/50V

C11

1nF/50V

open

10k

C15

8.2nF

33PF

TP1

TP2

VOUT

TP3

CH1

TP4

CH2

TP5

CH3

TP6

CH4

TP7

VDC

AGND

PGND

P10

PGND

2-layer board. Connect top layer PGND and bottom

layer AGND at one single point through the via on

the thermal pad under the chip.

2A Fuse

JP14

R11

100k

R10

R13

Open

R12

27k

JP15 JP16 JP17 JP18

ISL97684EVAL1Z Rev. A

EN can be connected in the following ways to

enable/disable the device:

(1) Connected it to VIN directly on JP1 to enable

(2) Connected it to GND directly on JP1 to disable

(3) Directly apply external voltage on P3(EN) to

enable/disable the device without putting shunt on JP1.

JP2: For measuring total output current

JP3-JP6: For measuring current on CH1-CH4 respectively

JP7-JP10, JP13-JP16: For easy configuration of 8x LED or 10x

LED per string

JP19

TP8

RSET

TP9

FSW/PHS

VIN

VDC

1 3

JP1

JP20

VDC

CH4 16

AGND 1

COMP 2

RSET 3

FSW/PHS 4

PWMI

VIN

FPWN/DPWM

PGND

VDC

OVP

CH1 13

CH2 14

CH3 15

ISL97684

XAL6060-153MEB

Error : intersil.bmp file not found.

FIGURE 1. EVALUATION BOARD SCHEMATIC

Application Note 1668

3AN1668.0

December 13, 2011

PCB Layout

FIGURE 2. TOP SILKSCREEN LAYER AND TOP LAYER

Application Note 1668

4AN1668.0

December 13, 2011

FIGURE 3. BOTTOM LAYER

PCB Layout (Continued)

Application Note 1668

5AN1668.0

December 13, 2011

Bill of Materials

DESIGNATOR PART TYPE FOOTPRINT PART MANUFACTURER/NUMBER

R1 150k 603 1% SMD Resistor

R2 100k 603 General purpose

R3 357k 603 

R4 10k 603 

R5 1M VRES 

R6 0 603 

R7 Open 603 

R8 5k 603 

R9 10k 603 

R10 0 603 

R11 100k VRES 

R12 0 603 

R13 Open 603 

L1 15µH CoilCraft (XAL6060-153MEB)

D1 PMEG6030

C1 10µF/35V 1210 General purpose

C2 0.1µF/50V 603 Ceramic X5R/X7R capacitors

C3 33pF 603 

C4 1µF/16V 603 

C5 4.7µF/50V 1210 Murata, GRM32ER71H475KA88L

C6 4.7µF/50V 1210 

C7 Place Holder 1210 Not Populated

C8 Place Holder 1210 

C9 100pF/50V 603 General purpose

C10 3.3nF/50V 603 Ceramic X5R/X7R capacitors

C11 1nF/50V 603 

C12 1nF/50V 603 

C13 1nF/50V 603 

C14 1nF/50V 603 

C15 8.2nF 603 

F1 2A Fuse 1206 Bel Fuse Inc, C1Q 2

U1 QFN16 3MM Intersil, ISL97682/3/4

JP2-JP19 JUMPER-2PIN JUMPER-2PIN FCI

WR JUMPER-2PIN JUMPER-2PIN 68000-236HLF-1x2

JP1 JUMPER-3PIN JUMPER-3PIN FCI

JP20 JUMPER-3PIN JUMPER-3PIN 68000-236HLF-1x3

LED1-12 LED25-36 LED-SMT LW_Y87C 

TP1 LX TEST POINT Keystone Electronics

TP2 VOUT TEST POINT 5010

Application Note 1668

Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is

cautioned to verify that the Application Note or Technical Brief is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

AN1668.0

December 13, 2011

TP3 CH1 TEST POINT 

TP4 CH2 TEST POINT

TP5 CH3 TEST POINT

TP6 CH4 TEST POINT

TP7 VDC TEST POINT 

TP8 RSET TEST POINT 

TP9 FSW/PHS TEST POINT 

P5 AGND TEST POINT Keystone Electronics

P6 AGND TEST POINT 5011

P9 PGND TEST POINT 

P1 PVIN POWERPOST Mill Max

P2 VIN POWERPOST 3156-1-00-00-00-00-08-0

P3 EN POWERPOST 

P4 PWMI POWERPOST 

P7 AGND POWERPOST 

P8 AGND POWERPOST 

P10 PGND POWERPOST 

SW2 SPDT SWITCH-SLIDE-SPDT EAO

SW1 SPDT SWITCH-SLIDE-SPDT 09.03201.02

Bill of Materials (Continued)

DESIGNATOR PART TYPE FOOTPRINT PART MANUFACTURER/NUMBER

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