DS26LS32CMX NOPB - TEXAS INSTRUMENTS

Connectors

03/30/11

Specifications and

Applications Information

page 1 of 5.

The ERG Smart Force SeriesSmart Force Series

Smart Force SeriesSmart Force Series

Smart Force Series of LED Drivers are specifically

designed for applications which require high efficiency, small

footprint and LCD brightness stability over a wide input voltage

range. The SFDMDB3638F is designed to provide backlight

power for the NEC NL10276BC13-01C display.

Designed, manufactured and supported within the USA, the

SFDMD features:

Less than 5 mm in height

Wide input voltage range

Constant LED current

With internal dimming signal, up to 255:1

dimming ratio

Open and short circuit protection

High efficiency

Separate enable and dimming function

Soft start

One year warranty

J1-1 Vin(+)

J1-2 Vin(+)

J1-3 GND

J1-4 GND

J1-5 Enable

J1-6 N/C

J1-7 Control

J1-8 Fault Indicator

(output)

SmarSmar

Smart Ft F

t Ft F

t Foror

oror

orce LEDce LED

ce LEDce LED

ce LED

DriverDriver

Driver

Input Connector

Molex

53261-0871

Package Configuration

PCB components are shown for reference only. Actual product may differ from that shown.

Mass: 9 grams typ.

SFDMDB3638F

Output

.125

[3,18]

Dia. (2x)

1.206

[30,63]

.942

[23,92]

.135

[3,43]

Input

.96

[24,4]

2.782

[70,66]

.685

[17,40]

Output Connector *

Molex

53261-1271

J2-1 Cathode 1 J2-7 Cathode 4

J2-2 Anode 1 J2-8 Anode 4

J2-3 Cathode 2 J2-9 Cathode 5

J2-4 Anode 2 J2-10 Anode 5

J2-5 Cathode 3 J2-11 Cathode 6

J2-6 Anode 3 J2-12 Anode 6

* Requires harness:

ERG part number H10312152 recommended

page 2 of 5.

(Operating Characteristics and notes are continued on next page.)

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SFDMDB3638F

page 3 of 5.

Note 1 Surface temperature must not exceed 80°C, except U1, which cannot exceed 95°C.

Note 2 Exceeding maximum string voltage specification will damage the LED driver.

Note 3 The LED driver is capable of driving strings less than the minimum string voltage specification,

although doing so will limit the maximum input voltage.

To determine max Vin:

minimum LED string voltage

≥≥

≥

(1.3) x (Vin maximum)

Note 4 Efficiency is calculated using a 30V LED string.

Note 5 The Enable pin is internally pulled up above the turn-on threshold.

Note 6 Enable pin input impedance is 9kΩ to 8V with a 12V input voltage.

Note 7 Control pin is internally pulled up above the turn-on threshold.

Note 8 Control pin input impedance is 485kΩ.

Note 9 Loading with an impedance less than 100kΩ to Vcc or to ground may cause the default levels to change.

Specifications subject to change without notice.

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SFDMDB3638F

page 4 of 5.

Application Information

The ERG SFDMDB3638F has been designed to be configured in multiple ways:

NO DIMMING

•OPERATION: The SFD can be configured to operate without dimming by floating the Enable (J1-5) and

Control (J1-7) pins.

•Pins 1 and 2 of connector J1 must be connected to +Vin, between 8 and 18 Vdc. Pins 3 and 4 of connector

J1 must be connected to GND.

•DISABLING DRIVER: Pulling the Enable pin (J1-5) below the minimum turn-off threshold of 0.8V will disable the

driver. Disabling the driver will require the ability to sink ≥2mA below the turn-off threshold. This pin may be driven

by an open collector stage or a totem pole stage.

ONBOARD PWM DIMMING

•OPERATION: Onboard PWM configuration as shown in Figure 1 allows the user to control display brightness by

controlling the onboard PWM generator. The user is responsible to provide an analog control signal. A dimming

ratio up to 255:1 is possible with this configuration.

•DIMMING: Dimming is accomplished by applying an analog voltage to the Control Pin (J1-7). Display brightness

is modulated by controlling the Control Pin voltage as shown in Graph 1.

•ENABLE/DISABLE: The driver may be enabled or disabled (turned on and off) by applying a DC voltage to the

Enable Pin(J1-5). Enable Pin on and off levels are specified in the Operating Characteristics section of the data

sheet. The driver can also be enabled by floating the Enable Pin.

• Pins 1 and 2 of connector J1 must be connected to +Vin, between 8 and 18 Vdc. Pins 3 and 4 of connector

J1 must be connected to GND.

FAULT INDICATOR

•The Fault Indicator pin (J1-8) may be used as a feedback signal that will fall below the fault level of 0.3V in the

case of an open string, a shorted string, an output overvoltage condition, or an over temperature condition. If

used, this pin should be loaded with a high impedance stage as specified in the Operating Characteristics. Do

not drive this pin with a voltage, as it will damage the driver.

SFDMDB3638F

page 5 of 5.

Endicott Research Group, Inc. (ERG) reserves the right to make changes in circuit design and/or

specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets

are current before placing orders. Information furnished by ERG is believed to be accurate and

reliable. However, no responsibility is assumed by ERG for its use.

(1) Low ESR type input by-pass capacitor (10 uF - 220 uF) may be required to reduce reflected ripple

and to improve power supply response.

SFDMDB3638F

Graph 1

ONBOARD PWM DIMMING

Figure 1

Vin

GND

Control

Enable

Cathode 1

+12V

GND

Vin

Anode 1

Analog Dimming

Voltage (0 to 5V)

1,2

3,4

1,2

Cathode 2

Anode 2

Cathode 3

Anode 3

+On

-Off

Optional

Potentiometer

Fault

(output) 8

3,4

+(1)

Cathode 4

Anode 4

Cathode 5

Anode 5

Cathode 6

Anode 6