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
SmarSmar
Smart Ft F
t Ft F
t Foror
oror
orce LEDce LED
ce LEDce LED
ce LED
DriverDriver
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
1
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]
1
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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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.
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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
J2
+12V
GND
Vin
Anode 1
Analog Dimming
Voltage (0 to 5V)
J1
1,2
3,4
1,2
7
5
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
