12/08/10
Specifications and
Applications Information
page 1 of 5.
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Driver
Package Configuration
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, wide
dimming and LCD brightness stability over a wide input voltage
range. The SFD2CB3965F is designed to provide backlight
power for the ERG SF2R3766SHF.
Designed, manufactured and supported within the USA, the
SFD2C features:
Constant LED current
High efficiency
External or Internal dimming
High dimming ratio
Seperate enable and dimming function
Open/short circuit protection
Soft start
One year warranty
Mass: 85 grams
Connectors
J1-1,2,3 Vin(+)
J1-4,5,6 Vin(+)
J1-7,8,9 GND
J1-10,11,12 GND
J1-13 Enable
J1-14 PWM
J1-15 Control
J2-1 Cathode 1 J3-1 Cathode 3
J2-2 Anode 1 J3-2 Anode 3
J2-3 Cathode 2 J3-3 Cathode 4
J2-4 Anode 2 J3-4 Anode 4
Output Connector
Molex
53261-0471
Input Connector
Molex
53261-1571
PCB components are shown for reference only. Actual product may differ from that shown.
5.210
[132,3]
2.20
[55,9]
.125
[3,18]
Dia. (5x)
5.610
[142,5]
2.605
[66,17]
.20
[5,1]
.20
[5,1]
1.800
[45,72]
.900
[22,86]
J1
J3
J2
1
1
1
SFD2CB3965F
page 2 of 5.
Note 1 Surface temperature must not exceed 80°C; thermal management actions may be required.
Note 2 Input Current and Efficiency are calculated with 44V LED strings.
Note 3 Hysteretic current control frequency.
Note 4 The input voltage to the driver must be within its operating characteristic before the driver is enabled,
otherwise the driver may not start or may shut down unexpectedly.
Note 5 Enable pin is internally pulled up above the Turn-on Threshold.
Note 6 PWM pin is internally pulled up above turn on threshold.
Note 7 Input Impedance is 2.5kohms to 2.5V.
Note 8 Control pin is internally held to 2.5V.
Specifications subject to change without notice.
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SFD2CB3965F
page 3 of 5.
Application Information
The ERG SFD2CB3965F has been designed to be configured in multiple ways:
NO DIMMING
•OPERATION: The SFD driver can be configured to operate without dimming by grounding the Control Pin (J1-15),
floating the Enable Pin (J1-13), and floating the PWM Pin (J1-14).
•Pins 1 through 6 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 7 through 12 of
connector J1 must be connected to GND.
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 100:1 is possible with this configuration.
•DIMMING: Dimming is accomplished by applying an analog voltage to the Control Pin (J1-15). 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(J1-13). 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 through 6 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 7 through 12 of
connector J1 must be connected to GND. Pin 14 may be left floating or pulled up.
EXTERNAL PWM DIMMING
•OPERATION: External PWM configuration as shown in Figure 2 allows the user to control display brightness
with an externally generated PWM signal. The user is responsible to provide the PWM signal. A dimming ratio up
to 10,000:1 is possible with this configuration.
•DIMMING: Dimming is accomplished by applying a PWM signal to the PWM Pin (J1-14). PWM on and off levels
are specified in the Operating Characteristics section of the data sheet. Display brightness is modulated by
controlling the PWM duty cycle as shown in Graph 2.
•ENABLE/DISABLE: The driver may be enabled or disabled (turned on and off) by applying a DC voltage to the
Enable Pin (J1-13). Enable Pin on and off levels are specified in the Operating Characteristics section of the
data sheet.
•Pins 1 through 6 of connector J1 must be connected to +Vin, between 10.8 and 18 Vdc. Pins 7 through 12 of
connector J1 must be connected to GND. Pin 15 must be held below the Full-on Threshold or connected directly
to ground.
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page 4 of 5.
Graph 1
ONBOARD PWM DIMMING
+On
-Off
Analog Dimming
Voltage (0 to 5V)
Control
Enable
Cathode 2
+12V
PWM
Vin
J1 13
14
7-12
1-6
Cathode 1
Anode 1
Figure 1
Anode 2
J2
Cathode 4
Cathode 3
Anode 3
Anode 4
J3
Float
GND
15
SFD2CB3965F
page 5 of 5.
Graph 2
Figure 2
EXTERNAL PWM DIMMING
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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.
Enable
PWM
GND
Vin
J1
5V
Duty Cycle
0% - 100%
0V 14
13
7-12
1-6
J3
Cathode 2
Cathode 1
Anode 1
Anode 2
Cathode 4
Cathode 3
Anode 3
Anode 4
J2
15
+12V
Control
+On
-Off
SFD2CB3965F
