8mF42859 Datasheet PDF - Endicott Research Group

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8mF42859
Endicott Research Group

Part Number 8mF42859
Description Four Lamp DC to AC Inverter
Page 4 Pages


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8mF42859
Specifications and Applications
Information
08/07/06
Preliminary
The ERG 8mF42859 (8mF4 Series) DC to AC inverter
features onboard connectors and can be dimmed using an
external pulse-width modulated control signal or using the
onboard PWM with an external analog voltage. This unit is
9mm in height and the four mounting holes makes installa-
tion straight forward.
Powered by a regulated +12 Volt DC source, the 8mF42859
is designed to power the Optrex T-51511D150-FW-A-AC 4
lamp backlight.
Product Features
9 Small Package Size, less than 9 mm in
height.
9 High Dimming Ratio
9 High Efficiency
9 Made in U.S.A.
Four Lamp
DC to AC Inverter
Package Configuration
.110
[2,79]
Dia. (4x)
2.12
[53,85]
MAX
11
J4 J5
5.670
[144,0]
6.33
[161,29]
MAX
Input
J2 J3
.33 1 1
[8,4]
1.732
.18 [4,6]
[44.0]
8mF4 Series
PCB components are shown for reference only.
Actual product may differ from that shown.
Connectors
Input
Output (2X)
Molex 53261-0871 JST SM02(4.0)B-BHS-1-TB
Output (2X)
JST SM02B-BHSS-1-TB
Mass: 93 grams
Pin Descriptions
J1-1 Vin
J1-2 Vin
J1-3 GND
J1-4 GND
J2-1 ACcom1 J3-1 ACout1
J2-2 ACcom2 J3-2 ACout2
J1-5 Enable/PWM
J1-6 Control
J1-7 N/C
J1-8 N/C
J5-1 ACcom3 J4-1 ACout3
J5-2 ACcom4 J4-2 ACout4
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8mF42859
Absolute Maximum Ratings
Rating
Symbol
Value
Units
Input Voltage Range
Vin -0.3 to +13.2
Storage Temperature
Tstg -40 to +85
Operating Characteristics
With a load simulating the referenced display and lamp warm-up of 20 minutes.
Unless otherwise noted Vin = 12.00 Volts dc and Ta = 25oC.
Characteristic
Symbol
Min
Vdc
oC
Typ
Max
Input Voltage
Component Surface
Temperature
Input Current (Note 1)
Input Ripple Current
Operating Frequency
Minimum Output Voltage
Efficiency
V in
Ts
I in
l rip
Fo
Vout (min)
h
+10.8
-20
-
-
41
1400
-
+12.0
-
1.52
40
46
-
84
+12.6
+80
1.75
-
51
-
-
Output Current (per lamp)
Output Voltage
Enable Pin
I out - 6.7 -
Vout - 570 -
Turn-off Threshold
V thoff
Turn-On Threshold
V thon
Impedance to Vin
R Enable
Specifications subject to change without notice.
0
2.5
9.5
-1
- Vin
10.0 10.5
(Note 1) Input current in excess of maximum may indicate a load/inverter mismatch condition, which
can result in reduced reliability. Please contact ERG technical support.
Units
Vdc
oC
Adc
mA pk-pk
kHz
Vrms
%
mArms
Vrms
Vdc
Vdc
kOhms
Application Notes:
1) The minimum distance from high voltage areas of the inverter to any conductive material should be .12
inches per kilovolt of starting voltage.
2) Mounting hardware should be non-conductive.
3) Open framed inverters should not be used in applications at altitudes over 10,000 feet.
4) Contact ERG for possible exceptions.
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8mF42859
Onboard PWM
Unless otherwise noted Vin = 12.00 Volts DC , Ta = 25 oC and unit has been running for 20 minutes.
Characteristic
Symbol
Min
Typ
Max
Units
Frequency
fpwm
- 160 -
HZ
Control Full On
Vctrll - <.5 -
V
Control Full Off
Vctrlh - >4.5 -
V
Control Input Bias Current
I cbias
-
- 10 uA
Pin Descriptions
Vin Input voltage to the inverter. Both pins should be connected for optimum reliability and efficiency .
GND
Control
Enable/
Disable
Inverter ground. Both pins should be connected for optimum reliability and efficiency.
Analog voltage input to the onboard pulse width modulator. Increasing this voltage increases the off
time of the onboard PWM resulting in decreased brightness.
Inverter Enable/Disable. If this pin is driven high, the inverter is enabled. Pull this pin low to disable
inverter operation.
Application information
The 8mF4 series of inverters is designed to power up to four cold cathode fluorescent lamps with combined
power from ten watts to forty watts. An external enable/disable control and an onboard analog controlled pulse
width modulator provide flexibility in allowing either PWM or analog methods for dimming. The 8mF4 inverter can
reliably dim to less than 0.5% duty cycle, which results in an electrical dimming ratio of greater than 200:1.
Depending upon the attached backlight assembly, optical dimming ratios of greater than 1000:1 can be
accomplished. Graph 1 shows the relationship of relative brightness to duty cycle for a typical backlight assembly.
External shutdown or external PWM operation of the inverter is accomplished using the Enable/Disable pin.
Enabling the inverter is accomplished by pulling this pin high (above Vthon). Pulling this pin low (below Vthoff)
disables the inverter.
If analog voltage dimming is required, the onboard PWM can be enabled. The analog voltage is applied to the
Control pin. Figure 1 shows how to connect the inverter for onboard PWM operation. Graph 2 shows the
relationship of PWM duty cycle to input control voltage.
If an external PWM is used, connect the enable pin to the PWM source and connect the control pin to the inverter
ground. If the onboard PWM is used, connect the analog voltage to the control pin.
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8mF42859
1.0
0.8
0.6
0.4
0.2
0.0
0
Relative Brightness vs. Duty Cycle
20 40 60 80 100
Duty Cycle (%)
Graph 1
100%
80%
60%
40%
20%
0%
0
Control Voltage vs. Duty Cycle
1234
Control Voltage (V)
5
Graph 2
Typical Application
*
Research Gr
U® L
O
9I0S0T1E RED
FI
A33
* Valid only with onboard PWM
Figure 1
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.
page 4.



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