mp1010bef MPS, mp1010bef Datasheet - Page 9

• Manufacturer Part Number: mp1010bef
• Description: Cold Cathode Fluorescent Lamp Driver
• Manufacturer: MPS

Rdamp and Rbleed are used to ensure that the
bridge outputs are 0V prior to startup. Typically
Rbleed=4.3kΩ and Rdamp=1kΩ.
Resd is highly recommended to minimize the
possibility
mishandling of the IC during board level
assembly and test. A typical value is 1kΩ.
For most transformers, one terminal connection
of the secondary winding is on the side of the
primary winding. This side must be connected
to the lamp cold side since it cannot handle
high voltages.
The transformer secondary winding leakage
inductance L
(measured with primary winding shorted). The
turns ratio is roughly:
Where V
operation conditions and V
input voltage for the inverter.
The open lamp resonant frequency is:
It is recommended that the resonant tank
(transformer and Cs1) be designed so that f
is less than 100KHz. This is to avoid possible
transformer arcing during open lamp conditions.
For better thermal performance, please use
MP1010BEF (with exposed pad). Normally,
there will be a large copper area for ground in
the bottom PCB layer which can be used for
heat dissipation. Connect the paddle to this
ground. Many vias are needed in order to
reduce the thermal impedance from the paddle
to the bottom ground.
For the ground layout, it is better that the
analog ground be connect with the power
ground at a single point, at the AGND pin or the
exposed pad. If the power ground in the bottom
layer
connection will not be as critical.
Please contact MPS for assistance with the
resonant tank design if needed.
MP1010B Rev. 2.2
9/24/2007
has
LAMP
of
f
OPEN
LK2
sufficient
n
is the lamp voltage in normal
≥
ESD
is typically 250mH to 350mH
=
V
LAMP
V
2
IN
π
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
×
_
damage
_
MIN
RMS
L
surface
IN_MIN
LK
1
2
×
×
1
1 .
Cs
is the minimum
1
in
area,
case
MP1010B – COLD CATHODE FLUORESCENT LAMP DRIVER
© 2007 MPS. All Rights Reserved.
www.MonolithicPower.com
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