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PDF MP1029 Data sheet ( Hoja de datos )
| Número de pieza | MP1029 | |
| Descripción | Cold Cathode Fluorescent Lamp Driver | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP1029 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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The Future of Analog IC Technology
MP1029
Cold Cathode Fluorescent
Lamp Driver
PROPRIETARY INFORMATION — RIHUI USE ONLY
DESCRIPTION
The MP1029 offers a complete power IC
solution for driving Cold Cathode Fluorescent
Lamps (CCFL). This Power IC converts
unregulated DC voltage to a nearly pure sine
wave required to ignite and operate the CCFL.
Based on proprietary power topology and
control techniques it greatly increases the
power conversion efficiency.
FEATURES
• Integrated Power Switches
• 6.0V to 17V Variable Supply Voltage with
Regulated Lamp Current
• 12W Power Output at 12V Input
• Open Lamp Regulation
• Current and Voltage Feedback Control
• Logic Level Burst Mode Control
• Supports Open/Short Lamp protection
• Soft-Start
• Output Short Circuit Protection
• Low Lamp Operating Voltage for Increasing
Transformers or Using Smaller Transformers
• Analog and Burst Dimming
APPLICATIONS
• Backlight Inverters for Portable/Automotive
DVD, GPS, Automotive Video Display
Systems
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
The MP1029 is covered by US Patents 6,114,814, 6,316,881.
TYPICAL APPLICATION
R1 R2
C5
EN EN REF
R8 C1
C4
BOS
COMP
C3
BR
AB
FT R3
C2
T/B DB AGND
C14
VBATT
FUSE C15 C13
DA*
GND
R7 C12
DR OL
MP1029
IN FB
OUTL
PGND
BSTL
IN
PGND
OUTR
C6
IL
DB*
BSTR
C7
T1
C11
R4 C8
R6
C10 C9
R5
*DA*, DB*: BAT54 or IN4148 required
for VIN less than or equal to 7V.
CN1 HV
MP1029_TAC
MP1029 Rev. 1.4
5/18/2006
www.DataSheet.in
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
1 page  
MP1029 — COLD CATHODE FLUORESCENT LAMP DRIVER
PROPRIETARY INFORMATION — RIHUI USE ONLY
OPERATION
Brightness Control
The MP1029 can operate in three modes:
Analog Mode, Burst Mode with a DC Input and
Burst Mode with an External PWM.
The three modes are dependent on the pin
connections as per Table 1. The MP1029 has a
soft on and soft off feature to reduce noise
when using burst mode dimming.
Table 1—Function Mode
Function
Pin Connection
Pin 1 Pin 4 Pin 3
Analog Mode
Burst Mode with
DC input voltage
Burst Mode from
external source
AB
0 – 1.9V
DB
VREF
VREF 0 to 1.8V
BOS
AGND
R1
C1
VREF
PWM
1.5V
Brightness Polarity:
Burst: 100% duty cycle is at 1.8V
Analog: 1.9V is maximum brightness
Choosing the required burst repetition
frequency can be achieved by an RC
combination, as defined in component
selection.
Chip Enable
The chip has an On/Off function, which is
controlled by the EN pin (#5). The enable signal
goes directly to a Schmitt trigger. The chip will
turn ON with an EN = High and OFF with an EN
= Low.
Fault Protection
Open Lamp: The OL pin (Pin 18) is used to
detect whether an open lamp condition has
occurred. During normal operation the OL pin is
typically at 5V DC with an AC swing of ±2V. If
an open lamp condition exists then the AC
voltage on the OL line will swing below zero
volts. When this occurs, the IC will regulate the
OL voltage to 10V p-p and a 1µA current source
will inject into the FT pin. If the voltage at the FT
pin exceeds 1.2V, the chip will shut down.
Excessive Secondary Current (Shorted Lamp
and UL safety specs): The FB pin (Pin 19) is
used to detect whether excessive secondary
current has occurred. During normal operation
the FB voltage is a 1V p-p AC signal centered
at zero volts D.C. If a fault condition occurs that
increases the secondary current, then the
voltage at FB will be greater than 1.2V. When
this occurs, the IC will regulate the FB voltage
to 2.4V p-p and a 120µA current source will
inject into the FT pin. If the voltage at the FT pin
exceeds 1.2V, the chip will shut down.
Lamp Startup
The strike voltage of the lamp will always be
guaranteed at any temperature because the
MP1029 uses a resonant topology for switching
the outputs. The device will continue to switch
at the resonant frequency of the tank until the
strike voltage is achieved. This eliminates the
need for external ramp timing circuits to ensure
startup.
Fault Timer
The timing for the fault timer will depend on the
sourcing current as described above and the
capacitor on the FT pin. The user can program
the time for the voltage to rise before the chip
detects a “real“ fault. When a fault is triggered,
the internal drive voltage (VDR) will collapse
from 6.2V to 0V and the reference voltage will
stay high at 5V.
Low VIN Applications
If the minimum VIN is less than 7V, it is required
that the external boost diodes DA and DB be
used. The boost diodes can be implemented
using low cost components such as IN4148 or
BAT54.
MP1029 Rev. 1.4
5/18/2006
www.DataSheet.in
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet MP1029.PDF ] | |
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