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PDF MP1015 Data sheet ( Hoja de datos )
| Número de pieza | MP1015 | |
| Descripción | Full System Precision CCFL Driver | |
| Fabricantes | MPS | |
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Monolithic Power Systems
MP1015
Full System
Precision CCFL Driver
General Description
The MP1015 is a Power IC that offers a true
complete solution for driving a 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 (patented), it greatly increases the
power conversion efficiency. The MP1015 can be
used with analog or burst mode dimming without
any additional external components. The MP1015
offers four distinct performance advantages:
1. More light for less power
2. Smallest board implementation possible
3. Low EMI emission
4. Low cost off the shelf components
Ordering Information
Part Number∗ Package
Temperature
MP1015EM
TSSOP20
-20°C to +85°C
MP1015EF
TSSOP20F
-20°C to +85°C
EV0001
MP1015EM Evaluation Board
∗ For Tape & Reel use suffix - Z (e.g. MP1015EM-Z)
Features
Built-in Burst Mode Oscillator and Modulator
Built-in Analog and Burst Mode Dimming
Built-in Current and Voltage Feedback Control
Built-in Open/Short Lamp Protection
Built-in Dual Mode Fault Timer
Built-in Soft-on/Soft-off Burst Mode
Automatic Recovery from ESD Event
Wide Range 6 to 22V Battery Voltage with
Regulated Lamp Current
Startup at all voltages and temp without
additional components
Integrated 0.10Ω Power Switches
Output Short Circuit Protected
No High Voltage Ballast Capacitor
Evaluation Board Available
Applications
LCD Backlight inverter for notebook computers,
Web Pads, GPS, or desktop display
Figure 1: Typical Circuit for PWM or Analog Mode Operation (includes all protection requirements)
Cft Ccomp Cref CbaR
Rs
CbtR
20 19 18 17 16 15 14 13 12 11
Risb
Csfb
Rsfb
Cp
T1
Cisb
Cs2
Cs1
Rlfb
Rbosc MP 1015
Rdamp
Lamp
ABrt
DBrt
Rdbr
1 23
Cbosc
4 5 6 7 8 9 10
Cdrv
CbaL
En
Cdbr
Gnd
F1 Cba
Batt
CbtL
Rbleed
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
1
1 page  
Monolithic Power Systems
Feature Description (continued)
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, then the internal drive voltage (VDrv) will
collapse from 6.2V to 0V. The reference voltage will
stay high at 5.0V.
Lamp Startup
The strike voltage of the lamp will always be
guaranteed at any temperature because the
MP1015 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.
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.
Application Information
Pin 19 (ISFB) : Rsfb, Csfb , Risb and Cisb
(Secondary Short Protection)
The Rsfb and Csfb combination is used for
feedback to the IS pin to detect excessive
secondary current. These resistors have to be +/-
5% tolerance components. The value for Rsfb is
approximately 1.7KΩ and Csfb is approximately
82nF. This will ensure that the voltage at the ISFB
pin is typically 1.0V during steady state operation.
The maximum value for Csfb is 93nF to ensure that
the chip will meet the UL1950 specification. Risb
and Cisb components are used as a high pass
filter.
Pin 18 (VLFB): Cs1, Cs2 and Rs
(Open Lamp protection)
The regulated open lamp voltage is proportional to
the Cs1 and Cs2 ratio. Cs1 has to be rated at 3KV
and is typically between 5 to 22pF. The value of
Cs1 is typically 15pF and is chosen for a specified
maximum frequency. The value of Cs2 is set by the
MP1015
Full System
Precision CCFL Driver
Customer to achieve the required open lamp
voltage detection value, typically 4nF.
Cs2=Cs1 * V(max)rms/ 3.5Vrms)
The value of Rs is typically 300KΩ (not critical).
Pin 17 (FT): Cft
The Cft cap is used to set the fault timer. This
capacitor will determine when the chip will reach
the fault threshold value. The user can choose the
cap value to set the time out value.
Open Lamp Time
Cft (nF) = T(open lamp) (1µA)/ 1.2 V
For a Cft= 820nF, then the time out for open lamp
will be 0.98 sec.
Secondary Short Turn Off time
Because the sourcing current for a secondary short
is approx. 120µA, then the off time when a resistive
short occurs across the lamp will be approx 100
times faster than the open lamp time.
To reduce the turn off time even further, then by
modifying the connection at the FT node to:
100K
FT
Cft 10nf
Figure 3: Turn Off Time Adjustment
For a Cap=10nF, then the time out for secondary
short will be 0.11ms. The turn off time for the
secondary short will be reduced by an additional
100 times.
Note: The open lamp time will remain the same
value as defined by Cft.
Pin 16 (Comp): Ccomp
This cap is the system compensation cap that
connects between comp and AGnd. A 1.5nf or
2.2nF cap is recommended. This cap should be
X7R ceramic with a voltage rating sufficient for 5V
biasing. The value of Ccomp affects the soft-on rise
time and soft-off fall time.
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MP1015.PDF ] | |
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