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MP1015のメーカーはMPSです、この部品の機能は「Full System Precision CCFL Driver」です。 |
部品番号 | MP1015 |
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部品説明 | Full System Precision CCFL Driver | ||
メーカ | MPS | ||
ロゴ | |||
このページの下部にプレビューとMP1015ダウンロード(pdfファイル)リンクがあります。 Total 8 pages
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
Pin Description
ABrt 1
IL 2
Bosc 3
DBrt 4
En 5
Drv 6
Batt 7
OutL 8
PGnd 9
BtL 10
MP1015
Full System
Precision CCFL Driver
20 AGnd
19 ISFB
18 VLFB
17 FT
16 Comp
15 Ref
14 Batt
13 OutR
12 PGnd
11 BtR
Table 1: Pin Designators
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Pin Name
ABrt
IL
Bosc
DBrt
En
Drv
Batt
OutL
PGnd
BtL
BtR
PGnd
OutR
Batt
Ref
Comp
FT
VLFB
ISFB
AGnd
Pin Function
Analog Dimming
Lamp Current Feedback Sense Input
Burst Oscillator Timing
Burst Mode Dimming
Chip Enable. Do not float this pin.
Internally Generated MOSFET Gate Drive Supply Voltage (6V)
Power Supply Input
Output to Load (tank circuit)
Power Ground
Regulated Output Voltage for Bootstrap Capacitor on Phase L
Regulated Output Voltage for Bootstrap Capacitor on Phase R
Power Ground
Output to Load (tank circuit)
Power Supply Input
Internally Generated Reference Voltage Output (5V)
Loop Compensation Capacitor
Fault Timer
Open Lamp Detect (Lamp Voltage Feedback.)
Shorted Lamp Detect (Secondary Current Feedback)
Small Signal Ground (Note 1)
Note 1: For the MP1015EF, connect the exposed paddle to AGND (Pin 20).
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
3
3Pages Monolithic Power Systems
Application Information (Continued)
Pin 15 (Cref):
Cref is the bypass cap for the internal 5.0V supply.
This capacitor must be placed as close as possible
to the pin. A maximum of 100 mils is recommended
between the cap and the IC. The value of the cap
is typically 0.47µF
Pin 14, Pin 7 & Pin 9 (Batt & PGnd): CbaR/L, Cba
These caps are used as the bypass caps for the
battery voltage supply line. These capacitors will
absorb most of the input switching current of the
inverter and will require adequate ripple rating. The
typical current rating for Cba is > 500mArms.
Typically CbaR and CbaL are 1µF and Cba is equal
to 2 caps of 2.2µF.
Pin 13 & Pin 8 (OutL & OutR): Cp1, Rdamp,
Rbleed
The primary transformer current flows through this
capacitor. Its value is typically 1µF and its voltage
rating is sufficient for a 5V bias. The capacitor
should be ceramic and have a ripple current rating
greater than the primary current (typically 0.8Arms).
It is more optimal to use two parallel 0.47µF
ceramic caps for minimal ESR losses.
Rdamp and Rbleed are used to ensure that the
bridge outputs are at 0V prior to startup. Typically
Rbleed = 4.3KΩ and Rdamp = 1KΩ.
Pin 11 and Pin 10 (BtL and BtR): Cbtl and Cbtr
These are the reservoir caps for the upper
switches’ gate drive. They should be 10nF and
made of X7R ceramic material and have a voltage
rating for 6.6V
biasing.
Pin 6 (Drv): Cdrv
This bypasses the 6.2V gate supply for the lower
switches. The value should be 100nF ceramic Y5V
or X7R material.
Pin 5: (En)
This pin will enable and disable the chip. Do not
float this pin.
MP1015
Full System
Precision CCFL Driver
Pin 4 (DBrt) : Rdbr, Cdbr
This pin is used for burst brightness control. The
DC voltage on this pin will control the burst
percentage on the output. The signal is filtered for
optimal operation. The active range is
approximately 0.1V to 1.8V. The value of Rdbr and
Cdbr is not critical.
Pin 3 (Bosc): Cbosc, Rbosc
The Cbosc and Rbosc will set the burst repetition
rate and the minimum Ton. Set Tmin to achieve the
minimum required system brightness. Ensure that
Tmin is long enough that the lamp does not
extinguish. These values are determined by the
following steps:
1) Select a Minimum Duty Cycle (DMIN). This is the
ratio TFALL / (TFALL + TRISE) for the burst oscillator.
For example: 10%
2) Determine Rbosc by the formula:
Rbosc = 1.68 *
[(1 / DMIN) – 1]
0.42
+4
350 * 10-6
3) Select a burst frequency and find TTOTAL where
TTOTAL = 1/burst frequency. Then determine Cbosc
by the formula:
Cbosc =
(1-DMIN)
0.42 * Rbosc * fbosc
Where:
fbosc= burst frequency rate in Hz
Tmin= Minimum burst time in sec
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
6
6 Page | |||
ページ | 合計 : 8 ページ | ||
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