MP1015 [ETC]
Full System Precision CCFL Driver; 全系统精度CCFL驱动器型号: | MP1015 |
厂家: | ETC |
描述: | Full System Precision CCFL Driver |
文件: | 总8页 (文件大小:493K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
General Description
Features
The MP1015 is a Power IC that offers a true
complete solution for driving a Cold Cathode
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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
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:
Built-in Soft-on/Soft-off Burst Mode
Automatic Recovery from ESD Event
Wide Range 6 to 22V Battery Voltage with
Regulated Lamp Current
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Startup at all voltages and temp without
additional components
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Integrated 0.10Ω Power Switches
Output Short Circuit Protected
1. More light for less power
2. Smallest board implementation possible
3. Low EMI emission
No High Voltage Ballast Capacitor
Evaluation Board Available
4. Low cost off the shelf components
Ordering Information
Applications
ꢀ
LCD Backlight inverter for notebook computers,
Web Pads, GPS, or desktop display
Package
TSSOP20
TSSOP20F
Temperature
-20°C to +85°C
-20°C to +85°C
Part Number∗
MP1015EM
MP1015EF
EV0001
MP1015EM Evaluation Board
∗ For Tape & Reel use suffix - Z (e.g. MP1015EM-Z)
Figure 1: Typical Circuit for PWM or Analog Mode Operation (includes all protection requirements)
Cisb
Risb
CbaR
Cref
Cft
Ccomp
Cs2
Cs1
Rs
Csfb
Rsfb
Rlfb
CbtR
Cp
20
19
18
17
16
15
14
13
11
12
T1
Rdamp
Rbosc
Lamp
MP 1015
2
3
4
5
9
10
1
6
7
8
CbtL
ABrt
DBrt
Cdrv
CbaL
Cbosc
Rdbr
Rbleed
En
Cdbr
Gnd
Cba
F1
Batt
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
1
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Absolute Maximum Ratings
Recommended Operating Conditions
Input Voltage (VBatt
)
25V
+/-6V
Input Voltage (VBatt
)
6 to 22V
0 to 1.9V
IL, ISFB Input Voltages (VIL, VISFB
)
Analog Brightness Voltage (VABrt)
VLFB Input Voltage (VVLFB
Logic Input Voltages
Power Dissipation
)
-0.3 to 12V
-0.3 to 6.8V
1.0W
Digital Brightness Voltage (VDBrt
)
0 to 1.8V
Enable (VEn)
0 to 5V
Operating Frequency (Typical)
60KHz
Operating Frequency
Junction Temperature
150KHz
Ambient Operating Temperature
-20°C to +85°C
150°C
Thermal Characteristics
Lead Temperature (Solder)
Storage Temperature
260°C
Thermal resistance θJA (TSSOP)
Thermal resistance θJA (TSSOPF)
140°C/W
110°C/W
–55°C to 150°C
Electrical Characteristics (Unless otherwise specified VBatt=12V, TA=25°C)
Parameters
Symbol
Condition
Min
Typ Max Units
Reference Voltage
Output Voltage
Reference Current
Line Regulation
Load Regulation
VRef
IRef
IRef = 3mA
4.75
5.0
5.25
3.0
30
V
mA
mV
mV
6.5V < VBatt< 22V
0 < IRef< 3.0mA
30
Battery Supply
Supply Current (disabled)
IBatt
IBatt
10
µA
Supply Current (enabled)
6.0V < VBatt< 22V
1.6
2.5
mA
Shutdown Logic
Fault Timer Threshold
Fault Timer Sink Current
Fault Timer Source Current
Open Lamp
V(TH)FT
1.1
2.0
1.2
1
1.3
V
VVLFB>0, VISFB<1.2V
µA
VVLFB<0, VISFB<1.2V
VISFB>1.2V
1
µA
µA
V
Secondary Overload
Enable Voltage Low
Enable Voltage High
120
V(L)En
V(H)En
0.5
V
Output Drivers
Switch On Resistance
Short Circuit Current
Ton(min)
R(ON)OutL,OutR
ISC
(Note 1)
0.085 0.12
0.15
550
Ω
A
4
VComp=0V, VBatt=22V
VComp=0V, VBatt=6V
435
ns
ns
Ton(min)
1750 2100
Brightness Control
Sense full Brightness
VIL
VIL
VABrt= 2.0V
VABrt= 0V
360
105
379
117
2
400
130
5
mV
mV
%
Sense full Dim
Lamp Current regulation
Burst Oscillator Sink Current
Burst Oscillator Peak Voltage
7V < VBatt< 22V
IBosc
VBosc
380
1.8
5
µA
V
1.7
-50
1.9
50
Digital Brightness Offset Voltage V(OS) DBrt
mV
Fault Loop Control
Open Lamp Threshold
V(TH)VLFB
V(TH)ISFB
IComp
0
V
V
µA
Secondary Current Threshold
Fault Mode Comp Current
1.2
475
VVLFB<0V, VISFB>1.2V
Note 1: This parameter is guaranteed by design.
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
2
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Pin Description
ABrt
IL
1
2
3
4
5
6
7
8
9
20 AGnd
19 ISFB
18 VLFB
17 FT
Bosc
DBrt
En
16 Comp
15 Ref
Drv
Batt
OutL
PGnd
14 Batt
13 OutR
12 PGnd
11 BtR
BtL 10
Table 1: Pin Designators
Pin Number
Pin Name
ABrt
IL
Bosc
DBrt
En
Pin Function
1
2
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)
3
4
5
6
Drv
Batt
7
8
OutL
PGnd
BtL
9
10
11
12
13
14
15
16
17
18
19
20
BtR
PGnd
OutR
Batt
Ref
Comp
FT
VLFB
ISFB
AGnd
Note 1: For the MP1015EF, connect the exposed paddle to AGND (Pin 20).
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
3
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Figure 2: Functional Block Diagram
Batt
Ref 5V
OutL
OutR
Drv 6V
Ref 5V
Internal
Comp
Regulators
IL
ABrt
S
R
Q
2.5V
+
-
Q
O
O
MUX
S
Q
75mV
+
R
Q
-
+
-
FT
Q
Q
Control
Logic
&
T
En
+
-
ISFB
TSD
1.2V
+
DBrt
-
-
VLFB
Bosc
+
Feature Description
Brightness Control
Fault Protection
The MP1015 can operate in three modes: Analog
Mode, Burst Mode with a DC input, or Burst Mode
with an external PWM. The three modes are
dependent on the pin connections as per Table 1.
Choosing the required burst repetition frequency
can be achieved by an RC combination, as defined
in component selection. The MP1015 has a soft on
and soft off feature to reduce noise, when using
burst mode dimming.
Open Lamp: The VLFB pin (#18) is used to detect
whether an open lamp condition has occurred.
During normal operation the VLFB pin is typically at
5V DC with an AC swing of +/- 2V. If an open lamp
condition exists then the AC voltage on the VLFB
line will swing below zero volts. When that occurs,
the IC regulates the VLFB 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, then the chip
will shut down.
Table 2: Function Mode
Function
Pin Connection
Excessive Secondary Current (Shorted Lamp and
UL safety specs): The ISFB pin (#19) is used to
detect whether excessive secondary current has
occurred. During normal operation the ISFB voltage
is a 1V p-p AC signal centered at zero volts D.C. If
Pin 1
Pin 4
DBrt
VRef
Pin 3
Bosc
AGnd
Rbosc
Cbosc
ABrt
Analog Mode
0 – 1.9V
Burst Mode with
DC input voltage
Burst Mode from
external source
VRef
0 – 1.8V
a
fault condition occurs that increases the
secondary current, then the voltage at ISFB will be
greater than 1.2V. When that occurs, the IC
regulates the ISFB 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, then the chip
will shut down.
VRef
PWM
1.5V
Brightness Polarity:
Burst: 100% duty cycle is at 1.8V
Analog: 1.9V is maximum brightness
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
4
MP1015
Full System
Precision CCFL Driver
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.
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.
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.
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
Chip Enable
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.
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.
To reduce the turn off time even further, then by
modifying the connection at the FT node to:
Application Information
100K
FT
Pin 19 (ISFB) : Rsfb, Csfb , Risb and Cisb
Cft
(Secondary Short Protection)
10nf
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.
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
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
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
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Application Information (Continued)
Pin 15 (Cref):
Pin 4 (DBrt) : Rdbr, Cdbr
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
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 14, Pin 7 & Pin 9 (Batt & PGnd): CbaR/L, Cba
Pin 3 (Bosc): Cbosc, Rbosc
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.
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%
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.
2) Determine Rbosc by the formula:
1.68 * [(1 / DMIN) – 1]
0.42
+ 4
Rbosc =
-6
Rdamp and Rbleed are used to ensure that the
bridge outputs are at 0V prior to startup. Typically
Rbleed = 4.3KΩ and Rdamp = 1KΩ.
3) Select a burst frequency and find TTOTAL where
TTOTAL = 1/burst frequency. Then determine Cbosc
by the formula:
Pin 11 and Pin 10 (BtL and BtR): Cbtl and Cbtr
(1-DMIN
)
Cbosc =
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
0.42 * Rbosc * fbosc
Where:
fbosc= burst frequency rate in Hz
Tmin= Minimum burst time in sec
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 Rev 2.7_03/25/03
www.monolithicpower.com
6
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Figure 4: Open_Lamp Voltage Setup and UL Test Protection Application Information
MP1015 Rev 2.7_03/25/03
www.monolithicpower.com
7
MP1015
Full System
Precision CCFL Driver
Monolithic Power Systems
Figure 5: Burst Oscillator Waveform versus Output Lamp Current
Packaging Information
TSSOP20 or TSSOP20F (Exposed Paddle **)
0.0256(0.650)TYP
0.004(0.090)
0.010(0.250)
GATE PLANE
0.150(3.80)
0.165(4.19)
PIN 1
IDENT.
0.004(0.090)
0.169
0.177
0.244
0.260
0o-8o
0.105 (2.67)
0.118 (3.00)
0.018(0.450)
0.030(0.750)
DETAIL "A"
(4.300)
(4.500)
(6.200)
(6.600)
0.030(0.750)
0.039(1.000)REF
SEE DETAIL "B"
0.030(0.750)
** EXPOSED PADDLE VERSION ONLY
SEE DETAIL "A"
0.252 (6.400)
0.260 (6.600)
0.075(0.190)
0.012(0.300)
0.032(0.800)
0.041(1.050)
0.033(0.850)
0.047(1.200)
SEATING PLANE
0.004(0.090)
0.008(0.200)
0.004(0.090)
0.006(0.160)
0.007(0.190)
0.012(0.300)
0.002(0.050)
0.006(0.150)
0.007(0.190)
0.010(0.250)
NOTE:
1) Control dimension is in inches. Dimension in bracket is millimeters.
DETAIL "B"
NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change
without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit
to any application, nor for infringement of patent or other rights of third parties.
MP1015 Rev 2.7
03/25/03
© 2003 MPS, Inc.
Monolithic Power Systems, Inc.
8
983 University Ave, Building D, Los Gatos, CA 95032 USA
Tel: 408-395-2802 ♦ Fax: 408-395-2812 ♦ Web: www.monolithicpower.com
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