MP1011A
Cold Cathode Fluorescent Lamp Driver
General Description Features
The MP1011A is a Power IC offering a • Integrated power switches
complete solution for driving one or more • 6.0 to 22v variable supply voltage with
Cold Cathode Fluorescent Lamps (CCFL). regulated lamp current.
This Power IC converts unregulated DC voltage • Rated 12W power output at 12V input
to a nearly pure sine wave required to ignite and • Open lamp regulation
operate the CCFL. Based on proprietary power • Current and Voltage feedback control
topology and patented control techniques, it • Logic Level burst mode control
greatly increases the power conversion • Thermal Shutdown
efficiency. The MP1011A supports both analog
• Supports Open/Short Lamp protection
and burst mode dimming without any additional
• Soft Start
external components. The MP1011A offers four
distinct performance advantages: • Output is short circuit protected
1. More light for less power • Low lamp operating voltage for increasing
2. Small board implementation transformer or using smaller transformer
3. Low EMI emission • Allows Burst-Mode Operation
4. Low cost off the shelf components • No ballast capacitor required
Ordering Information Applications
Part Number ∗ Package Temperature LCD backlight inverter for large portable
MP1011EMA TSSOP 20 pin -20°° C to + 85°°C or desktop display.
∗ For Tape & Reel use suffix - Z (e.g. MP1011EMA-Z)
Typical Application Circuit:
1
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
MP1011A
Cold Cathode Fluorescent Lamp Driver
Absolute Maximum Ratings: Recommended Operating Conditions:
Vcc 25 V Input Voltage Vcc 6.0V to 22V
Power Dissipation 1.0 W Brightness Voltage 0 to 2.0V
Logic Inputs -0.7 V to 6.8V Enable 0 to 5.0 V
Thermal resistance 140° C/W Operating Frequency 20KHz to 90KHz
Junction Temperature 150° C Operating Temperature -20° C to + 85° C
Lead Temperature (Solder) 260° C
Operating Frequency 150KHz
Storage Temperature –55° C to 150° C
Electrical Characteristics (Unless otherwise specified Vcc=12v, Ta=25° C)
Parameters Symbol Condition Min Typ Max Units
Reference Voltage
Output Voltage Vref Iref=3mA 4.85 5.1 5.35 V
Reference Current Iref 3.0 mA
Line Regulation 6.5V < VCC < 22 V 30 mV
Load Regulation 0 < Ire < 3.0 mA 30 mV
Voltage Supply
Supply Current (quiescent) Icc (off) 10 µA
Supply Current (operating) Icc (on) 6.0V < Vcc < 22V 1.8 2.5 mA
Operating Range Vcc (Note 2) 6.0 22 V
Shutdown Logic
Thermal Shutdown 145 °C
Open Lamp Detect Vol 1.0 1.2 1.4 V
Enable Voltage Low Vil 0.6 V
Enable Voltage High Vih 2.0 V
Burst Voltage Low Vil 0.8 V
Burst Voltage High Vih 2.4 V
Output Drivers
On Resistance Ron (Note 1) 0.10 0.12 0.15 Ω
Short Circuit Current Isc 4 A
Operating Frequency 20 60 90 KHz
Zero-Crossing Voltage Vzc 0 6 10 mV
Ton(min) Vcomp=0V, Vcc = 22V 500 625 750 nS
Ton(min) Vcomp=0V, Vcc = 6V 900 1200 1500 nS
Brightness Control
Sense Full Brightness Vsense Vbright= 2.0V 357 375 393 mV
Sense Full Dim Vsense Vbright= 0V 83 92 101 mV
Lamp Current Regulation 6.0v < Vcc < 22v 2 5 %
Note 1: This parameter is guaranteed by design.
Note 2: See Leakage Inductance Guide lines for Minimum Operating Voltage (Table 2).
2
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
MP1011A
Cold Cathode Fluorescent Lamp Driver
Pin Description
Pin # Pin Name Pin Function
1 Bright Dimming Control: 0 volts is full Dim and 2V is full brightness
2 I sense Lamp current feedback sense input.
3 Burst To use for burst mode, the pin is switched between 0V and 5V
When not using burst mode, then pin must be tied to ground.
4 Enable The enable will turn the chip on/off. Do not float this pin.
5 Vdr Internally generated MOSFET gate drive supply voltage
6 Vcc Power Supply input
7 OutL Output to Load ( tank circuit )
8 NC No Connect
9 PGND Power Ground
10 BstL Regulated output voltage for boost cap on phase L
11 BstR Regulated output voltage for boost cap on phase R
12 PGND Power Ground
13 NC No Connect
14 OutR Output to Load ( tank circuit )
15 Vcc Power Supply input
16 Vdr Internally connected to Vdr (pin 5). This pin must be left open.
17 Vref Reference voltage output
18 Comp Loop compensation cap
19 Open lamp Latching shutdown for open lamp or low battery
20 AGND Small signal ground
Functional Block Diagram:
Rsense
CbstL CbstR
Vcc Vcc
Bright Comp Isense Vref VdrL BstL VccL OutL OutR VccR BstR VdrR
Vr 6.2 Volt
Regulator
.
Driver Driver
Mp1 Mp2 Mp3 Vr 5.1 Volt
A1 Mn1 Mn2 A2 Regulator .
+ +
- - Thermal
Shutdown
Driver Driver
.
. .
Control
Current
. Logic .
. . . Sensing
Ton
C1
+
CT -
Open Lamp Enable Burst AGND PGND PGND
3
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
MP1011A
Cold Cathode Fluorescent Lamp Driver
Truth Table
Enable Burst Output L /Output R
L X High Z
H H 0 volts ( Standby)
L X High Z
H L Normal Operation
Reference Design for Burst Mode Operation with Open Lamp Regulation and Shutdown
See Note
Q1
Below
Optional. Used to meet UL D1a
requirements.
Rsd
Rolpu D1
Q2 C_sd C_olpu D1b
Cul
Rul1
Rul2 C_comp
C_vref C_opv C_para
JP1 C_vccR
F1
Vcc C_vcc
4 Burst
3 Enable FUSE
2 Gnd
1 C_bstR
A
4 HEADER Rser
20
19
18
17
16
15
14
13
12
11
J1
C_ser 1 T1 5 Lamp(+)
VCC
NC
Vdr
AGnd
OutR
BstR
comp
Vref
1
PGnd_R
open lamp
4 8 CON2
MP1011
PGnd_L
Enable
ISense
Bright
Rbleed
Burst
VCC
OutL
BstL
NC
Vdr
10
1
C_bstL D2b
C_vccL D2a
Ren1 Ren2 C_vdrL
C_sense Rsense
C_en
A
A
Note:This circuitry is for 'lamp-out'
detection. If this feature is not needed,
remove the outlined components, short the
upper side of C para to Gnd and short
pins 17 and 19 of the MP1011.
For additional reference designs, please see MP1011UG demo board user’s guide
4
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
MP1011A
Cold Cathode Fluorescent Lamp Driver
Table 1 Bill of Materials
Item Qty Description Vendor / Part # Designation
Resistors
1 1 4.3KΩ, ±5%, SMD, 0805 Rbleed
2 1 100KΩ, ±5%, SMD, 0805 Ren1
3 1 100KΩ, ±5%, SMD, 0805 Ren2
4 2 1MΩ, ±5%, SMD, 0805 Rsd, Rolpu
5 1 140Ω, ±1%, SMD, 0805 Rsense
6 1 1KΩ, ±5%, SMD, 0805 Rser
7 1 2MΩ, ±5%, SMD, 0805 (For UL) Rul1
8 1 280KΩ, ±5%, SMD, 0805 (For UL) Rul2
Capacitors
9 2 10nF, 50V, Y5V, SMD C_bstL, C_bstR
10 2 10nF, 16V, X7R, SMD C_olpu, C_comp
11 1 100pF 50V NPO C_en
12 1 1uF 6.3V X7R C_sd
13 1 6.8nF 16V X7R C_opv
14 1 10pF, 3KV C_para
15 1 0.22uF, 16V, Y5V, (optional) C_sense
16 1 2X.47uF 16V X7R C_ser
17 2 1uF 25V Y5V C_vccR, C_vccL
18 1 10uF, 25V, Y5U, SMD, 1210 C_vcc
19 1 220nF, 10V Y5V, SMD C_vdrL
20 1 0.1uF, 10V, X7R, SMD C_vref
21 1 100nF, 10V, Y5Y, SMD (for UL) Cul
Semiconductors
22 4 Diode, BAV99L D1b, D1a, D2b, D2a
23 2 Transistor, bipolar, 2N3904, SMD Q1, Q2
Integrated Circuits
24 1 MP1011A, 20-pin TSSOP Monolithic Power Systems U2
Magnetics
25 1 Transformer* T1
Hardware
26 1 Fuse, 1A F1
*Transformer Sources:
Company Part # Location Contact Info
Toko BLC103B Saitama-Ken, Japan http://www.toko.co.jp
+81-492-791611
Darfon Electronics Corp. Contact Vendor Taoyuan 333, Taiwan +886-3-329-4141
FDK CD-T-0836-520 Yamaguchi, Japan http://www.fdk.co.jp
TMP Contact Vendor Taipei, Taiwan +886-2-8667-2081
5
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
MP1011A
Cold Cathode Fluorescent Lamp Driver
Table 2: Leakage Inductance Guide Lines for Minimum Operating Voltage
Minimum Operating Supply Recommended Maximum Primary
Voltage Leakage Inductance*
6 38µH
7 42µH
8 45µH
9 47µH
10 49µH
∗ If the maximum primary leakage cannot be met, consult factory for alternatives.
Packaging Information
0.019(0.500)
0.031(0.800)
PIN 1 IDENT
0.169 0.246
0.177 0.258
(4.300) (6.250)
(4.500) (6.550)
OPTION BTM. E-PIN WITH THAILAND.
0.252(6.400)
0.259(6.600)
GAGE PLANE
0.039(1.000)
0.047(1.200)
0.031(0.800) o
o
0.002 (0.050) 2
0.041(1.050) 0.004(0.090) 0 - 8
0.006 (0.150) 0.010
0.007(0.190) 0.008(0.200) 0.018 (0.450)
(0.254)
0.012(0.300) 0.029 (0.750)
6
MPS, Inc 3777 Stevens Creek Blvd. Revision 1.7
Suite 400 Santa Clara, 95051-7364 USA April, 2001
Tel (408) 243-0088, Fax (408) 243-0099
www.monolithicpower.com
