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MP1026EF-LF

MP1026EF-LF

  • 厂商:

    MPS(美国芯源)

  • 封装:

    TSSOP20_EP

  • 描述:

    IC CCFL DRIVER 60KHZ 20TSSOPF

  • 数据手册
  • 价格&库存
MP1026EF-LF 数据手册
MP1026 CCFL Driver For Handheld Display Applications The Future of Analog IC Technology DESCRIPTION FEATURES The MP1026 is a Power IC that offers a complete solution for driving a Cold Cathode Fluorescent Lamp (CCFL). This Power IC converts unregulated DC voltage to a nearly pure sine wave required to ignite and operate the CCFL. • • • • • • • • • • • The MP1026 greatly increases power conversion efficiency and supports both analog and burst mode dimming, simplifying the module implementation. The MP1026 offers the following distinct performance advantages: • • • • More light for less power Small board implementation Low RF emission Low external components cost 4.5V to 14V Power Input (VBatt) Increase Transformer Reliability Open Lamp Timer and Regulation Current and Voltage Feedback Control Logic Level Burst Mode Control Supports Open/Short Lamp Protection Soft-Start Outputs are Short Circuit Protected Allows Burst-Mode Operation Improved Line Transient Response Tightened Lamp Current Accuracy APPLICATIONS • • • • The MP1026 is suitable for 2-Cell Li-Ion battery applications using 5V, 9V, or 12V adapters as the power source. Portable DVD Players PDAs Camcorders Digital Cameras “MPS” and “Monolithic Power Systems” are Registered Trademarks of Monolithic Power Systems, Inc. The MP1026 is covered by US Patents 6,316,881 and 6,114,814. TYPICAL APPLICATION Cisb CbaR Cft Ccomp Rs DA VDD Risb CbtR 11 Cp RIL BtL Rdamp 10 PGnd 9 OutL 8 Batt 7 Vdd 6 En 5 Bosc DBrt 4 3 IL 2 1 Abrt MP1026 ABrt Rlfb Rsfb BtR 12 PGnd 13 Batt OutR 14 15 Comp Vdd 16 17 FT 18 ISFB VLFB 19 20 AGnd Rbosc Cs1 CbtL DB T1 DBrt Gnd CbaL Cvdd Cdbr Rdbr Cbosc En Cs2 Csfb Rbleed DA, DB: required for VBATT < 7V IN4148 or BAT54 Cba VBATT MP1026 Rev. 1.6 9/24/2007 F1 MP1026_TAC_S01 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 1 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS ABSOLUTE MAXIMUM RATINGS (1) PACKAGE REFERENCE TOP VIEW Abrt 1 20 AGnd IL 2 19 ISFB Bosc 3 18 VLFB DBrt 4 17 FT En 5 16 Comp Vdd 6 15 Vdd Batt 7 14 Batt OutL 8 13 OutR PGnd 9 12 PGnd BtL 10 11 BtR EXPOSED PAD CONNECT TO AGND (PIN 20) Recommended Operating Conditions MP1026_PD01-TSSOP20F Package Temperature MP1026EF TSSOP20F –20°C to +85°C For Tape & Reel, add suffix –Z (eg. MP1026EF–Z) For Lead Free, add suffix –LF (eg. MP1026EF–LF–Z) (2) Battery Voltage VBATT ....................... 4.5V to 14V Input Voltage VDD ............................ 4.5V to 5.5V Enable Voltage VEN ............................ 0V to 5.0V Brightness Voltage ............................ 0V to 2.0V Operating Frequency............................... 60KHz Operating Temperature ............. –20°C to +85°C Thermal Resistance Part Number* * Input Voltage (VBATT).................................... 16V Power Dissipation...................................... 1.0W Logic Inputs .................................... 0.3V to 6.0V IL, ISFB Inputs.................................... +6V / –2V Junction Temperature...............................150°C Lead Temperature (Solder) ......................260°C Operating Frequency............................. 150KHz Storage Temperature .............. –55°C to +150°C (3) θJA θJC TSSOP20F ............................. 40 ....... 6.... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its operating conditions. 3) Measured on approximately 1” square of 1 oz copper. ELECTRICAL CHARACTERISTICS Batt = 14V, VDD = 5V, TA = +25°C, unless otherwise noted. Parameter Voltage Supply Vdd Off Current Batt Off Current Vdd Current (operating) Shutdown Logic Fault Timer Threshold Fault Timer Sink Current Fault Timer Source Current Open Lamp Secondary Overload Enable Voltage Low Enable Voltage High MP1026 Rev. 1.6 9/24/2007 Symbol Condition Min Idd(off) Enable = 0V IBatt(off) enable = 0V Idd(on) Vth(FT) VL(En) VH(En) Typ Max Units 1.2 400 20 1.8 µA µA mA V(VLFB) > 0, V(ISFB) < 1.2 1.2 1 V µA V(VLFB) > 0, V(ISFB) < 1.2 V(ISFB) > 1.2 1 115 µA µA V V 0.6 1.5 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 2 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS ELECTRICAL CHARACTERISTICS (continued) Batt = 14V, VDD = 5V, TA = +25°C, unless otherwise noted. Parameter Output Drivers Symbol Switch On Resistance (4) Condition R(ON)OUTL,O UTR Ton(min) Vdd = 5V Batt = 4.5V, Vcomp = 0V Ton(min) Vdd = 5V Batt = 14V, Vcomp = 0V First Pulse Ton(min) Batt = 4.5V Vdd = 5V First Pulse Ton(min) Batt = 14V Vdd = 5V Brightness Control Sense Full Brightness V(IL) V(Abrt) = 2.0V Sense Full Dim V(IL) V(Abrt) = 0V Lamp Current Regulation 4.5v < V(Batt) < 14V Burst Oscillator Sink Current I(Bos) Burst Oscillator Peak V(Bos) Voltage Fault Loop Control Open Lamp Threshold Vth(VLFB) Secondary Current Vth(ISFB) Threshold Fault Mode Comp Current I(Cmp) V(VLFB) < 0V, V(ISFB) > 1.2V Min Typ Max Units 0.085 0.12 0.15 Ω 360 100 1800 350 ns ns 8300 ns 1300 ns 385 115 3 370 410 130 mV mV % µA 1.8 V 0 V 1.2 V 460 µA Note: 4) This parameter is guaranteed by design. PIN FUNCTIONS Pin # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name ABrt IL Bosc DBrt En Vdd Batt OutL PGnd BtL BtR PGnd OutR Batt Vdd Comp FT VLFB ISFB AGnd MP1026 Rev. 1.6 9/24/2007 Description Analog Dimming. Lamp Current Feedback Sense Input. Burst Oscillator Timing. Burst Mode Dimming. Chip Enable. Do not float this pin. Supply Voltage. Power Supply Input. Output to Load (Tank Circuit). Power Ground. Regulated Output Voltage for Bootstrap Cap on Phase L. Regulated Output Voltage for Bootstrap Cap on Phase R. Power Ground. Output to Load (Tank Circuit). Power Supply Input. Supply Voltage. Loop Compensation Cap. Fault Timer. Open Lamp Detect (Lamp Voltage Feedback). Shorted Lamp Detect (Secondary Current Feedback). Small Signal Ground (Connect the Exposed Pad to Pin 20). www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 3 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS BLOCK DIAGRAM Vdd 6, 15 DBrt 4 Bosc 3 ENABLE BURST DIMMING RAMP OSCILLATOR + En 20 AGnd VDRV -- 5 REF 10 BtL BURST DIMMING CLOCK 7 Batt 8 OutL + -+ -CONTROL LOGIC 9, 12 PGnd -+ 13 OutR -+ 14 Batt 11 BtR SHORT CIRCUIT FT 17 PROTECTION + -- 19 ISFB 1.2V OPEN LAMP FAULT (OLF) + -- Comp 16 COMP 18 VLFB -GM HALF WAVE RECTIFIER + 2 IL 1 Abrt MP1026_BD01 Figure 1—Functional Block Diagram MP1026 Rev. 1.6 9/24/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 4 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS APPLICATION INFORMATION Brightness Control The MP1026 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 below. The MP1026 has a soft on and soft off feature to reduce noise, when using burst mode dimming. 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: ⎤ ⎡⎡ 1 ⎤ − 1) ⎥ ⎥ ⎢ ⎢ 1.68 × ( DMIN ⎢⎢ ⎥ + 4⎥ ⎥ ⎢⎢ 0.42 ⎥ ⎥ ⎢⎢ ⎥ ⎦ ⎣ ⎦ ⎣ Rbosc = −6 350 × 10 3. Select a burst frequency and find TTOTAL where: TTOTAL = 1/burst frequency. (1 − DMIN ) 0.42 × Rbosc × fbosc In a typical application, Rbosc=470kΩ and Cbosc=22nF. MP1026 Rev. 1.6 9/24/2007 Pin Connection Pin 1 Pin 4 Pin 3 ABrt DBrt Bosc 0 – 1.9V VRef AGnd Rbosc VRef 0 – 1.8V Cbosc VRef PWM Rsfb > 1.5V 1 .2 V = 1.7kΩ 0.7mA The recommended value is 3.9kΩ to 10kΩ (typically 4.7kΩ). Csfb < Table 1—Function Mode Analog Mode Burst Mode with DC input voltage Burst Mode from external source 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 peak ISFB voltage is below 1.2V. If a fault condition occurs that increases the secondary current, then the voltage at ISFB will be greater than 1.2V. When that occurs, 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. Sensing network: Rsfb, Risb, Csfb and Cisb. Where fbosc is burst frequency rate in Hz and Tmin is the Minimum burst time in sec. Function Fault Protection 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 ±2.5V. 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. The following is the design reference for the secondary winding current. Then determine Cbosc by the formula: Cbosc = Brightness Polarity: Burst: 100% duty cycle is at 1.8V Analog: 1.9V is maximum brightness 0.7 mA KHz = 93nF 1 . 2 V × 2π Select a capacitor with less than 93nF capacitance for Csfb and make the FB pin voltage peak value around 0.9V in normal operation. The 0.7mA DC and 0.7mA/KHz AC current values are taken from the UL60950 safety requirement. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 5 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS Cisb and Risb make up a high-pass filter, wherein the corner frequency should be between 1KHz and 2KHz so as to minimize the attenuation of the AC signal. The recommended value for Risb is 100kΩ. 1 1.6nF = > Cisb 2π × Risb × 1KHz 1 Cisb > = 0.8nF 2π × Risb × 2KHz A typical value for Cisb is 1.2nF. 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 VDD to 0V. For open lamp time: T(open _ lamp ) = C ft (µF) × 1.2V 1µA For secondary short turn off time: T(short ) = C ft (µF) × 1.2V 120µA 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: There is no impact on the open lamp time. The secondary short turn off time is: T(short ) = C ft 2 (µF) × 1.2V 120µA With a smaller capacitor value for Cft2 (when compared to Cft), the turn off time for the secondary short will be further reduced. Lamp Startup The strike voltage of the lamp will always be guaranteed at any temperature because the MP1026 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. ESD Resistor It is recommended that a resistor (RIL=470Ω~1kΩ) be added in series with the lamp current feedback as shown in Figure 3. The addition of this resistor helps minimize the possibility of ESD damage in case of mishandling of the IC during board level assembly and test. MP1026 IL MP1026_F03 FT Cft Figure 3—ESD Resistor Cft2 MP1026_F02 Figure 2—Turn Off Time Adjustment MP1026 Rev. 1.6 9/24/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 6 MP1026 – CCFL DRIVER FOR HANDHELD DISPLAY APPLICATIONS PACKAGE INFORMATION TSSOP20F 0.0256(0.650)TYP 0.004(0.090) 0.010(0.250) GATE PLANE 0.105 (2.67) 0.118 (3.00) pad width 0.169 0.177 0.244 0.260 (4.300) (4.500) (6.200) (6.600) 0.004(0.090) 0o-8o 0.018(0.450) 0.030(0.750) DETAIL "A" 0.039(1.000)REF 0.030(0.750) SEE DETAIL "B" PIN 1 IDENT. 0.150 (3.80) 0.165 (4.19) pad length 0.030(0.750) 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) 0.047(1.200) max 0.007(0.190) 0.012(0.300) SEATING PLANE 0.002(0.050) 0.006(0.150) NOTE: 1) Control dimension is in inches. Dimension in bracket is millimeters. 0.004(0.090) 0.008(0.200) 0.004(0.090) 0.006(0.160) 0.007(0.190) 0.010(0.250) DETAIL "B" NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. MP1026 Rev. 1.6 9/24/2007 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2007 MPS. All Rights Reserved. 7
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