MP3356 High Voltage Photo Flash Charger and IGBT Driver for DSC The Future of Analog IC Technology DESCRIPTION FEATURES The MP3356 is a fast, highly efficient and precision high voltage photo-flash charger for DSC xenon flash. • • • • • The MP3356 has a peak current of 1.5A. A 50V, 0.5Ω internal power switch lowers transformer turns ratio and switching losses associated with the primary leakage inductance and winding capacitance. Integrated secondary feedback resistors provide +/-2.5% output voltage charge accuracy. MP3356 also has an integrated IGBT driver. Integrated 50V, 0.5Ω Power Switch 1.5A peak current limit 2.5% Charge Accuracy <1uA Shutdown Current Integrated IGBT Driver APPLICATIONS • • Digital Still Cameras Optical Film Cameras “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc. MP3356 is available in the 10-pin, 2X2 flip chip package. TYPICAL APPLICATION VIN GND U1 VIN VIN SW AGND CHAG EN PG PG MP3356 FB 5, 6, 7, 8 IGBTIN MP3356 Rev. 0.91 1/29/2010 IGBTOUT 4 1, 2, 3 IGBTIN PGND www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 1 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC ORDERING INFORMATION Part Number* MP3356DG Package 10-pin, 2x2 Flip QFN Top Marking Free Air Temperature (TA) 4PY –40°C to +85°C * For Tape & Reel, add suffix –Z (e.g. MP3356DG–Z). For RoHS Compliant Packaging, add suffix –LF (e.g. MP3356DG–LF–Z) PACKAGE REFERENCE TOP VIEW VIN 10 IGBTIN 1 9 VIN IGBTOUT 2 8 AGND SW 3 7 PGND PG 4 6 EN 5 FB ABSOLUTE MAXIMUM RATINGS (1) VIN to AGND.......................................-0.3Vto 6V EN, IGBTIN, IGBTOUT, PG to AGND-0.3Vto 6V FB to AGND ...................................-60V to 350V SW to AGND...................................-0.3V to 50V PGND to AGND ……………………-0.3V to 0.3V Storage Temperature............... -55°C to +150°C Continuous Power Dissipation (TA = +25°C) (2) …………………………………………..…....1.6W Junction Temperature ............................ +150°C Lead Temperature (Solder).....................+260°C Recommended Operating Conditions (3) Supply Voltage VIN .............................2.8V to 6V Operating Junct. Temp (TJ)..... –40°C to +125°C MP3356 Rev. 0.91 1/29/2010 Thermal Resistance (4) θJA θJC 2x2 Flip Chip ...........................80 ...... 16 ... °C/W Notes: 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX), the junction-toambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable continuous power dissipation at any ambient temperature is calculated by PD (MAX) = (TJ (MAX)-TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 2 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC ELECTRICAL CHARACTERISTICS VIN = VEN = 3.6V, TA = +25°C, unless otherwise noted. Parameter Photoflash Capacitor Charger VIN Voltage Range VIN UVLO VIN Quiescent Current VIN Quiescent Current Shutdown Current from VIN VSW Leakage Current SW ON Resistance between SW and PGND EN Input High Voltage EN Input Low Voltage Pull-down Resistance of EN pin IPEAK Charge completion detect voltage at FB FB Resistance DCM Comparator threshold PG Leakage Current PG Output Low Voltage MAX TON Thermal Shutdown IGBT Driver IGBTOUT pull-up ON resistance IGBTOUT pull-down ON resistance IGBTIN Input High Voltage IGBTIN Input Low Voltage Propagation delay IGBTOUT rise time IGBTOUT fall time Pull down resistance of IGBTIN MP3356 Rev. 0.91 1/29/2010 Conditions Min Typ 2.8 Rising edge, hysteresis = 200mV typical V(EN)=High, V(FB) = 0 V(EN)=High, V(FB) = 336V V(EN)=Low, VIN =3.6V VIN=3.6V, VSW=50V, in Shutdown 1 Switch turn-on, ISW=100mA ,VIN=3.6V Max Unit 6 V 2.5 V 2 100 1 1 mA µA µA µA Ω 0.5 2.4 1.2 100 1.5 1.7 V V kΩ A 294 302 310 V 1 kΩ V µA 0.6 V(EN)=3.6V Peak Current Limit V(FB)=30V 315 5 V(PG)=3.6V ISINK= 2mA Maximum TON time Rising edge, hysteresis = 15oC 70 150 0.1 V µS o C 6 Ω 6 Ω 2.4 IGBTIN rising/falling edge to IGBTOUT rising/falling edge, Cgate=6800pF Cgate=6800pF Cgate=6800pF 130 180 90 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 0.6 V V 40 nS nS nS kΩ 3 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC PIN FUNCTIONS Pin # 1 2 3 Name IGBTIN IGBTOUT SW 4 PG 5 FB 6 EN 7 8 PGND AGND 9,10 VIN MP3356 Rev. 0.91 1/29/2010 Description Logic Input Pin for IGBT Drive. Output Drive for IGBT Gate. Connect this pin to the gate of the IGBT. Switch Pin. This is the drain of the internal power switch. Open-Drain Power-Ready Output. PG becomes low when the output voltage is reached. Feedback Pin. Its trip voltage is 300V Charge Enable Pin. A low to high transition on this pin puts the part into power delivery mode. Once the target voltage is reached, the part will stop charging the output. Toggle this pin will start charging again. Bring this pin low will terminate the power delivery and put the part in shutdown. Power Ground Analog ground. Tie it directly to local ground plane. Input Supply Pin. Connect it to system supply voltage. Bypass VIN to AGND with a 0.1uF or greater ceramic capacitor. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 4 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC TYPICAL PERFORMANCE CHARACTERISTICS TA = +25°C, unless otherwise noted. Vin=3V, Iset=1.5A with 1:8 transformer 3900 3600 Iset=1.5A, Cout=100uF, Vo=300V 3300 3000 2700 2400 2100 1800 1500 1200 900 Iset=1.5A, Cout=47uF, Vo=300V 600 2.5 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V) 85 80 Vin=6V, Lpri=9.8uH 75 70 Vin=4.5V, Lpri=9.8uH 65 60 Vin=3V, Lpri=9.8uH 55 50 45 40 70 110 150 190 230 270 310 OUTPUT VOLTAGE (V) Line Regulation NORMALIZED OUTPUT VOLTAGE(V) Efficiency EFFICIENCY (%) CHARGE TIME (ms) Charge Time vs. Input Voltage 1.001 1 0.999 Iset=1.5A, Cout=47uF, Vo=300V 0.998 0.997 0.996 0.995 0.994 0.993 2.5 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V) Output Voltage vs. Input Voltage OUTPUT VOLTAGE(V) 295.2 294.9 Iset=1.5A, Cout=47uF, Vo=300V 294.6 294.3 294 293.7 293.4 293.1 2.5 3 3.5 4 4.5 5 5.5 6 6.5 INPUT VOLTAGE (V) MP3356 Rev. 0.91 1/29/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 5 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC TYPICAL PERFORMANCE CHARACTERISTICS (continued) TA = +25°C, unless otherwise noted. MP3356 Rev. 0.91 1/29/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 6 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC BLOCK DIAGRAM SW PG Delay 300ns EN S Q R Q + - + - One Shot Q S Q R VIN + - VILIM 27mV FB 1.2V IGBTIN IGBTOUT Figure 1—Functional Block Diagram MP3356 Rev. 0.91 1/29/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 7 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC OPERATION The MP3356 controlled flyback charger operates in critical conduction mode with 1.5A peak current. The output voltage is divided down through an internal 300: 1 resistive divider from the positive terminal of the transformer secondary (FB pin) and compares it with an internal 1.2V reference. The low to high transition of the EN pin will enable the flyback converter to switch. A constant TOFF of 20µs is used when the output voltage is below 20V to avoid inrush current. The boundary mode operation will follow to minimize charge time when the output voltage is above 20V. A minimum TOFF of 200ns serves as MP3356 Rev. 0.91 1/29/2010 blanking for turn off transition. The circuit will stop switching and PG will be pulled low once the flash capacitor is charged to 300V. This value is set by the internal 300:1 R divider and the 1.2V reference. When charge is complete, the part will shut down its internal circuitry and draw less than 100uA drawn from Vin. The EN pin will restart the charge. Bringing the EN pin low terminates the power delivery and puts the part in shutdown. A maximum TON timer prevents pulling current from a depleted battery. If the ON time exceeds the maximum TON, the switch is forced OFF regardless of IPEAK detection. www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 8 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC APPLICATION INFORMATION Charge Speed The output capacitor determined by: Tch arg e ∝ charging speed is ILIM VIN + N VOUT Primary Inductance The primary inductance is calculated based on the minimum off time period: V T Iprimary ≥ OUT min,off NIPEAK VOUT: output voltage about 300V TMIN-OFF Minimum off time 200ns. IPEAK: primary peak current MP3356 Rev. 0.91 1/29/2010 Turns Ratio The minimum turns ratio transformer is obtained as: VOUT N≥ Vds − VIN VDS: FET drain-source voltage VIN: Input voltage 3~5V of the flyback Output Diode Selection The reverse voltage of the output diode is determined by: VD = VOUT + NVIN www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 9 MP3356 – HIGH VOLTAGE PHOTO FLASH CHARGER AND IGBT DRIVER FOR DSC PACKAGE INFORMATION QFN 10 (2mm×2mm) NOTICE: The information in this document is subject to change without notice. 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. MP3356 Rev. 0.91 1/29/2010 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2010 MPS. All Rights Reserved. 10