System Power Supply for TV Series FET Controller Type 3ch System Power Supply ICs No.09034EAT05 BD8627EFV ●Description BD8627EFV has realized the high performance and reliability required as a power supply for thin-screen TV. With built-in FET 1ch current mode control, the DC/DC Converter series has the advantage of high-speed load response and wide phase margin. Due to the high-speed load response, it is most suitable for TV-purpose processors with increasingly high performance, and due to the wide phase margin it leaves a good margin for board pattern & constant setting and so facilitates its application design. As a high-reliability design, it has various built-in protection circuits (overcurrent protection, output voltage abnormal protection, thermal protection, and off-latch function at the time of abnormality etc.), therefore as an advantage it does not easily damage in every possible abnormal condition such as all-pin short circuit test etc. and hence most suitable for thin-screen TV which requires the high reliability. ●Features 1) High efficiency in all load area 2) 3.0A output current 3) Low RDS(ON) internal switches (PchMOS:85mΩ, NchMOS:65mΩ) 4) ±1% reference voltage accuracy 5) Programmable frequency : 250kHz-1MHz 6) Terminal RT OPEN/SHORT detecting function 7) Over current protection function 8) Output over voltage/low voltage protection function (over : FB > VREF +60mV , low : FB < VREF -60mV) 9) Timer off latch function in abnormal circumstances 10) Thermal shutdown function 11) Under voltage protection 12) Soft start/start delay circuit 13) Soft start time out function 14) HTSSOP-B20 package www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/12 2009.05 - Rev.A Technical Note BD8627EFV ●ABSOLUTE MAXIMUM RATING (Ta=25℃) Parameter Input supply voltage Input terminal voltage Output terminal voltage Output current Power dissipation Operating temperature Storage temperature Symbol VIN VINP*1 VOUT*2 IOUT Pd Topr Tstg Limits 7 VIN VIN 4 3.2＊3 -10 ～ 85 -55 ～ 150 Unit V V V A W ℃ ℃ ＊1 VINP Application terminal： EN, SS/DELAY, TEST, FB ＊2 VOUT Application terminal： SW, PDET, FC, RT, REG ＊3 (70mm x 70mm, thickness 1.6mm, and four layer glass epoxy substrates) When mounting substrate and the package back exposure part are connected with solder. Operating at higher than Ta=25℃, 25.6mW shall be reduced per 1 Parameter Input supply voltage Output current www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Operation condition Symbol MIN VIN 4.5 IOUT - 2/12 TYP - MAX 6.0 3.0 Unit V A 2009.05 - Rev.A Technical Note BD8627EFV ● Electrical characteristic (Unless otherwise noted Ta=25℃, VIN=5.6V) Specification value UNIT Condition MIN TYP MAX VIN supply current (operating) IQ_active 1.3 2.0 mA VFB = 0.83V, VFC = 1V VEN = 0V μA VIN supply current (standby) IQ_stby 350 700 Reference voltage (VREF) VREF 0.792 0.8 0.808 V Output rise detection voltage VOVP 30 60 90 mV Monitoring FB terminal Output decrease detection voltage VLVP -90 -60 -30 mV Monitoring FB terminal Terminal PDET output current IPDET 1 mA VPDET< 0.5V ROSC = 220kΩ Oscillation frequency fOSC 500 550 600 kHz Pch FET ON resistance RPFET 85 120 mΩ ISW = 1A Nch FET ON resistance RNFET 65 100 mΩ ISW = -1A UVLO voltage VUVLO 3.8 4.0 4.2 V μA SW leak current ILSW 0 1 VEN= 0V, VIN = 6V EN terminal H threshold voltage VENH 2.0 V EN terminal L threshold voltage VENL 0.5 V μA SS/DELAY terminal source current ISSSO 2 4 6 VFB :FB terminal voltage, VEN :EN terminal voltage, VFC :FC terminal voltage, VPDET: PDET terminal voltage Current capability should not exceed Pd. Parameter Symbol Permissible loss Permissible loss ： PD [W] 4 (70mm×70mm, thickness 1.6mm, and four layer glass epoxy substrates) When mounting substrate and the package back exposure part are connected with solder. 3 2 1 0 0 25 50 75 100 125 150 Surrounding temperature ： Ta [℃] Fig. 1 heat decrease curve www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/12 2009.05 - Rev.A Technical Note BD8627EFV 12 VIN 11 VIN SW 9 SW 10 14 VIN PGND 7 13 VIN 15 REG VIN REG Predrive en PWM CONTROL REG PGND 8 SW 5 Shut Down SW 4 Detect Abnormal Voltage and Start error Err AMP FB 2 PDET 3 REG 0.8V SGND 1 PGND 6 enable 16 EN 17 TEST 18 SS/DELAY 19 FC OSC REG 20 RT ● Block Diagram Fig.2 Block diagram ●Pin description No. Symbol 1 SGND 2 FB 3 PDET 4 5 6 7 8 9 10 11 12 13 14 15 16 17 SW SW PGND PGND PGND SW SW VIN VIN VIN VIN REG EN TEST 18 19 20 Description Signal GND terminal Feed back terminal Explanation Small signal system GND Output voltage detection Off latch signal output Reset output Output terminal Switching output Power GND terminal GND for power MOSFET Output terminal Power Mos output Power supply input terminal Power supply input. The decoupling is done to PGND Internal regulator Enable input TEST terminal Soft start adjustment capacity connection SS/DELAY terminal FC Error amplifier output Frequency adjustment resistance connection RT terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/12 Internal regulator ON/OFF control for device operation GND short in application set The soft start time is adjusted with the connected capacitor Error amplifier phase compensation point The switching frequency is set by the connected resistance 2009.05 - Rev.A Technical Note BD8627EFV ●Pin equivalence circuit diagram No. Symbol 1 SGND Explanation Terminal equivalent circuit diagram GND (connected 0V) VIN 2 FB Output voltage detection terminal 2 SGND 3 PDET 4,5,9,10 SW 6,7,8 PGND 11,12,13,14 VIN Off latch signal output terminal Output terminal Power GND (Same voltage as SGND) Power supply input terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/12 2009.05 - Rev.A Technical Note BD8627EFV No. Symbol Explanation Terminal equivalent circuit diagram VIN 15 REG VIN 15 Internal regulator output terminal SGND VIN 16 EN VIN 15 Enable terminal SGND www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/12 2009.05 - Rev.A Technical Note BD8627EFV No. Symbol Explanation Terminal equivalent circuit diagram VIN 18 SS Soft start time adjustment terminal 18 SGND 19 FC Error amplifier compensation terminal RT Oscillator frequency adjustment terminal VIN 20 20 SGND www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/12 2009.05 - Rev.A Technical Note BD8627EFV ● Operation description Enable control The device can be controlled ON/OFF by EN terminal (16 pin) voltage. An internal circuit starts when VEN reaches 0.65V. VEN EN terminal voltage VENTH 0 VSS VSSCLM SS terminal voltage VSSTH 0 VO Output setting voltage 0 tSS VPDET PDET 0 Fig.3 ON/OFF transition wave form in EN controlling Soft start time set function As for BD8627EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS and SGND terminal. Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 8/12 2009.05 - Rev.A Technical Note BD8627EFV OSC oscillation frequency setting function The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND (range = 250kHz - 1MHz) The relation between RT terminal resistance and the oscillation frequency follows Fig.4. 10000 Frequency [kHz] 1000 100 10 10 100 1000 10000 RT terminal resistance [kΩ] Fig. 4 RT resistance-oscillation frequency www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/12 2009.05 - Rev.A Technical Note BD8627EFV ● Protection function Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection operation. Low voltage protection function (LVP) The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF. If FB terminal voltage falls below VLVP(= VREF -60mV) and the state continues for 500us, output changes to low voltage and the state is fixed. In that case , PDET (3pin) output changes to L. Table 1 output low voltage protection function Low voltage protection Low voltage protection EN terminal SS terminal FB terminal function operation <VLVP ON >1.4V(typ) Effective >VIHEN >VLVP OFF <1.4V(typ) Invalidity OFF <VILEN Invalidity OFF ＊ Low voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start). Over voltage protection function(OVP) The voltage of the terminal FB is compared with internal reference voltage VREF. If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage and the state is fixed. EN terminal >VIHEN <VILEN Table 2 output over voltage protection function Over voltage SS terminal FB terminal protection function >VOVP >1.4V(typ) Effective <VOVP <1.4V(typ) Invalidity Invalidity Over voltage protection operation ON OFF OFF OFF ＊ Over voltage protection function is available when SS terminal voltage becomes more than 1.4V (typ) in the transition to ON control (during soft start). VFB VREF＋60ｍV FB terminal voltage VREF VREF-60ｍV 0 Protection PDET terminal ON OFF 500[us] 500[us] OVP LVP HIGH LOW Fig. 5 Output voltage error detection range www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/12 2009.05 - Rev.A Technical Note BD8627EFV Under voltage lock out protection (UVLO) As for BD8627EFV, the power-supply voltage decrease detection protection circuit is built in. It the input voltage decrease below the UVLO voltage (4.0V typ), the device state changes to the standby mode (Moreover, to prevent the chattering of the output) hysteresis width of 300mV(typ) has been installed in the UVLO cancel voltage. RT terminal open/short protection function (RTO/RTS) RT terminal opening/short protection function prevent the clock from abnormal oscillation. If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed. Terminal RT opening/short protection function is always effective after the power supply start-up. Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates when the state continues about 500μsec(typ). Soft start time-out function If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8627EFV controls an off latch. Vo is fixed in a low level. Fig. 6 Soft start time-out Error detection (off latch) release method BD8627EFV enters the state of an off latch when the protection function operates. To release the off latch state, EN terminal voltage should be changed to low level once time. Thermal shut down function Thermal shut down circuit (TSD circuit) is built into BD8627EFV. When the temperature of the chip exceeds Tjmax=175, the DC/DC converter is fixed in a low voltage. TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175. It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set. Over current protection function The over current protection function has been achieved by limiting the current that flows on high side MOSFET. The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about 500μsec(typ), the output is fixed in a low level. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/12 2009.05 - Rev.A Technical Note BD8627EFV ●Ordering part number B D 8 Part No 6 2 7 E Part No. F V - Package EFV: HTSSOP-B24 E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B20 <Dimension> <Tape and Reel information> 6.5 ± 0.1 11 6.4 ± 0.2 4.4 ± 0.1 0.5 ± 0.15 1.0 ± 0.2 20 1 10 Embossed carrier tape Quantity 2500pcs Direction of feed E2 (The direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand) 0.17 +0.05 −0.03 S 0.08 S 1234 1234 1234 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1pin 1234 （Unit:mm) 1234 Reel 1234 0.2 +0.05 −0.04 1234 0.65 1234 1.0Max. 0.85 ± 0.05 0.08 ± 0.05 0.325 Tape Direction of feed ※When you order , please order in times the amount of package quantity. 12/12 2009.05 - Rev.A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. 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