System Power Supply for TV Series FET Controller Type 3ch System Power Supply ICs No.09034EAT06 BD8628EFV, BD8624EFV ●Description BD8628EFV / BD8624EFV have 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) 11ch synchronous rectification step-down system DC/DC converter 2) Soft start, soft off function 3) Built-in low voltage / overvoltage protection function 4) Built-in overcurrent protection function 5) Frequency setting by external resistance is available. (RT terminal) 6) Protection time setting by external resistance is available. (RSET terminal) 7) Built-in RT / RSET terminal open/short protection function 8) Protection control with built-in sequencer 9) Built-in adjustment function time of off latch 10) Built-in error state detection signal output function 11) Built-in tracking function 12) Corresponded to protecting bus 13) Load current Maximum 3A 14) HTSSOP-B24 Package www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Electric characteristic (Ta=25℃, VCC=6.5V, GND=0V,CTL=6.5V unless otherwise specified.) specification value Parameter Symbol MIN TYP MAX Circuit current 1 IQ1 0 10 Circuit current 2 IQ2 3.4 < Error amplifier part > UNIT μA mA Standard voltage (VREF) VREF 0.792 0.8 0.808 V Terminal FB Input bias current Terminal FC Clamping voltage H Terminal FC Clamping voltage L Terminal FC Sink current Terminal FC Source current Open loop gain <OSC part> IFBB VFCH VFCL IFCSINK IFCSOURCE AVERR -1 1.8 0.5 - 0 100 1 0.2 -70 - μA V V mA μA dB FOSC 400 500 600 kHz Oscillation frequency Condition CTL=0V CTL=VCC Terminal FB and FC terminal short VFB=0.9V VFB=0.7V VFB=0.9V VFB=0.9V, VFC=0.4V VFB=0.7V, VFC=1.6V When terminal RT 27kΩ is connected <Soft start > Charging current ISS -3 -2.5 -2 μA VSS=1.0V Terminal SS Threshold voltage VSSTH 0.98 1.08 1.18 V VSS Voltage Terminal SS Clamping voltage VSSCLM 2.2 2.4 V Terminal SS Standby voltage VSSSTB 0.1 0.15 V VSS Voltage (L to H) Terminal SS Discharge resistance RSS 49 70 91 kΩ CTL=0V Terminal SS Protection circuit start VSSPON 1.0 1.1 1.2 V VSS Voltage (L to H) voltage Terminal SS Protection circuit start 10 100 200 mV VSS Voltage voltage VSSPON_HYS Maximum hysteresis error < Low voltage, over voltage detection part> Terminal FB Low voltage detection 0.51 0.56 0.61 V VFB Voltage VLVP voltage Terminal FB Overvoltage detection VOVP 0.86 0.96 1.06 V VFB Voltage voltage < Over current detection part> Output current limitation threshold Ilmt VCC-0.9 VCC-0.7 VCC-0.5 V VSW Voltage <Power MOS> mΩ Upper side MOS ON resistance RONU 110 VBOOT-VSW =5V Lower side MOS ON resistance RONL 110 mΩ VVREG5=5V <Others> Terminal PDET L output voltage VOL_PDET 0.4 V IOL=100uA Terminal CTL input voltage H level VIH_CTL 2.0 VCC V voltage CTL terminal Terminal CTL input voltage L level 0.5 V VIL_CTL CTL terminal voltage Terminal CTL input current II_CTL 60 90 μA CTL terminal, CTL=VCC VFB : FB terminal voltage, VFC : FC terminal voltage, VSS : SS terminal voltage, VMONVCC : MONVCC terminal voltage Not designed for radiation resistance. Current capability should not exceed Pd. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 2/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV Permissible loss This package is a product of which the feature is the high heat radiation, and connect the back to GND based on recommended land pattern when you mount. T j max T cmax θ jc [ ℃ /W] 19.0 θ ja [ ℃ /W] 31.3 T STGmin T STGmax T a min T a max [℃ ] [℃ ] [℃ ] [℃ ] -50.0 150.0 -45.0 85.0 Destruction temperature Destruction temperature [℃] [℃] 150.0 150.0 Permissible loss ： Pd [W] 5 4 ROHM standard substrate mounting θja=31.3℃/W 3 2 1 0 0 25 50 75 100 125 150 Ambient temperature ： Ta [℃] ROHM standard substrate specification Material 4 layer glass epoxy substrate(back copper foil70mm x 70mm) Size 70mm x 70mm x 1.6mmt(Sarmalbiaing is in the substrate.) Figure.1 Heat decrease curve ※These values are the actual measurement values, and no guarantee values. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 3/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Block diagram RT VREF RT OPEN/SHORT SS OSC 12 OSC RSET FB time 1 4 11 1 3 OSC OVP LVP PDET FC 10 1 5 PIO PROTECT BUS I/F SEQ Control GND ９ 1 6 VREG5 CTL VREG5 VCC ８ 1 7 CTL BOOT ７ 18 Driver Control PVCC SW ６ 19 PVCC SW ５ 20 TEST2 N.C. ４ 21 TEST1 N.C. ３ 22 PGND N.C. ２ 23 PGND N.C. １ 24 Figure.2 Block diagram, Application diagram ●Terminal explan ation Table 1 Terminal explanation No. Symbol 1 PGND 2 PGND 3 N.C. 4 N.C Description No. Symbol Power GND terminal 13 RT Power GND terminal 14 RSET 15 PDET 16 PIO No wire connection. (Connect to GND. ) No wire connection. (Connect to GND. ) SW terminal Description Frequency adjustment resistance connection terminal Off latch effective time adjustment resistance terminal Error state notification terminal 17 CTL Error state notification and external IC error detection terminal Enable input SW terminal High side Power MOS gate drive power source terminal Internal power supply (5.0V) output terminal GND 18 VCC VCC power supply terminal 19 PVCC Power VCC terminal 20 PVCC Power VCC terminal 21 TEST2 Test terminal (Connect to GND. ) FC Phase amends terminal 22 TEST1 11 FB Feedback terminal 23 N.C. 12 SS Soft start adjustment capacity connection terminal 24 N.C. Test terminal (Connect to GND. ) No wire connection. (Connect to GND. ) No wire connection. (Connect to GND. ) 5 SW 6 SW 7 BOOT 8 VREG5 9 GND 10 ※Please give to VCC+0.3V as an operation condition in all input terminals except the terminal BOOT. However, please do not exceed the absolute maximum rating as VCC=PVCC. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 4/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Terminal equivalent circuit chart Terminal No. Terminal name 1 PGND 2 PGND Explanation Terminal equivalent circuit chart Power GND (The same potential as the GND terminal) Power GND (The same potential as the GND terminal) PVCC 5 SW PVCC SW terminal ⑤ ⑥ 6 SW SW terminal PGND VREG5 7 BOOT High side Power MOS gate drive power source terminal ⑦ PGND 8 VREG5 9 GND 10 FC Internal power supply (5.0V) output terminal GND Phase amends terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV Terminal No. Terminal name Explanation Terminal equivalent circuit chart VCC VCC 11 FB Voltage detection terminal ⑪ GND 12 SS Soft start adjustment capacity connection terminal 13 RT Frequency adjustment resistance connection terminal 14 RSET Off latch effective time adjustment resistance terminal 15 PDET Error state notification terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 6/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV Terminal No. Terminal name 16 PIO Error state notification and external IC error detection terminal 17 CTL Enable input 21 TEST2 Test terminal (Connect to GND. ) 22 TEST1 Test terminal (Connect to GND. ) 19 PVCC Power VCC terminal 20 PVCC Power VCC terminal Explanation www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Terminal equivalent circuit chart 7/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Operation description ON/OFF control DC/DC converter ON/OFF function DC/DC converter controller can be controlled ON/OFF by CTL terminal. Analog circuit starts operation at ON control (on mode), and goes down to setting output voltage. Analog circuit should be standby at OFF control (off mode), and output voltage becomes 0V. Table2 DC/DC converter ON/OFF function CTL terminal voltage >VIHCTL ON control <VILCTL OFF control Soft start time set function DC/DC converter can do soft start without overshoot by charging soft start capacity (Css) connected between SS terminal and GND by charging current at ON control. The mute of the output is released when it reaches VSS=0.15V (VSSSTB), and the output voltage does the soft start operation from the point of VSS=0.3V (typ) in proportion to the voltage of the terminal SS. Also, soft start time (tss) can be set by setting soft start capacity arbitrarily. Soft start time (tss) should be set at 3msec < tss < 30msec. ※Please note that the overshoot is not caused in the output setting voltage when setting it to tss≦3msec. t SS VSSTH CSS ISS Discharge function DC/DC converter can do soft off by discharging load discharged to soft start capacity connected between SS terminal to GND by discharging resistance at OFF control. Soft off operates in proportion to the voltage of the terminal SS the output voltage from the point of VSS=0.8V (typ). Figure.3 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. Wave form at ON/OFF control 8/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV OSC oscillation frequency setting function SW output oscillation frequency of DC/DC converter can be set by installing resistance between RT terminal and GND externally. Switching frequency [KHz] 10000 1000 100 10 1 10 100 1000 *Reference date RT resistance[KΩ] Figure.4 terminal Terminal RT resistance-oscillation frequency Range of terminal RT connection resistance setting 23kΩ≦Rrt≦135kΩ (100kHz≦fosc≦600kHz) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 9/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV PROTECT BUS Input/output function The terminal PIO is PROTECT BUS Input/output terminal. The terminal PIO is Hi-Z when DC/DC usually operates. When the terminal PIO becomes LOW by connecting PROTECT BUS, DC/DC is turned off. Afterwards, when the terminal PIO becomes HIGH, it reactivates. DC/DC is Off latch when DC/DC error detects it and the terminal PDET becomes LOW. Table3 PIO terminal, PDET terminal output function DC/DC Error detection Undetection Undetection Detection PIO terminal PDET terminal DC/DC Hi-Z LOW LOW Hi-Z Hi-Z LOW ON OFF Off latch PROTECT BUS Timing chart If two or more BD8628EFV//BD8624FV is connected in PROTECT BUS, and it uses at the same time, when one IC error detects, all remaining IC becomes PIO = Low at the same time, and the output is turned off. Protecting BUS part timing chart IC_A detects error. OFF LATCH IC_A PDET High PIO LOW High IC_A PIO IC_A PIO IC_B PIO LOW High LOW IC_B IC_B Vo DC/DC OFF 0V High IC_B PDET When two or more BD8628EFV/BD8624FV is used at the same time, If one IC error detects, all IC becomes DC/DC OFF at the same time. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 10/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Protection function Protection circuit is effective for destruction prevention due to accident so that avoid using by continuous protection operation. Low voltage protection function(LVP) Low voltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter compared to internal reference level. Low voltage protection function operates when FB terminal voltage falls below VLVP (=0.7 x VREF) and continues more than set time in external resistance. Table 4 Low voltage protection function Low voltage Low voltage SS terminal FB terminal protection function protection operation <VLVP ON >1.1V(typ) Enable >VIHCTL >VLVP+VLVP_HYS OFF <1.0V(typ) Disable OFF <VILCTL Disable OFF ※Constant voltage protection function is enabled when SS terminal voltage becomes more than 1.1V (typ) in the transition to ON control (during soft start). CTL terminal Overvoltage protection function (OVP) Overvoltage protection function detects set output voltage VO from FB terminal and off-latched DC/DC converter controller compared to internal reference level. Overvoltage protection function operates when FB terminal voltage exceeds VOVP (=1.2 x VREF) and continues more than set time in external resistance. Table 5 Overvoltage protection function Overvoltage protection Overvoltage protection SS terminal FB terminal function operation >VOVP ON >1.1V(typ) Enable >VIHCTL <VOVP OFF <1.0V(typ) Disable OFF <VILCTL Disable OFF ※Overvoltage protection function is enabled when SS terminal voltage of each Ch becomes more than 1.1V (typ) in the transition to ON control (during soft start). CTL terminal VFB 1.2×VREF FB terminal voltage 0.7×VREF+VLVP_HYS VREF 0.7×VREF 0 Protection ON OFF LVP PDET terminal OVP LVP Hi-Z LOW Figure.5 Low voltage / overvoltage protection www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 11/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV Overcurrent protection function (OCP) Overcurrent protection function compared drain voltage (LX terminal voltage) with internal OCP terminal voltage when internal Nch POWER MOS is ON. When LX terminal voltage becomes lower than OCP terminal voltage, external MOS would be OFF. Off latch by overcurrent protection function operates when LX terminal voltage falls below OCP terminal voltage and continues more than set time in external resistance. CTL terminal >VIHCTL <VILCTL SS terminal >1.1V(typ) <1.0V(typ) - Table 6 overcurrent protection function Overcurrent Output current protection function >Ilmt Enable <Ilmt Disable Disable Overcurrent protection operation ON OFF OFF OFF LX terminal voltage OCP terminal voltage Immediately off. Immediately off. Immediately off. DRVA DRVB Output current Protection To an off latch in continuance of set time (typ) in external resistance Set time in external resistance Output current Rocp LX ON OFF OCP Off operation immediately Off latch Figure.6 Overcurrent protection RT terminal open/short protection function RT terminal open/shot protection function off-latches all DC/DC converter controller by detecting open/short condition internally from RT terminal to prevent from output voltage error caused by error oscillation of internal triangular wave at RT terminal open/short. RT terminal open/short protection function is regularly enabled after boot-up. RT terminal open/short protection function operates when error detection condition continues more than set time in external resistance. www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 12/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV Soft start time-out function DC/DC converter off-latch-controls when VSS does not exceed VSSPON from VSS > VSSSTB+VSSSTB_HYS after 50msec (typ) passed from soft start. VSSCLM VSSPON SS terminal VSSSTB+VSSSTB_HYS 0V Figure.7 About 50msec（ｔｙp） At soft start time-out Error detection (off latch) release method DC/DC converter becomes off latch condition when protection function operates. Off latch can be released by the following method. DC/DC converter controller of each Ch becomes able to do ON control transition by releasing off latch. 1. Set all Ch CTL terminal voltage as < VILCTL and continue that condition about more than 200usec (typ). 2. Drop down power supply VCC to below 2.7V(TYP). Error detection time set function Time from the error detection to the off latch can be set by putting resistance outside between GND and RSET terminal. t offlatch 1.8 103 Rrset [usec] Rset setting range 10kΩ≦Rset≦75kΩ (18usec≦tofflach≦135usec) www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 13/14 2009.05 - Rev.A Technical Note BD8628EFV, BD8624EFV ●Ordering part number B D 8 Part No 6 2 8 E Part No. 8628 8624 F V - Package EFV: HTSSOP-B24 E 2 Packaging and forming specification E2: Embossed tape and reel HTSSOP-B24 <Tape and Reel information> <Dimension> 7.8 ± 0.1 0.53 ± 0.15 1 ± 0.2 13 7.6 ± 0.2 5.6 ± 0.1 24 4 +6 −4 1 12 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) 1234 1234 www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 1234 （Unit:mm) 1pin 1234 Reel 1234 0.08 M 1234 +0.05 −0.04 2000pcs 1234 0.2 Quantity Direction of feed +0.05 0.17 −0.03 0.08 S 0.65 Embossed carrier tape 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. 14/14 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. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). 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