BD8628EFV

System Power Supply for TV Series FET Controller Type 3ch System Power Supply ICs BD8628EFV, BD8624EFV No.09034EAT06 ●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 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 > Standard voltage (VREF) 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 Oscillation frequency VREF IFBB VFCH VFCL IFCSINK IFCSOURCE AVERR FOSC 0.792 -1 1.8 0.5 400 0.8 0 100 500 0.808 1 0.2 -70 600 Technical Note UNIT μA mA V μA V V mA μA dB kHz 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 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 mΩ Upper side MOS ON resistance RONU 110 VBOOT-VSW =5V Lower side MOS ON resistance RONL 110 mΩ VVREG5=5V 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 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 cmax θ jc [ ℃ /W] θ ja [ ℃ /W] T STGmin [℃ ] T STGmax [℃ ] T a min [℃ ] T a max [℃ ] Destruction temperature [℃] 19.0 31.3 -50.0 150.0 -45.0 85.0 150.0 Technical Note T j max Destruction temperature [℃] 150.0 5 4 3 2 1 0 Permissible loss ： Pd [W] ROHM standard substrate mounting θja=31.3℃/W 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 BD8628EFV, BD8624EFV ●Block diagram RT OSC OSC RT OPEN/SHORT VREF OSC Technical Note SS 12 RSET PDET PIO 1 6 1 5 PROTECT BUS I/F OVP LVP FC 10 SEQ Control GND VREG5 ９ CTL CTL VREG5 VCC PVCC PVCC TEST2 TEST1 N.C. N.C. 24 23 22 21 20 19 18 Driver Control BOOT SW SW ５ ６ ７ N.C. N.C. PGND PGND １ ２ ３ ４ Figure.2 Block diagram, Application diagram ●Terminal explan ation Table 1 Terminal explanation No. 1 2 3 4 5 6 7 8 9 10 11 12 Symbol PGND PGND N.C. N.C SW SW BOOT VREG5 GND FC FB SS Description Power GND terminal Power GND terminal No wire connection. (Connect to GND. ) No wire connection. (Connect to GND. ) SW terminal SW terminal High side Power MOS gate drive power source terminal Internal power supply (5.0V) output terminal GND Phase amends terminal Feedback terminal Soft start adjustment capacity connection terminal No. 13 14 15 16 17 18 19 20 21 22 23 24 Symbol RT RSET PDET PIO CTL VCC PVCC PVCC TEST2 TEST1 N.C. N.C. Description Frequency adjustment resistance connection terminal Off latch effective time adjustment resistance terminal Error state notification terminal Error state notification and external IC error detection terminal Enable input VCC power supply terminal Power VCC terminal Power VCC terminal Test terminal (Connect to GND. ) Test terminal (Connect to GND. ) No wire connection. (Connect to GND. ) No wire connection. (Connect to GND. ) ※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. 11 ８ time 1 3 1 4 1 7 FB 4/14 2009.05 - Rev.A BD8628EFV, BD8624EFV ●Terminal equivalent circuit chart Terminal No. 1 2 Terminal name PGND PGND Explanation Power GND (The same potential as the GND terminal) Power GND (The same potential as the GND terminal) PVCC PVCC Technical Note Terminal equivalent circuit chart 5 SW 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 Internal power supply (5.0V) output terminal 9 GND GND 10 FC Phase amends terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 5/14 2009.05 - Rev.A BD8628EFV, BD8624EFV Terminal No. Terminal name Technical Note 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 BD8628EFV, BD8624EFV Terminal No. Terminal name Technical Note Explanation Terminal equivalent circuit chart 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 20 PVCC PVCC Power VCC terminal Power VCC terminal www.rohm.com © 2009 ROHM Co., Ltd. All rights reserved. 7/14 2009.05 - Rev.A 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 VIHCTL >VLVP+VLVP_HYS OFF 1.1V(typ) Enable >VIHCTL