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2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 1/18 single-chip type with built-in fet switching regulator series flexible step-down switching regulators with built-in power mosfet bd9006f/hfp, bd9007f/hfp, bd9009hfp overview the high-accuracy frequency flexible step-down switching regu lator is a switching regulator with built-in power mos fet, which withstands high pressure. the operational frequency is freely configurable with external re sistance. it features a wide input voltage range (7v~35v) and a high frequency accuracy of 5% (bd9006f/hfp,bd9009hfp, f=200~500khz), furthermore, an external synchronization input pin enables synchronous operation with external clock. features 1) minimal external components 2) wide input voltage range: 7v 35v 3) frequency voltage accuracy: 5%(bd9006f/hfp,bd9009hfp, f=200 500khz) 20%(bd9007f/hfp) 4) built-in p-ch power mos fet 5) output voltage setting enabled with external resistor: 0.8v v in 6) reference voltage accuracy: 0.8v2% 7) wide operating temperature range: -40 +105 8) low dropout: 100% on duty cycle 9) standby mode supply current: 0a (typ.) 10) oscillation frequency variable with external resistor: 50 500khz 11) external synchronization enabled 12) soft start function: soft start time fixed to 5ms (typ.) 13) built-in overcurrent protection circuit 14) built-in thermal shutdown protection circuit 15) high-power hrp7 package mounted (bd9006hfp,bd9007hfp,bd9009hfp) 16) compact sop8 package mounted (bd9006f,bd9007f) applications all fields of industrial equipment, such as fl at tv, printer, dvd, car audio, car navigation, and communication such as etc, av, and oa. product lineup item bd9006f/hfp bd9007f/hfp bd9009hfp output current 2a 2a 4a input range 7v 35v 7v 35v 7v 35v oscillation frequency range 50 500khz 50 500khz 50 500khz oscillation frequency accuracy 5% 20% 5% external synchronous function provided provided provided standby function provided provided provided operating temperature -40 +10 5 -40 +10 5 -40 +10 5 package sop8/hrp7 sop8/hrp7 hrp7 no.12027ect35
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 2/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp ? ? ? ?
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 3/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 4/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp ? ?
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 5/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp 0 10 20 30 40 50 60 70 80 90 100 01234 vin=13.2v f=300khz ta=25 ? 5.0v 3.3v 2.5v 1.5v conve rsion e fficie ncy [ % ] output current:io[a] 0 10 20 30 40 50 60 70 80 90 100 01234 vin=13.2v f=100khz ta=25 output current:io[a] fe t on re sistance [] ? 5.0v 3.3v 2.5v 1.5v 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 01234 output current:io[a] fet on resistance[] ? ta=105 ta=25 ta=-40 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 01234 ? ta=105 ta=25 ta=-40 output current:io[a] fe t on re sistance [] 0 1 2 3 4 5 6 7 8 0 5 10 15 20 25 30 35 40 vin[v] circuit currenticc[ma] input voltage :vin[v] 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 01 234 output current:io[a] fet on resistance:ron[] ? ta=105 ta=25 ta=-40
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 6/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp 0 1 2 3 4 5 6 7 01234 vin[v] sw[a] output current :io[a] input voltage :vin[v] 0 1 2 3 4 5 6 7 01234 vin[v] sw[a] input voltage :vin[v] output current :io[a] 0 1 2 3 4 5 6 7 01234 vin[v] sw[a] input voltage :vin[v] output current :io[a] 0 1 2 3 4 5 6 7 8 9 10 0123 45678 output voltage:vo[v] output current:io[a] ?? ta=105 ta=25 ta=-40 0 10 20 30 40 50 60 70 80 90 100 01234 vin=13.2v f=500khz ta=25 ? 5.0v 3.3v 2.5v 1.5v output current:io[a] conversion efficiency [ % ]
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 7/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 8/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp ? ? ? ? ? ? ? ? ??? ???
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 9/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp ? ? sw i l vo fb ^o ? ?? ??` ?? ??` ?? ??` bd9009hfp counter timer t off = 4096/ fosc[s] ) fosc=300khzrt off =13.65ms bd9006f/hfp, bd9007f/ hfp counter timer ? ? t off t off g ?? t off t off ?? ? slope ?Rvo gnd` over current detect level sw i l vo fb internal slope internal soft start output voltage short auto reset (soft start operation) auto reset (soft start operation) auto reset (soft start operation) ex: when fosc=300khz,t off =13.65ms counter timer not operation * off terminal
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 10/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 11/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp ? ? ? ? P ? ? ? ? ? P ? ? ? ? ? ? ? ? P
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 12/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp design method sample calculations 4. selection of diode (d1) set diode rating with an adequate margin to the maximum load current. also, ma ke setting of the rated inverse voltage with an adequate margin to the maximum input voltage. a diode with a low forward voltage and short reverse recovery time will provide high efficiency. when v in (max.)=35v io(max.)=2a diode ratings must include: current over 2a ? ?
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 13/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp point (b) ? ? or less (i.e. the phase margin is 30 ? or more). ? ? ) with a secondary phase lead by inserting two- phase leads, to ensure the stability through the phase compensation. furthermore, the gbw (i.e., frequency at 0-db gain) is determined according to phase compensation capacitan ce provided for the error amplifier. consequently, in order to reduce the gbw, increase the capacitance value. (1) typical integrator (low pass filter) (2) open loop characteristics of integrator since the error amplifier is provided with (1) or (2) phase compens ation, the low pass filter is ap plied. in the case of the dc /dc converter application, the r becomes a parallel resistance of the feedback resistance. a fb c r ?` ? ? ? ? 0 -180 90 0 (a) gbw(b) -90 q a -180 q ?`
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 14/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp fr = [hz] fr = [hz]: resonance f esr = [hz]: phase lead a -90 ? phase-delay occurs. 2 ? ? phase-delay occurs in that area. if esr component is present, however a +90 ? phase-lead occurs to shift the phase delay to -90 ? . since the phase delay should be set within 150 ? , it is a very effective method but tends to in crease the ripple componen t of the output voltage. (1) lc resonant circuit ? ? phase-delay, due to lc resonance, will be compensated. the following section shows a typical phase compensation procedure. (1) phase compensation with secondary phase lead ? phase-delay occurs. 1 2
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 15/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp measurement of open loop of the dc/dc converter to measure the open loop of the dc/dc conver ter, use the gain phase analyzer or fra to measure the frequency characteristics.
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 16/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp fig.41 equivalent circuit ? ? ? ? ? ? ? ? ? ? ? ?
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 17/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp 8. gnd wiring pattern it is recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a single ground at the reference point of the set pcb, so t hat resistance to the wiring pattern and voltage fluctuations due to a large current wi ll cause on fluctuations in voltages of the sma ll-signal gnd. prevent fluctuations in the gnd wiring pattern of external parts. 9. temperature protection (thermal shut down) circuit this ic has a built-in temperature protecti on circuit to prevent the thermal destructi on of the ic. as described above, be sure to use this ic within the power dissipation range. should a cond ition exceeding the power dissipation range continue, the chip temperature tj will rise to activate the temperature protection circuit, thus turning off the output power element. then, when the tip temperature tj falls, the circuit will be automatically rese t. furthermore, if the temperature protection circuit is activa ted under the condition exceeding the absolute maximum ratings, do not attempt to use the temper ature protection circuit for set design. 10. on the application shown below, if there is a mode in which v in and each pin potential are inve rted, for example, if the v in is short- circuited to the ground with external diode charged, internal ci rcuits may be damaged. to avoid damage, it is recommended to insert a backflow prevention diode in the series with v in or a bypass diode between each pin and v in . fig.43 11. this ic is designed that over current protection circuit operates at start up and normal operation. t herefore at start up w hen this ic?s total load current (sum of load curre nt and charge current to output capacitor) is exceeded 2a(bd9006f/hfp,bd9007f/hfp minimum load current ability
technical note 2012.03 - rev.c ? 2012 rohm co., ltd. all rights reserved. www.rohm.com 18/18 bd9006f/hfp, bd9007f/hfp, bd9009hfp
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