BM1C001F-GE2

Datasheet AC/DC Drivers Power Factor Correction and Quasi-Resonant DC/DC converter IC BM1C001F  PFC Output level setting function  PFC ON/OFF level setting  QR low power when load is light (Burst operation) and frequency decrease function  QR maximum frequency control (120kHz)  QR_CS pin open protection and OCP function  QR Over-Current Protection with AC compensation  QR Soft Start function  QR secondary side protection circuit of over-current  QR_ZT pin 2 step timeout function and OVP function General Description The compounded LSI of the Power Factor Correction (PFC) converter and Quasi-Resonant (QR) controller type AC/DC converter IC provides an optimum system for all products that include an electrical outlet. BM1C001F has a built in HV starter circuit that tolerates 650V and contributes to low power consumption and high speed start. The PFC part is a Boundary Conduction Mode (BCM). It reduces the switching loss and the switching noise. This IC has adopted the voltage control mode, a solution that achieves no auxiliary winding and reduces external parts and the bias current. The DC/DC part is Quasi-Resonant controlled. This control enables soft switching and helps to keep the EMI low. With MOSFET for switching and current detection resistors as external devices, a higher degree of design freedom is achieved. This IC has over voltage protection for the PFC’s output terminal, which protects electrolytic capacitors by stopping switching and makes the standby power consumption low by the PFC ON/OFF control function. The IC includes various protective functions such as VCC over voltage protection, external latch protection, brown out protection, soft start function, per-cycle current limiter and over load protection. Features          Applications AC adapters and Household appliances (Printer, TV, Vacuum cleaners, Air cleaners, Air conditioners, IH cooking heaters, Rice cookers, etc.). Key Specifications Operating Power Supply: Voltage Range: Operating Current: VCC VH_IN Normal Burst PFC QR Max frequency: 8.9V to 26.0V 80V to 600V 1.2mA (Typ) 0.6mA (Typ) 400kHz (Max) 120kHz (Typ) -40°C to +85°C The range of temperature: Package W(Typ) x D(Typ) x H(Max) PFC+QR Combo IC Built-in 650V tolerance start circuit VCC pin: under and over voltage protection Brown out function External latch terminal function PFC boundary current mode (voltage control) PFC Zero Cross Detection PFC variable max frequency (up to 400kHz) PFC Dynamic & Static OVP function SOP18 11.20mm × 7.80mm × 2.01mm pitch 1.27mm SOP18 Typical Application Circuit 15.0V 5.0A FUSE AC Filter 85-265 Vac Diode Bridge P_VS VCC QR_ZT P_IS SBD QR_OUT P_IS QR_OUT 18 VH_IN 17 16 15 14 (N.C.) P_TIMER QR_OUT P_OUT QR_CS P_VS 13 12 11 10 P_IS QR_CS P_VS P_OVP Csw QR_CS ERROR AMP RS QR_FB BM1C001F PC VCC GND QR_FB QR_ZT COMP P_EO BR 1 2 3 4 5 6 7 QR_FB QR_ZT P_RT P_OFFSET BR VCC BR 8 9 PC CPU Figure 1. Application circuit ○Product structure：Silicon monolithic integrated circuit .www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product has no designed protection against radioactive rays 1/32 TSZ02201-0F1F0A200010-1-2 07.Mar.2014 Rev.003 Datasheet BM1C001F Pin Configuration Figure 2. Pin Layout (Top View) Pin Description Table 1. I/O Pin Functions Pin Name I/O Pin No. VCC GND QR_FB QR_ZT COMP P_EO BR P_RT P_OFFSET P_OVP P_VS QR_CS P_IS P_OUT QR_OUT P_TIMER N.C. VH_IN I/O I/O I I I O I I I I I I I O O I I 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Function [General] Power supply pin [General] GND pin [ QR ] Feedback detection pin [ QR ] Zero cross detection pin [General] External latch input pin [PFC] Error amplifier output pin [General] Input AC voltage monitor pin [PFC] Max frequency setting pin [PFC] ON/OFF setting voltage [PFC] Over voltage detection pin [PFC] Feedback signal input pin [ QR ] Over-current detection pin [PFC] Zero cross detection pin [PFC] External MOS drive pin [ QR ] External MOS drive pin [PFC] OFF time setting pin [General] Starter circuit pin 2/32 ESD Diode VCC GND ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ - TSZ02201-0F1F0A200010-1-2 07.Mar.2014 Rev.003 Datasheet BM1C001F Block Diagram Figure 3. Block Diagram www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/32 TSZ02201-0F1F0A200010-1-2 07.Mar.2014 Rev.003 Datasheet BM1C001F Description of Blocks (1) Starter Block (VH_IN Pin) The built-in starter circuit tolerates 650V and enables low standby mode current consumption and high speed starting. After starting, current consumption is idle ISTART3 (typ=10uA). This function is shown in Figure 4 and Figure 5. To supply electric power from AC supply to VHIN, rectification is inputed from both ends of AC waveform to VHIN for stable works (Refer to Figure6). ISTART2 ISTART1 ISTART3 0 Vsc 10V VUVLO1 VCC Voltage [V] Figure 4. Starter Circuit Block Diagram Figure 5. Start-up Current vs VCC Voltage In addition, VH_IN pin has a Cap discharge function. (Refer to Figure 6). If the input voltage of the BR pin goes below 1.0V, discharge starts after waiting 256ms. (However during Light load mode, the OLP state of the secondary side output, if there is no power supply from the auxiliary winding, when the IC is in recharge operation, discharge begins after removing the AC outlet without waiting for the timer (256ms), with the current consumption of the internal circuitry of the IC. (Path: Figure 6 (a))) Figure 6. Starter Circuit Block Diagram www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/32 TSZ02201-0F1F0A200010-1-2 07.Mar.2014 Rev.003 Datasheet BM1C001F (2) Start-Up Sequence (Soft Start Operation, Light Load Operation, Over Load Operation, Auto Recovery Operation) The start up sequence is showed at Figure 7; the DC/DC part operates first, followed by the PFC part. A: Input voltage VH_IN is applied. B: Charge current flows from start circuit to the VCC pin capacitor. Then VCC pin voltage rises. C: Monitor the AC voltage by BR pin. And confirm normal state by releasing brown out (BR pin>1.0V). D: When VUVLO1 (typ.13.5V) < VCC pin, UVLO is released and this IC operates. E: After rising, the internal regulator, DC/DC part, starts operation, and then VOUT voltage rises. When the DC/DC starts, the DC/DC output voltage is set to be the specified voltage to until tFOLP (typ.256ms). [QR Start-Up Operation] F: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 1 against over voltage and current rising. This term continues for tss1 (typ.0.5ms). This IC operates the state until maximum power of QR is 12%. G: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 2 against over voltage and current rising. This term continues for tss2 (typ.1.0ms). This IC operates the state until maximum power of QR is 25%. H: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 3 against over voltage and current rising. This term continues for tss2 (typ.2.0ms). This IC operates the state until maximum power of QR is 50%. I: This IC adjusts the over-current limiter of DC/DC part during the operation of soft start 4 against over voltage and current rising. This term continues for tss2 (typ.4.0ms). This IC operates the state until maximum power of QR is 75%. J: If secondary voltage is value is set, the QR_FB voltage value corresponding to load current from photo coupler is constant. At normal state, QR_FB voltage is QR_FB2.25V, the output voltage rise is slow, Then, P_VS is stable with voltage of 1.625V (ACIN L) or (ACIN H) 2.5V by the input state of the BR pin. VH_IN VUVLO1(typ=13.5V) VCC [VCCUVLO] OK BR [BrounOut] OK [QR_OK] OK 250usec 0.5ms 1.0ms 0.5ms DCDC 12% 25% 2.0ms 50% Normal Operation 75% Output Setting Voltage VO(QR) VFOLP(typ=2.6V) QR_FB OK PFC_OK Output Setting Voltage VO(PFC) VSAMP (typ=2.50V) P_VS=2.25V P_VS VP_SHORT typ=0.30V AB C D E F G H I J K L M Figure 7. Start-up Sequence Timing Chart www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/32 TSZ02201-0F1F0A200010-1-2 07.Mar.2014 Rev.003 Datasheet BM1C001F (3) VCC Pin Protection Function BM1C001F includes built-in VCC low voltage protection function, VCC UVLO (Under Voltage Lock Out), VCC over voltage protection function, VCC OVP (Over Voltage Protection), and VCC CHARGE function that operates in case the VCC voltage drops. VCC UVLO and VCC OVP monitor the VCC pin and prevent the VCC pin from destroying the switching MOSFET with abnormal voltage. VCC charge function stabilizes the secondary output voltage by charging it from the high voltage line using the starter circuit when the VCC voltage drops. (3-1) VCC UVLO／VCC OVP Function VCC UVLO is an auto recovery comparator that has voltage hysteresis. VCC OVP is also an auto recovery comparator that has voltage hysteresis. VCC OVP operates detection in case of continuing VCC pin voltage > VOVP (typ.27.5V). This function has built-in mask time of tLATCH(typ.150us). By this function, this IC masks pin generated surge etc. (3-2) VCC Charge Function VCC charge function operates once the VCC pin >VUVLO1 and the DC/DC operation starts and then when the VCC pin voltage drops to VCHG2, charging is stopped, and start PFC works. The operations are shown in figure 8. Figure 8. VCC UVLO / VCC OVP / VCC Charge Function Timing Chart A: VH _IN pin voltage rises, VCC pin voltage starts rising. B: VCC > VUVLO1, VCC UVLO is released, DC/DC operation starts. C: VCC > VOVP, VCC OVP detects the overvoltage in the IC. D: If the state of VCC < VOVP continued tLATCH (typ.100us) time, switching will stop by the OVP function. (Latch mode). E: VCC < VCHG1, VCC terminal voltage rises by VCC recharging function. F: VCC > VCHG2, VCC recharge function stops. G: (The same with E.) H: (The same with F.) I: Voltage of the high voltage line VH is reduced J: VCC