DatasheetsPDF.com

BD9306AFVM Dataheets PDF



Part Number BD9306AFVM
Manufacturers Rohm
Logo Rohm
Description Boost Controller
Datasheet BD9306AFVM DatasheetBD9306AFVM Datasheet (PDF)

Datasheet 4.2V to 18V Input 1ch Boost Controller BD9306AFVM General Description BD9306AFVM is a 1-channel DC/DC converter controller. A Step-up DC/DC converter can be configured. In addition, it has a built-in master-slave function which improves synchronization. Features  1ch PWM Controlled DC/DC Converter Controller  Built-in Soft Start Function  Built-in Master / Slave Function  Protection Circuits:  Under Voltage Lockout Protection Circuit  Thermal Shutdown Circuit  Short Protection .

  BD9306AFVM   BD9306AFVM


Document
Datasheet 4.2V to 18V Input 1ch Boost Controller BD9306AFVM General Description BD9306AFVM is a 1-channel DC/DC converter controller. A Step-up DC/DC converter can be configured. In addition, it has a built-in master-slave function which improves synchronization. Features  1ch PWM Controlled DC/DC Converter Controller  Built-in Soft Start Function  Built-in Master / Slave Function  Protection Circuits:  Under Voltage Lockout Protection Circuit  Thermal Shutdown Circuit  Short Protection Circuit of Timer Latch type Key Specifications  Power Supply Voltage Range: 4.2V to 18V  Error Amplifier Feed Back Voltage: 1.25±1.6%  Oscillating Frequency Range: 100kHz to 800kHz  Standby Current: 0µA(Typ)  Operating Temperature Range: -40°C to +85°C Package W(Typ) x D(Typ) x H(Max) Applications ・TV, Power Supply for the TFT-LCD Panels used for LCD TVs, Back Lights ・DSC, DVC, Printer, DVD ,DVD Recorder, Generally Consumer Equipments etc. MSOP8 2.90mm x 4.00mm x 0.90mm Typical Application Circuit FB 8 1.25V Err OSC 1 RT 20Ω 10000pF 3.9kΩ COMP 7 GND 6 VCccC 5 Soft Start Timer 0 Latch - Shut Down Vref UV-LO TSD Vcc Shut Down VCC 10uF 47uH V Io=30mA PWM DRV ENABLE 2 CT 200pF 3 ENB 10kΩ 4 GD VVCCCC Figure 1. Typical Application Circuit 20uF 200kΩ 15kΩ VVoOUT 1kΩ 100pF ○Product structure:Silicon monolithic integrated circuit www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product has no designed protection against radioactive rays 1/20 TSZ02201-0323AAJ00640-1-2 13.Nov.2015 Rev.001 BD9306AFVM Pin Configuration TOP VIEW Pin Descriptions Pin No 1 2 3 4 5 6 7 8 Block Diagram Pin Name RT CT ENB GD VCC GND COMP FB Function External timing resistor pin External timing capacitor pin Control pin Gate drive output pin Power supply pin Ground pin Error amp output pin Error amp inversion input pin FB 8 1.25V Err COMP 7 GND 6 VCVCcc 5 Soft Start Timer 0 Latch - Shut Down Vref UV-LO TSD Vcc Shut Down V Io=30mA OSC 1 RT PWM DRV 2 CT ENABLE 3 ENB 4 GD www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/20 TSZ02201-0323AAJ00640-1-2 13.Nov.2015 Rev.001 BD9306AFVM Block Operation 1. Error Amplifier (Err) It compares a reference voltage of 1.25V (TYP) and the output feedback voltage. This block produces the COMP terminal voltage that determines the duty cycle. 2. Oscillator (OSC) This block determines the switching frequency by RT and CT values. The triangular wave is determined by RT and CT. 3. PWM The duty cycle is determined by comparing the output of Error amplifier and the angular wave of Oscillator. The switching Duty of BD9306AFVM is limited by the maximum duty ratio that is determined by the internal part, and will not be up to 100%. 4. DRV This block drives the gate of the external power FET by the PWM switching Duty. 5. VREF This block outputs the internal reference voltage of 2.5V (TYP). This circuit’s reference voltage is controlled (ON / OFF) by the ENB terminal. 6. Protection Circuits (UVLO / TSD) UVLO (low-voltage Lock Out circuit) shuts down the circuits when the voltage is below 3.5V (MIN). TSD (temperature protection circuit) shuts down the IC when the temperature reaches 175°C (TYP). 7. Soft Start Circuit The Soft Start Circuit limits the current when the output voltage is slowly increasing during start-up. Through this, the overshoot of output voltage and current sinking can be prevented. 8. Timer Latch It is an output short protection circuit that detects if the output of error amplifier (COMP voltage) is more than 1.7V (TYP). If the COMP voltage becomes more than 1.7V, the counter begins to operate. The LATCH is locked when the counter counts to 2200 and the GD output shuts down. The frequency of counter is determined by RT and CT. Once the LATCH was locked, the GD output will not operate until it is restarted by ENB or VCC. If the output short is removed while the Timer latch is counting, the counter will be reset. www.rohm.com © 2015 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/20 TSZ02201-0323AAJ00640-1-2 13.Nov.2015 Rev.001 BD9306AFVM Absolute Maximum Ratings (Ta = 25°C) Parameter Symbol Limit Unit Power Supply Voltage (Note 2) Power Dissipation VCC Pd 20 0.58 (Note 1) V W Operating Temperature Range Topr -40 to +85 °C Storage Temperature Range Tstg -55 to +150 °C Maximum Junction Temperature Tjmax 150 °C (Note 1) When mounted on a glass epoxy 4-layer board (70 mm x 70 mm x 1.6 mm). Derate by 4.7 mW/°C for Ta over 25°C. (Note 2) Must not exceed Pd. Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. .


BD9305AFVM BD9306AFVM NT2GC72B89B0NJ


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)