BA9741 ETL | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 5

Technical content

UTC BA9741 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-017,B TWO-CHANNEL SWITCHING REGULATOR CONTORLLER

DESCRIPTION

The UTC BA9741 is a two-channel switching regulator controllers that use the PWM method. It can be used for DC to DC conversion for step-up, step-down, and inverting. The IC comes in a compact package, making it ideal for use in portable equipment.

FEATURES

*High-accuracy reference voltage circuit (±1%). *Time-latch, short-circuit protection circuit. *Miss-operation prevention circuit for low-voltage input *Reference voltage with output (2.5V) *Rest period adjustment is possible over the entire duty *range. APPLICATION *DC/DC converters for video cameras and notebook computers etc. DIP-16 SOP-16 TSSOP-16 PIN CONFIGURATIONS CT RT NON1 INV1 FB1 DT1 OUT1 GND Vcc OUT2 DT2 INV2 SCP VREF NON2 FB2 ERROR AMPLIFIER 1 ERROR AMPLIFIER 2

UTC BA9741 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-017,B PIN DESCRIPTIONS PIN NO. PIN NAME FUNCTOIN

1 CT External timing capacitor

2 RT External timing resistor

3 NON1 Positive input for error amplifier 1

4 INV1 Negative input for error amplifier 1

5 FB1 Error amplifier 1 output

6 DT1 Output 1 dead time/soft start setting

7 OUT1 Output 1

8 GND Ground

9 Vcc Power supply

10 OUT2 Output 2

11 DT2 Output 2 dead time / soft start setting

12 FB2 Error amplifier 2 output

13 INV2 Negative input for error amplifier 2

14 NON2 Positive input for error amplifier 2

15 SCP Time latch setting

16 VREF Reference voltage output (2.5V) BLOCK DIAGRAM Vcc 219 Reference Voltage 6 8 Triangle Oscillator VREF Vref NON 1 INV 1 FB 1 NON 2 INV 2 FB 2 SCP Err Amp 1 Err Amp 2 Vref SRTimer Latch R UVLO SCP Comp Vref Vref DT1 DT2 GND PWM Comp2 PWM Comp1 CT RT OUT1 OUT2

UTC BA9741 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-017,B ABSOLUTE MAXIMUM RATINGS( Ta=25°C ) PARAMETER SYMBOL VALUE UNIT Power Supply Voltage Vcc 36 V Power Dissipation (note 1) SOP-16 DIP-16 Pd 500 650 mW Operating Temperature Topr -40 to 85 °C Storage Temperature Tstg -55 to 125 °C Output Current Io 120(note 2) mA Output Voltage Vo 36 V Note 1: When mounted on 70mm*70mm*1.6mm glass epoxy board. Reduced by 5.0mW,for each increase in Ta of 1°C over 25°C Note 2: Should not exceed Pd and ASO values. RECOMMENDED OPERATING CONDITIONS( Ta=25°C ) PARAMETER SYMBOL MIN TYP. MAX UNIT Power Supply Voltage Vcc 3.6 6.0 35 V Output Current Io 100 mA Output Voltage Vo 35 V Error Amplifier Input Voltage V OM 0.3 1.6 V Timing Capacitor C CT 100 15000 pF Timing Resistor R RT 5.1 50 k Ω Oscillator Frequency F OSC 10 800 kHz ELECTRICAL CHARACTERISTICS( TA=25°C ,VCC=6V,UNLESS OTHERWISE NOTED.) PARAMETER SYMBOL TEST CONIDITIONS MIN TYP. MAX UNIT REFERENCE VOLTAGE BLOCK Output Voltage Vref Iref =1mA 2.4 2.5 2.6 V Input Stability VDLI Vcc =3.6~35V 1 10 mV Load Stability VDLO Iref =0~5mA 1 10 mV TRIANGULAR WAVE OSCILLATOR Oscillation Frequency Fosc R RT=10 kΩ ,CCT=220pF 320 400 480 kHz Frequency Deviation FDV Vcc=3.6~35V 1 % PROTECTION CIRCUIT Threshold Voltage VIT 1.48 1.64 1.80 V Standby Voltage VSTB No pull up 50 100 mV Latch Voltage VLT No pull up 30 100 mV Source Current ISCP 1.5 2.5 3.5 µA Comparator Threshold Voltage VCT 5Pin,12Pin 0.9 1.05 1.2 V REST PERIOD ADJUSTMENT CIRCUIT Vt0 Duty Cycle =0% 1.79 1.97 2.15 V Input Threshold Voltage (fosc=10kHz) Vt100 Duty Cycle =100% 1.32 1.48 1.64 V

UTC BA9741 LINEAR INTEGRATED CIRCUIT UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-017,B PARAMETER SYMBOL TEST CONIDITIONS MIN TYP. MAX UNIT On Duty Cycle DON Divide Vref using 13 k Ω and27 kΩ 45 55 65 % Input Bias Current IBDT DT1,DT2=2.0V 0.1 1 µA Latch Mode Source Current IDT DT1,DT2=0V 200 560 µA Latch Input Voltage VDT IDT=40µA 2.28 2.48 V LOW-VOLTAGE INPUT MISS-OPERATION PREVENTION CIRCUIT Threshold Voltage VUT 2.53 V ERROR AMPLIFIER Input Offset Voltage VIO 6 mV Input Offset Current IIO 30 nA Input Bias Current IIB 15 100 nA Open Circuit Gain AV 70 85 dB Common-mode Input Voltage range VOM Vcc=3.6~35V 0.3 1.6 V Common-mode Rejection Ratio CMRR 60 80 dB Maximum Output Voltage VOH 2.3 2.5 V Minimum Input Voltage VOL 0.7 0.9 V Output Sink Current IOI FB=1.25V 3 20 mA Output Source Current IOO FB=1.25V 45 75 µA PWM COMPARATOR Vt0 Duty Cycle =0% 1.79 1.97 2.15 V Input Threshold Voltage (fosc=10kHz) Vt100 Duty Cycle =100% 1.32 1.48 1.64 V OUTPUT BLOCK Saturation Voltage VSAT Io=75mA 0.8 1.2 V Leak Current IREAK Vo=35V 0 5 µA TOTAL DEVICE Standby Current Iccs When output is off 1.3 1.8 mA Average Current Consumption IccA R RT=10 kΩ 1.6 2.3 mA TIMING CHART 1.97V 1.05V 1.48V 1.64V 2.53V tDT >=Vcc 3.6V Triangular wave output(from oscillator) Error amplifier output Dead-time input voltage Short protection comparator PWM comparator output Output waveform SCP waveform Short protection comparator output Power supply voltage Lockout release Figure. 1