UTC BA9741A LINEAR INTEGRATED CIRCUIT TWO-CHANNEL SWITCHING REGULATOR CONTORLLER DESCRIPTION The UTC BA9741A 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. SOP-16 FEATURES TSSOP-16 *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. DIP-16 APPLICATION *DC/DC converters for video cameras and notebook computers etc. PIN CONFIGURATIONS CT 1 16 VREF RT 2 15 SCP NON1 3 ERROR AMPLIFIER 1 INV1 4 14 NON2 13 INV2 FB1 5 12 FB2 DT1 6 11 DT2 OUT1 7 10 OUT2 GND 8 9 UTC ERROR AMPLIFIER 2 Vcc UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT PIN DESCRIPTIONS PIN NO. PIN NAME 1 CT FUNCTOIN External timing capacitor External timing resistor 2 RT 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 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 16 VREF Output 2 Time latch setting Reference voltage output (2.5V) BLOCK DIAGRAM Vcc 9 VREF 16 Vref RT 2 CT 1 Reference Voltage Triangle Oscillator 7 OUT1 NON 1 3 + INV 1 4 - FB 1 5 NON 2 14 + INV 2 13 - FB 2 12 + + - Err Amp 1 + + SCP Comp PWM Comp1 10 OUT2 Err Amp 2 + + Vref PWM Comp2 Vref Vref SCP 15 S Timer Latch R R UVLO 6 11 DT1 DT2 UTC 8 GND UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT ABSOLUTE MAXIMUM RATINGS( Ta=25°C ) SYMBOL VALUE UNIT Power Supply Voltage PARAMETER Vcc 36 V Power Dissipation (note 1) SOP-16 DIP-16 Pd 500 mW 650 Operating Temperature Topr Storage Temperature °C -40 to 85 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 Power Supply Voltage Output Current SYMBOL MIN TYP. MAX UNIT Vcc 3.6 6.0 35 100 V mA 35 V 1.6 15000 50 800 V pF kΩ kHz Io Output Voltage Vo Error Amplifier Input Voltage Timing Capacitor Timing Resistor Oscillator Frequency VOM CCT RRT FOSC 0.3 100 5.1 10 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 2.5 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 RRT=10 kΩ ,CCT=220pF 400 480 kHz Frequency Deviation FDV Vcc=3.6~35V PROTECTION CIRCUIT Threshold Voltage Standby Voltage VIT No pull up Latch Voltage VLT No pull up Source Current ISCP Comparator Threshold Voltage VCT UTC 320 1 1.48 VSTB REST PERIOD ADJUSTMENT CIRCUIT Input Threshold Voltage Vt0 (fosc=10kHz) Vt100 2.4 % 1.64 1.80 V 50 100 mV 30 100 mV 1.5 2.5 3.5 µA 5Pin,12Pin 0.9 1.05 1.2 V Duty Cycle =0% 1.79 1.97 2.15 V Duty Cycle =100% 1.32 1.48 1.64 V UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL TEST CONIDITIONS MIN DON Divide Vref using 13 kΩ and27 kΩ 45 IBDT DT1,DT2=2.0V TYP. MAX UNIT On Duty Cycle Input Bias Current Latch Mode Source Current IDT DT1,DT2=0V 200 560 µA VDT IDT=40µA 2.28 2.48 V 2.53 V Latch Input Voltage LOW-VOLTAGE INPUT MISS-OPERATION PREVENTION CIRCUIT Threshold Voltage VUT 55 65 % 0.1 1 µA ERROR AMPLIFIER Input Offset Voltage VIO 6 Input Offset Current IIO 30 nA Input Bias Current IIB 100 nA Open Circuit Gain 15 AV Common-mode Input Voltage range Common-mode Rejection Ratio VOM 70 Vcc=3.6~35V 85 mV dB 0.3 1.6 80 V CMRR 60 dB Maximum Output Voltage VOH 2.3 Minimum Input Voltage VOL Output Sink Current IOI FB=1.25V 3 20 mA Output Source Current IOO FB=1.25V 45 75 µA PWM COMPARATOR Input Threshold Voltage (fosc=10kHz) Vt0 Duty Cycle =0% 1.79 1.97 2.15 V 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 RRT=10 kΩ 1.6 2.3 mA 2.5 V 0.7 0.9 V TIMING CHART Triangular wave output(from oscillator) Error amplifier output Dead-time input voltage 1.97V 1.05V Short protection comparator 1.48V PWM comparator output Output waveform 1.64V SCP waveform tDT Short protection comparator output 2.53V Vcc > = 3.6V Lockout release Power supply voltage Figure. 1 UTC UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R103-019,A UTC BA9741A LINEAR INTEGRATED CIRCUIT 1.0 0.5 0 -0.5 -1.0 2.2 V CC =6V RT1=10KΩ 2.0 Upper Voltage 1.8 1.6 Lower Voltage 1.4 -1.5 -20 0 20 40 60 80 Ambient Temperature : Ta (℃) 1.0 100K Oscillator Frequency :fosc (Hz) 1M Figure 5. Error Amplifier AC Gain Characteristic (40dB close) 50 Av 180 40 30 Gain :Av (dB) 0.8 0.6 0.4 20 10 0 90 θ 0 -10 -90 -20 -30 0.2 0 0 1.2 10K 100 Phase :θ(deg) -2.0 -40 Figure4. Output Current vs.Output Saturation Voltage 1.2 Output Saturation Voltage: Vosat (V) Figure 3. Swing Voltage vs. Frequency Figure 2. Reference Voltage vs.Ambient Temperature 2.0 VCC =6V 1.5 Iref = -1mA Swing Voltage :Vosc(V) Reference Voltage Variation:△Vref (%) ELECTRICAL CHARACTERISTIC CURVES 20 UTC 40 60 80 100 120 140 Output Current :Io (mA) -40 -50 100 -180 1K 10K 100K 1M Frequency :f (Hz) UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R103-019,A