FA494AF

FA494AP FS | Alldatasheet

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Technical content

BIPOLAR LINEAR INTEGRATED CIRCUIT Voltage-Mode PWM Controller IC The FA494AP/AF incorporates on a single monolithic chip all the functions required in the construction of a pulse-width- modulation control circuit. Designed primarily for power supply control, this device offers the systems engineer the flexibility to tailor the power supply control circuitry to a specific application. The FA494AP/AF contains two error amplifiers, an on-chip adjustable oscillator, a dead-tme control(DTC) comparator, a pulse-steering control flip-flop, a 5-V, 5%-precision requlator, and output-control circuits. The error amplifiers exhibit a common-mode voltage range from -0.3V to V CC -2V. The dead-time control comparator has a fixed offset that provides approximately 5% dead time. The on-chip oscillator may be bypassed by terminating RT to the reference output and providing a sawtooth input to CT, or it may drive the common circuits in synchronous multiple-rail power supplies. The uncommitted output transistors provide either common- emitter or emitter-follower output capability. The FA494AP/AF provides for push- pull or single-ended output operation, which may be selected through the output-control function. The architecture of this device prohibits the possibility of either output being pulsed twice during push-pull operation.

FEATURES

Completed PWM Power Control Circuitry. Uncommitted Outputs for 200mA Sink or Source Current. Output Control Selects Single-Ended or Push-Pull Operation. Internal Circuitry Prohibits Double Pulse at Either Output. Variable Dead Time Provides Control Over Total Range. Internal Regulator Provides a Stable 5V Reference Supply With 5% Tolerance. Circuit Architecture Allows Easy Synchronization. 1 8 Θ DIP-16 A B d PD HL W T G DIM MILLIMETERS A B D T P d G H L 3 8 0 3 0 - 15 1 52 0 1 W 19 3 0 2 6 45 0 2 0 46 0 1 0 50 MIN 3 3 0 3 2 54 0 25+0 1/-0 05 7 62 Θ MAXIMUM RATINGS (Ta=25 SOP-16 L 1 8 916 PD H A G T 0 20+0 1/-0 05 P T 1 27 MILLIMETERS 0 4 0 1 0 15+0 1/-0 05 9 88 0 2 G H L D A DIM 6 00 0 3 1 63 0 2 0 65 0 2 3 94 0 2 ITEM SYMBOL RATING UNIT Supply Voltage VCC 41 V Error Amplifier Input Voltage VIN VCC+0.3 V Collector Output Voltage VO 41 V Collector Output Current IO 250 mA Power Consumption FAC494AP PD 750 mW FAC494AF 400 Operating Temperature Topr -20 Storage Temperature Tstg -25 125 INPUT TO OUTPUT CTRL OUTPUT FUNCTION VI=GND Single-ended or paralled output VI=Vref Normal push-pull operation FUNCTION TABLE 2008. 8. 11 1/6Revision No : 0

ELECTRICAL CHARACTERISTICS

ITEM SYMBOL MIN. TYP. MAX. UNIT Supply Voltage VCC 7 - 40 V Ampified Input Voltage VIN -0.3 - VCC-2.0 V Collector Output Voltage VO - - 40 V Output Current (per one stage of output unit) IO - - 200 mA Current Into Feedback Terminal Ifb - - 0.3 mA Timing Capacitor CT 0.47 - 10,000 nF Timing Resister RT 1.8 - 500 k Oscillation Frequency fosc 1 - 300 kHz Operating Temperature Topr -20 - 85 OSCILLATION UNIT RECOMMENDED OPREATING CONDITIONS PAUSE PERIOD ADJUSTING UNIT CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Input Bias Current IIND 0 VIN 5.25V PIN 4 - -2 -10 A Max. Duty (Each Output Stage) Dy MAX. VIN=0, CT=0.1 F, RT=12k - 45 - % Input Threshold Voltage 1 VTH-1 Output pulse 0% duty - 3.0 3.3 V Input Threshold Voltage 2 VTH-2 Output pulse max. duty 0 - - CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Output Voltage Vref Iref=1mA, Ta=25 4.75 5.00 5.25 V Input Stability Reg IN 7V VCC 40V, Iref=1mA, Ta=25 - 2 25 mV Load Stability Reg L 1mA Iref 10mA, Ta=25 - 3 15 Output Voltage Temp. Change TC Vref -20 Ta , Iref=1mA - 0.2 1 %/ Output Short-Circuit Current IS Vref=0 - 35 - mA CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Oscillation Frequency Set Value fOSC CT = 0.001 F, RT =30k - 40 - kHz Oscillation Frequency Setting Accuracy fDIV - 3 - %Frequency Input Stability fVIN 7V VCC 40V, Ta=25 - 0.1 - Frequency Temp. Change fTa -20 Ta - - 12 2008. 8. 11 2/6Revision No : 0 FA494AP/AF

CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Collector off-state Current IC(off) VCE=40V, VCC=40V, Emitter grounded - - 100 A Emitter off-state Current IE(OFF) VCC=VC=40V, VE=0V Emitter follower - - -100 Emitter Saturation Voltage (Emitter grounded) VSAT(C) IC=200mA, VE=0V - 1.1 1.3 V Collector Saturation Voltage (Emitter follower) VSAT(E) IE=-200mA, VC=15V - 1.5 2.5 Output Voltage Rise Time (Emitter grounded) tr1 - 100 200 ns Output Voltage Fall Time (Emitter follower) tf1 - 25 100 Output Voltage Rise Time (Emitter follower) tr2 - 100 200 Output Voltage Fall Time (Emitter grounded) tf2 - 40 100 Output Control Input Operating Current L State IOCL VOC 0.4V - 10 - A H State IOCH VOC=Vref - 0.2 3.5 mA CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Standby Current ICC(S B) VCC=15V, Other terminal opened - 6 10 mA Average Supply Current ICC total V(PIN4)=2V, CT=0.01 F RT=12k , VCC=15V - 7.5 - CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Input Offset Voltage VIO VO PIN 3=2.5V - 2 10 mV Input Offset Current IIO VO PIN 3=2.5V - 5.0 250 nA Input Bias Current IIB VO PIN 3=2.5V - 0.1 1 A In-phase Input Voltage Range CMRIN 7V VCC 40V 0.3 - VCC-2 V Open Load Gain GV VO PIN 3=0.5 3.5V, RL=2k 70 95 - dB Unity Gain Frequency fO VO PIN 3=0.5 3.5V, RL=2k - 800 - kHz Common-mode rejection Ratio CMRR VCC=40V 65 90 - dB Output Sink Current (Feedback) IO+ VO PIN 3=0.7V 0.3 0.7 - mA Output Source Current (Feedback) IO+ VO PIN 3=3.5V -2 -4.0 - CHARACTERISTIC SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Input Threshold Voltage (Feedback) VTH Zero duty cycle - 4 4.5 V Input Sink Current (Feedback) II VO PIN 3=0.7V 0.3 0.7 - mA ERROR AMPLIFIER PWM COMPARATOR OUTPUT UNIT CURRENT CONSUMPTION (TOTAL) 2008. 8. 11 3/6Revision No : 0 FA494AP/AF

V LOW SUPPLY VOLTAGE PROTECTIVE REFERENCE VOLTAGE GND R NON-INV INPUT DEAD TIME CONTROL T TC TR CT CC Vref INV INPUT FEED BACK INV-INPUT NON-INV INPUT (Note) PIN BECOMES SINGLE MODE AT "L" AND PUSH-PULL MODE AT "H" + P W M CT TERMINAL VOLTAGE 3-PIN TERMINAL VOLTAGE DEAD TIME CONTROL INPUT FLIP-FLOP CLOCK INPUT FLIP-FLOP Q FLIP-FLOP Q OUTPUT Q1 EMITTER OUTPUT Q2 EMITTER OUTPUT CONTROL INPUT Q Q BLOCK DIAGRAM OPERATING WAVEFORM 2008. 8. 11 4/6Revision No : 0 FA494AP/AF

Error Amplifier Characteristics TEST CIRCUIT Amplifier Under Test FEEDBACK OTHER Amplifier VI refV VCC CCV =15V OUTPUT 1 OUTPUT 2 DTC FEEDBACK RT CT 1IN+ 1IN- ERROR 2IN+ 2IN- OUTPUT CONTROL efR GND TEST INPUTS 150Ω 2W 150Ω 2W 50kΩ Each Output Circuit 15V 68Ω 2W 90% 90% ftt r 10% 90% 10% 90% 68Ω 2W 15V Circuit Each Output LC =15pF LC =15pF 12KΩ 0 01µF Amplifiers Output TEST CIRCUIT NOTE A C includes probe and jig capacitanceL Common-Emitter Configuration Test Circuit and Waveform 10% 10% ft rt OUTPUT VOLTAGE WAVEFORM Emitter-Follower Configuration Test Circuit and Waveform NOTE A C includes probe and jig capacitance TEST CIRCUIT OUTPUT VOLTAGE WAVEFORM L Output 2008. 8. 11 5/6Revision No : 0 FA494AP/AF

OSCOSCILLATOR FREQUENCY t (Hz) FREQUENCY f (Hz) k 0 1k 0 . 1 0 0 1 0 1 1.0 T 1.0k TIMING RESISTANCE R (Ω) 300 100k 1.0k 500 5.0k 20k 50k 200k 500k 1.0M C =0 001uFT CCV =15V 0 01uF 0 1uF 180 160 140 Φ EXCESS PHASE (DEGREES) OPEN-LOOP VOLTAGE GAIN A (dB)VOL 120 110 100 100k 1.0M 120 100 V =15VCC OV =3 0V R =2 0kL AVOL Φ CE(sat)SATURATION VOLTAGE V (V)0.4 300200100 COLLECTOR CURRENT I (mA) C 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 EMITTER CURRENT I (mA) 100 200 E SUPPLY CURRENT I (mA)CC 0 . 5 0 1 5 1 0 2 5 2 0 3 SUPPLY VOLTAGE V (V) CC 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 35 40 SATURATION VOLTAGE V (V)CE(sat) V - ICE ECCE(sat)V - I VOLA , PHASE - fTOSCt - R I - VCC CC 2008. 8. 11 6/6Revision No : 0 FA494AP/AF