Product Brief PULSE-WIDTH-MODULATION CONTROL CIRCUITS Description The AZ494A/C is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control. The AZ494A/C consists of a reference voltage circuit, two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) comparator, a pulse-steering control flip-flop, and an output control circuit. The precision of voltage reference (VREF) is improved up to ± 1% through trimming and this provides a better output voltage regulation. The AZ494A/C provides for push-pull or single-ended output operation, which can be selected through the output control. Features · · · · · · Stable 4.95V/5V Reference Voltage Trimmed to ±1.0% Accuracy Uncommitted Output TR for 200mA Sink or Source Current Single-End or Push-Pull Operation Selected by Output Control Internal Circuitry Prohibits Double Pulse at Either Output Complete PWM Control Circuit with Variable Duty Cycle On-Chip Oscillator With Master or Slave Operation AZ494A/C Parametric Table AZ494A 4.95 AZ494C 5 Reference Voltage (V) Reference Voltage Tolerance 1% Frequency Change with Temperature (Max) 1% Open Loop Voltage Gain (db) 95 Unity-Gain Bandwidth (KHz) 650 Output Saturation Voltage (Common Emitter) (V) 1.1 Rise Time (ns) 100 Fall Time (ns) 25 Supply Voltage (V) DIP-16 Package SOIC-16 Benefits · · Higher Power Glitch Rejection Very competitive price Applications Additional Available Materials · · · · · · · · · SMPS Back Light Inverter Charger Apr. 2006 7 to 36 Samples Data Sheet Reliability Report ESD Report Application Notes Demo Board BCD Semiconductor Manufacturing Limited Product Brief PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ494A/C Pin Configuration SOIC-16/DIP-16 1IN + 1 16 2IN + 1IN - 2 15 2IN - FEEDBACK 3 14 REF DTC 4 13 OUTPUT CTRL CT 5 12 VCC RT 6 11 C2 GND 7 10 E2 C1 8 9 E1 Ordering Information Package Temperature Range SOIC-16 -40 to 85oC DIP-16 Part Number Tin Lead Marking ID Lead Free Tin Lead Lead Free Packing Type AZ494AM AZ494AM-E1 AZ494AM AZ494AM-E1 Tube AZ494AMTR AZ494AMTR-E1 AZ494AM AZ494AM-E1 Tape & Reel AZ494CM AZ494CM-E1 AZ494CM AZ494CM-E1 Tube AZ494CMTR AZ494CMTR-E1 AZ494CM AZ494CM-E1 Tape & Reel AZ494AP AZ494AP-E1 AZ494AP AZ494AP-E1 Tube AZ494CP AZ494CP-E1 AZ494CP AZ494CP-E1 Tube Detailed information please refer to the relevant datasheet. USA 3170 De La Cruz Blvd, Suite # 105 Santa Clara, CA 95054-2411, U.S.A Tel : +1-408-988 6388 Fax : +1-408-988 6386 Shanghai 8F, B Zone, 900 Yi Shan Road, Shanghai 200233, China Tel : 86-21-6495 9539 Fax : 86-21-6485 9673 Taiwan 4F, 298-1 Rui Guang Road, Nei-Hu District, Taipei, Taiwan Tel : 886-2-2656-2808 Fax : 886-2-2656-2806 Shenzhen Room 27B, Tower C, No. 2070, Shennanzhong Road, Shenzhen 518031, China Tel : 86-755-8368 3987 Fax : 86-755-8368 3166 Apr. 2006 BCD Semiconductor Manufacturing Limited