AZ7500FMTR-G1 Diodes Incorporated

Preliminary Datasheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ7500F General Description Features The AZ7500F is a voltage mode pulse width modula- Stable 5V Reference Voltage Trimmed to 1.0% tion switching regulator control circuit designed pri- Accuracy marily for power supply control. Uncommitted Output TR for 200mA Sink or Source Current The AZ7500F consists of a reference voltage circuit, Single-End or Push-Pull Operation Selected by two error amplifiers, an on-chip adjustable oscillator, a Output Control dead-time control (DTC) comparator, a pulse-steering Internal Circuitry Prohibits Double Pulse at Either control flip-flop, and an output control circuit. The pre- Output cision of voltage reference (V ) is improved up to REF Complete PWM Control Circuit with Variable 1% through trimming and this provides a better output Duty Cycle voltage regulation. The AZ7500F provides for push- On-Chip Oscillator With Master or Slave Opera- pull or single-ended output operation, which can be tion selected through the output control. Applications The AZ7500F is available in standard packages of DIP- 16 and SOIC-16. SMPS Back Light Inverter Charger DIP-16 SOIC-16 Figure 1. Package Types of AZ7500F Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ7500F Pin Configuration M Package P Package (SOIC-16) (DIP-16) 1IN + 2IN + 1IN + 2IN + 1 16 1 16 1IN - 15 2IN - 1IN - 2 15 2IN - 2 FEEDBACK REF FEEDBACK REF 3 14 3 14 OUTPUT CTRL DTC OUTPUT CTRL DTC 4 13 4 13 CT V CT V 5 12 5 12 CC CC RT 6 11 C2 RT 6 11 C2 10 GND 7 E2 GND 10 E2 7 E1 9 E1 C1 8 C1 9 8 Figure 2. Pin Configuration of AZ7500F (Top View) Output Function Control Table Signal for Output Control Output Function V = GND Single-ended or parallel output I V = V Normal push-pull operation I REF Functional Block Diagram OUTPUT CTRL 6 13 8 RT C1 5 Oscillator Pulse-Steering CT Flip-Flop Q1 Dead-Time Control Comparator 9 E1 D 4 C2 DTC + 11 CK 0.12V Q2 Error Amplifier 1 + 10 PWM E2 1 Comparator 1IN + + 2 1IN - 12 V CC Error Amplifier 2 16 2IN + + Reference 14 REF Regulator 15 2IN - 0.7mA 7 GND 3 FEEDBACK Figure 3. Functional Block Diagram of AZ7500F Oct. 2009 Rev. 1. 2 BCD Semiconductor Manufacturing Limited 2