AZ7500B
AZ7500B is Pulse-Width-Modulation Controller manufactured by BCD Semiconductor.
Data Sheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS General Description
The AZ7500B/C is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control. The AZ7500B/C consists of a reference voltage circuit, two error amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC) parator, 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 AZ7500B/C provides for pushpull or single-ended output operation, which can be selected through the output control. The difference between AZ7500B and AZ7500C is that they have 4.95V and 5V reference voltage respectively. The AZ7500B/C is available in standard packages of DIP-16 and SOIC-16.
AZ7500B/C
Features
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- - Stable 4.95V/5V Reference Voltage Trimmed to ±1.0% Accuracy Unmitted Output TR for 200m A Sink or Source Current Single-End or Push-Pull Operation Selected by Output Control Internal Circuitry Prohibits Double Pulse at Either Output plete PWM Control Circuit with Variable Duty Cycle On-Chip Oscillator With Master or Slave Operation
Applications
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- SMPS Back Light Inverter Charger
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SOIC-16
DIP-16
Figure 1. Package Types of AZ7500B/C
Apr. 2006 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
Data Sheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS Pin Configuration
M/P Package (SOIC-16/DIP-16)
1IN + 1IN FEEDBACK DTC CT RT GND C1 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 2IN + 2IN REF OUTPUT CTRL VCC C2 E2 E1
AZ7500B/C
Figure 2. Pin Configuration of AZ7500B/C (Top View)
Output Function Control Table
Signal for Output Control VI = GND VI = VREF Output Function Single-ended or parallel output Normal push-pull operation
Functional Block Diagram
OUTPUT CTRL RT CT 6 5 13 Oscillator Dead-Time Control parator DTC 4 0.12V Error Amplifier 1 1IN + 1IN 1 2 12 Error...
