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Data Sheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS General Description
The AZ7500E is a voltage mode pulse width modulation switching regulator control circuit designed primarily for power supply control. The AZ7500E 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 AZ7500E provides for pushpull or single-ended output operation, which can be selected through the output control. AZ7500E is the enhanced version of AZ7500B for it improves REF Pin's reliability comparing with AZ7500B. The AZ7500E is available in standard packages of DIP-16 and SOIC-16.
AZ7500E
Features
· · · · · · Stable 4.95V 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
Applications
· · · SMPS Back Light Inverter Charger
SOIC-16
DIP-16
Figure 1. Package Types of AZ7500E
Oct. 2008 Rev. 1. 2 1
BCD Semiconductor Manufacturing Limited
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Data Sheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ7500E
Pin Configuration
M Package (SOIC-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
P Package (DIP-16)
2IN + 2IN REF OUTPUT CTRL VCC C2 E2 E1 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
Figure 2. Pin Configuration of AZ7500E (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
8
Q1
C1
Pulse-Steering Flip-Flop
Dead-Time Control Comparator DTC 4
0.12V
9
D CK
E1 C2
+
11
Q2
Error Amplifier 1 1IN + 1IN 1 2
+
+
PWM Comparator
10
E2
12
Error Amplifier 2 2IN + 2IN 16 15
VCC REF GND
+
0.7mA
Reference Regulator
14 7
FEEDBACK
3
Figure 3. Functional Block Diagram of AZ7500E Oct. 2008 Rev. 1. 2 2 BCD Semiconductor Manufacturing Limited
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Data Sheet PULSE-WIDTH-MODULATION CONTROL CIRCUITS Ordering Information AZ7500E
AZ7500
E1: Lead Free G1: Green TR: Tape and Reel Blank: Tube
Circuit Type
Reference Voltage E: 4.95V
Package M: SOIC-16 P: DIP-16
Package
Temperature Range
Part Number Lead Free AZ7500EM-E1 Green AZ7500EM-G1
Marking ID Lead Free AZ7500EM-E1 Green AZ7500EM-G1 AZ7500EM-G1 AZ7500EP-G1
Packing Type Tube Tape & Reel Tube
SOIC-16 DIP-16
-40 to 85 C
o
AZ7500EMTR-E1 AZ7500EP-E1
AZ7500EMTR-G1 AZ7500EM-E1 AZ7500EP-G1 AZ7500EP-E1
BCD Semiconductor's Pb-free products, as design.