Pb
AZ7500B
Lead-Free
BB
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Description Pin Assignments
The AZ7500B is a voltage mode pulse width modulation switching
regulator control circuit designed primarily for power supply control.
(Top View)
The AZ7500B consists of a reference voltage circuit, two error
1IN+
1 16 2IN+
amplifiers, an on-chip adjustable oscillator, a dead-time control (DTC)
comparator, a pulse-steering control flip-flop, and an output control
1IN- 2 15 2IN+
circuit. The precision of voltage reference (V ) is improved up to
REF
1% through trimming and this provides a better output voltage
FEEDBACK REF
3 14
regulation. The AZ7500B provides for push-pull or single-ended
13 OUTPUT CTRL
output operation, which can be selected through the output control. DTC 4
CT 5 12 VCC
The difference between AZ7500B and AZ7500C is that they have
4.95V and 5V reference voltage respectively.
RT 6 11 C2
The AZ7500B is available in standard packages of SO-16. 10
GND 7 E2
C1
9 E1
8
Features
SO-16
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
Applications
Internal Circuitry Prohibits Double Pulse at Either Output
Complete PWM Control Circuit with Variable Duty Cycle
SMPS
On-Chip Oscillator with Master or Slave Operation
Back Light Inverter
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Charger
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See
AZ7500B
BB
Output Function 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
15 Regulator
2IN -
0.7mA
7
GND
3
FEEDBACK
2 of 10
AZ7500B July 2015
Diodes Incorporated
www.diodes.com
Document number: DS38112 Rev. 2 - 2