Data Sheet
PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ7500C
General Description Features
The AZ7500C 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 AZ7500C 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 AZ7500C 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 difference between AZ7500B and AZ7500C is that
they have 4.95V and 5V reference voltage respectively.
SMPS
The AZ7500C is available in standard package of
Back Light Inverter
SOIC-16.
Charger
SOIC-16
Figure 1. Package Type of AZ7500C
BCD Semiconductor Manufacturing Limited
May 2010 Rev. 1. 8
1 Data Sheet
PULSE-WIDTH-MODULATION CONTROL CIRCUITS AZ7500C
Pin Configuration
M Package
(SOIC-16)
1IN + 2IN +
16
1
1IN - 2IN -
2 15
FEEDBACK 3 14 REF
DTC 13 OUTPUT CTRL
4
12
CT 5 V
CC
RT C2
6 11
GND 10 E2
7
9 E1
C1 8
Figure 2. Pin Configuration of AZ7500C (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 AZ7500C
BCD Semiconductor Manufacturing Limited
May 2010 Rev. 1. 8
2