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AZ7500B
Document number: DS38112 Rev. 2 - 2
1 of 10
www.diodes.com
July 2015
© Diodes Incorporated
AZ7500B
BB
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Description
The AZ7500B is a voltage mode pulse width modulation switching
regulator control circuit designed primarily for power supply control.
The AZ7500B 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 (V
REF
) is improved up to
±1% through trimming and this provides a better output voltage
regulation. The AZ7500B provides for push-pull 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 is available in standard packages of SO-16.
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
Totally Lead-Free; RoHS Compliant (Notes 1 & 2)
Pin Assignments
(Top View)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1IN+
1IN-
FEEDBACK
DTC
CT
RT
GND
C1
2IN+
2IN+
REF
OUTPUT CTRL
V
CC
C2
E2
E1
SO-16
Applications
SMPS
Back Light Inverter
Charger
Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
Typical Applications Circuit
+
+
+
+
12
11 8
3
2
14
15
1
16
5
61013974
50
10V
50
10V
0.001
50
50V
0.1
1mH
2A
5.1k
0.1
47k
1M
150
47
KSA1010
5.1k
5.1k
150
(V
O
=5V, I
O
=1A)
(V
I
=10V to 40V)
GND
V
I
(+)
V
I
(-)
V
O
AZ7500B
V
CC
C2 C1
FEED
BACK
1IN-
REF
2IN-
1IN+
2IN+
CT
RTE2
OUTPUT
CTRL
E1GNDDTC
Pulse Width Modulated Step-down Converter
Pb
Lead-Free
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