AZ494A_06 Datasheet, PDF (2/13 Pages) BCD Semiconductor Manufacturing Limited – PULSE-WIDTH-MODULATION CONTROL CIRCUITS

PULSE-WIDTH-MODULATION CONTROL CIRCUITS
Pin Configuration
1IN +
1IN -
FEEDBACK
DTC
CT
RT
M/P Package
(SOIC-16/DIP-16)
1
16
2
15
3
14
4
13
5
12
6
11
2IN +
2IN -
REF
OUTPUT CTRL
V_CC
C2
GND
7
10
E2
C1
8
9
E1
Figure 2. Pin Configuration of AZ494A/C (Top View)
Output Function Control Table
Signal for Output Control
V_I = GND
V_I = V_REF
Output Function
Single-ended or parallel output
Normal push-pull operation
Data Sheet
AZ494A/C
Functional Block Diagram
RT ⁶
5
CT
Oscillator
Dead-Time Control
Comparator
4
DTC
+
0.12V
1
1IN +
1IN - ²
Error Amplifier 1
+
+
PWM
Comparator
2IN + ¹⁶
2IN - ¹⁵
Error Amplifier 2
+
3
FEEDBACK
0.7mA
OUTPUT CTRL
13
Pulse-Steering
Flip-Flop
D
CK
Reference
Regulator
8 _C1
Q1
9 _E1
C2
11
Q2
10
E2
12
V_CC
14
REF
7
GND
Figure 3. Functional Block Diagram of AZ494A/C
Apr. 2006 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
2