AMS494
Features
• Internal regulator provides a stable 5V reference supply
trimmed to 5%
• Uncommitted output TR for 200mA sink or source
current
• Output control for push-pull or single-ended operation
• Variable duty cycle by dead time control (pin 4) Complete
PWM control circuit
• On-chip oscillator with master or slave operation
• Internal circuit prohibits double pulse at either output
PIN CONFIGURATION
1B
2B
3B
4B
5B
6B
7B
E
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1C
2C
3C
4C
5C
6C
7C
COM
Description
The
AMS494
is used for the control circuit of the PWM
switching regulator. The
AMS494
consists of 5V reference
voltage circuit, two error amplifiers, flip flop, an output con-
trol circuit, a PWM comparator, a dead time comparator and
an oscillator. This device can be operated in the switching
frequency of 1 KHz to 300 KHz.
(Top View)
Internal Block Diagram
1
Advanced Monolithic Systems http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
