AMS494 AMS [Advanced Monolithic Systems Ltd], AMS494 Datasheet

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AMS494

Manufacturer Part Number
AMS494
Description
Internal regulator provides a stable 5V reference supply
Manufacturer
AMS [Advanced Monolithic Systems Ltd]
Datasheet
Internal Block Diagram
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.
Features
• Internal regulator provides a stable 5V reference supply
• Uncommitted output TR for 200mA sink or source
• Output control for push-pull or single-ended operation
• Variable duty cycle by dead time control (pin 4) Complete
• On-chip oscillator with master or slave operation
• Internal circuit prohibits double pulse at either output
trimmed to 5%
current
PWM control circuit
Advanced Monolithic Systems http://www.ams-semitech.com
1
PIN CONFIGURATION
1B
2B
3B
4B
5B
6B
7B
E
5
(Top View)
1
2
3
4
6
7
8
1 6
1 5
1 4
1 3
1 2
1 1
1 0
9
AMS494
1C
2C
3C
4C
5C
6C
7C
COM

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AMS494 Summary of contents

Page 1

... On-chip oscillator with master or slave operation • Internal circuit prohibits double pulse at either output 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 ...

Page 2

... Advanced Monolithic Systems http://www.ams-semitech.com Symbol Value 250 0 (AMS494CN 0.9 (AMS494CD +70 OPR T - 150 STG 2 http://www.tc-ic.com AMS494 Unit ...

Page 3

... CE(SAT 15V -200mA CC(SAT 40V 40V C(OFF 40V E(OFF Pin 15V CC REF AMS494 Min. Typ. Max. Unit 4.75 5 0. KHz - - -2.0 - 3.0 3 ...

Page 4

... Typical Application Pulse Width Modulated Step-down Converter Advanced Monolithic Systems http://www.ams-semitech.com AMS494 4 http://www.tc-ic.com AMS494 ...

Page 5

... Mechanical Dimensions Package 6.40 0.20 0.252 0.008 #1 # 7.62 0.300 Advanced Monolithic Systems http://www.ams-semitech.com 16-DIP 3.25 0.20 0.128 0.008 5.08 MAX 0.200 5 AMS494 0.38 MIN 0.014 3.30 0.30 0.130 0.012 ...

Page 6

... Advanced Monolithic Systems http://www.ams-semitech.com (Continued) 16-SOP 0.05 MIN 0.002 1.55 0.10 0.061 0.004 #16 #9 0.30 1.80 MAX 0.071 0.012 0.20 0.008 6 http://www.tc-ic.com AMS494 ...

Page 7

... Ordering Information Product Number Package AMS494CN 16 DIP AMS494CD 16 SOP Advanced Monolithic Systems http://www.ams-semitech.com Operating Temperature AMS494 ...

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