Atmel S494P Service Manual
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S494P
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Description
The S494 is a monolithic integrated circuit which includes all the necessary building blocks
for the design of pulse width modulate(PWM) switching power supplies, including push-pull,
bridge and series configuration. The device can operate at switching frequencies between
1KHz and 300KHz and output voltage up to 40V. The S494 is specified over an operating
temperature range of -40℃to85℃.
Features
• Uncommitted output transistors capable of 200mA source or sink
• Internal protection from double pulsing of out-puts with narrow pulse widths or with
supply voltages bellows specified limits
• Easily synchronized to other circuits
• Dead time control comparator
• Output control selects single-ended or push-pull operation
Ordering Information
Pulse Width Modulation
Type NO. Marking Package Code
S494P S494P DIP-16
Outline Dimensions unit : mm
PIN Connections
1. Non-INV Input
2. INV Input
3. Feed-Back
4. Dead-Time Control
5. C
T
6. R
T
7. GND
8. C1
9. E1
10. E2
11. C2
12. Vcc
13 Output Control
14. Ref Out
15. INV-Input
16. Non-INV Input
KSI-L010-000
1
S494P
Absolute Maximum Ratings Ta =2 5°C
Characteristic Symbol Ratings Unit
supply voltage VCC 42 V
Voltage From Any Pin to Ground
(except pin 8 and pin 11)
Output Collector Voltage VC1, VC2 42 V
Peak Collector Current IC1, IC2 250 mA
Power Dissipation PD 1500 mW
Operating Temperature T
Storage Temperature T
Recommended Operating Condition
Characteristic Symbol Min. Max. Unit
supply voltage VCC 7 40 V
Voltage on Any Pin Except Pin
8 and 11(Referenced to Ground)
Output Voltage VC1, VC2 -0.3 40 V
Output Collector Current IC1, IC2 - 200 mA
Timing Capacitor Ct 470 - PF
Timing Capacitor Ct - 10
Timing Resistor Rt 1.8 500
Oscillator Frequency f
V
V
IN
-40 ~ 85
opr
-65 ~ 150
stg
-0.3 VCC+0.3 V
V
IN
1 300 KHz
OSC
+0.3 V
CC
°C
°C
㎌
㏀
Electrical Characteristics
Reference Section
Characteristic Symbol Test Condition Min. Typ. Max. Unit
Reference Voltage Vref Iref = 1.0mA 4.75 5.00 5.25 V
Line Regulation V
Load Regulation V
Temperature Coefficient -
7V < Vcc < 40V - 2 25 mV
LINE
LOAD
1mA< I
0°C < Ta <70°C
<10mA
REF
- 1 15 mV
- 0.01 0.03
%/°C
Oscillator Section
Characteristic Symbol Test Condition Min. Typ. Max. Unit
C
Oscillator Frequency f
Oscillator Frequency Change
Over Operating Temperature
Range
Δ f
OSC
SOC
C
=0.01 ㎌, R
t
=0.01 ㎌, R
t
=12 ㏀
t
=12 ㏀
t
- 10 -
- - 2 %
㎑
KSI-L010-000
2
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