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S494P
Semiconductor
Pulse Width Modulation
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
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. |
CT |
|
6. |
RT |
|
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=25°C |
|
Characteristic |
Symbol |
Ratings |
Unit |
|
supply voltage |
VCC |
42 |
V |
|
Voltage From Any Pin to Ground |
VIN |
VCC+0.3 |
V |
|
(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 |
Topr |
-40 ~ 85 |
°C |
|
|
|
|
|
|
Storage Temperature |
Tstg |
-65 ~ 150 |
°C |
|
|
|
|
|
|
Recommended Operating Condition
Characteristic |
Symbol |
Min. |
Max. |
Unit |
|
supply voltage |
VCC |
7 |
40 |
V |
|
|
|
|
|
|
|
Voltage on Any Pin Except Pin |
VIN |
-0.3 |
VCC+0.3 |
V |
|
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 |
fOSC |
1 |
300 |
KHz |
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 |
VLINE |
7V < Vcc < 40V |
- |
2 |
25 |
mV |
|
|
|
|
|
|
|
Load Regulation |
VLOAD |
1mA< IREF <10mA |
- |
1 |
15 |
mV |
Temperature Coefficient |
- |
0°C < Ta <70°C |
- |
0.01 |
0.03 |
%/°C |
|
|
|
|
|
|
|
Oscillator Section
Characteristic |
Symbol |
Test Condition |
Min. |
Typ. |
Max. |
Unit |
Oscillator Frequency |
fOSC |
Ct=0.01 , Rt=12 |
- |
10 |
- |
|
Oscillator Frequency Change |
fSOC |
Ct=0.01 , Rt=12 |
|
|
|
|
Over Operating Temperature |
- |
- |
2 |
% |
||
Range |
|
|
|
|
|
|
KSI-L010-000 |
2 |
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