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PDF S494P Data sheet ( Hoja de datos )

Número de pieza S494P
Descripción Pulse Width Modulation
Fabricantes AUK corp 
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Semiconductor
S494P
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 -40to85.
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.
S494P
Marking
S494P
Package Code
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

1 page




S494P pdf
S494P
INFORMATION
The basic oscillator(switching)frequency is controlled by an external resistor (Rt) and
capacitor(Ct). The relationship between the values of Rt Ct and frequency is shown in.
The level of the sawtooth wave form is compared with an error voltage by the pulse width
modulated comparator. The output of the PWM Comparator directs the pulse steering flip
flop and the output control logic.
The error voltage is generated by the error amplifier. The error amplifier boosts the voltage
difference between the output and the 5V internal reference. See Figure 7 for error amp
sensing techniques. The second error amp is typically used to implement current limiting.
The output control logic (Pin13) selects either push-pull or single-ended operation of the
output transistors (see Figure6). The dead time control prevents on-state overlap of the
output transistors as can be seen is Figure5. The dead time is approximately 3 to 5% of the
total period if the dead time control(pin4) is grounded. This dead time can be increased by
connecting the dead time control to a voltage up to 5 V. The frequency response of the
error amps can be modified by using external resistors and capacitors. These components
are typically connected between the compensation terminal (pin3) and the inverting input
of the error amps(pin2 or pin15). The switching frequency of two or more S494 circuits can
be synchronized. The timing capacitor, Ct is connected as shown in Figure 8. Charging
current is provided by the master circuit. Discharging is through all the circuits slaved to
the master. Rt is required only for the master circuit.
Operating Waveform
KSI-L010-000
5

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