CM494

Features:

· Dual uncommitted 40V, 200mA output transistors.
· 1% accurate 5V reference.
· Dual error amplifiers.
· Wide range, variable dead time.
· Single-ended or push-pull operation.
· Under-voltage lockout with hysteresis.
· Double pulse protection.
· Master or slave oscillator operation.


Application

·Linear Regulators
·Adjustable Supplies
·Switching Power Supplies
·Battery Operated Computers
·Instrumentation
·Computer Disk Drives


Pinout




Specifications

Supply voltage, Vcc(Note 2).............. 45V
Amplifier input voltages............. Vcc + 0.3V
Collector output voltage................ 41V
Collector output current..............  250mA
Continuous total dissipation............1000mW
        @ (or below) 25 free  air temperature range (Note 3)
Storage temperature range........ -65 to + 150
Lead temperature 1 / 16"(1.6mm) from case for 60 seconds
    J package..................... 300
Lead temperature 1 / 16"(1.6mm) from case for 10 seconds
    N package............... .... .260


Description

This of PWM modulator CM494 provides a complete pulse width modulation system in a single monolithic integrated circuit. This device includes a 5V reference accurate to ±1%, two independent amplifiers usable for both voltage and current sensing, an externally synchronizable oscillator with its linear ramp generator, and two-uncommitted transistor output switches. These two outputs may be operated either in parallel for single-ended operation or alternating for push-pull applications with an externally controlled dead-band. This unit is internally protected against double-pulsing of a single output or from extraneous output signals when the input supply voltage is below minimum.
The CM494 contains an on-chip 39V zener diode for high-voltage applications where Vcc would be greater than 40V, and a buffered output steering control that overrides the internal control of the pulse steering flip-flop.