DATA SHEET
BIPOLAR ANALOG INTEGRATED CIRCUIT
µPC494
SWITCHING REGULATOR CONTROL CIRCUIT
DESCRIPTION
The µPC494 is an inverter control unit which provides all the control circuitry for PWM type switching regulators.
Included in this device is the voltage reference, dual error amplifiers, oscillator, pulse width modulator, pulse
steering flip flop, dual alternating output switches and dead-time control.
FEATURES
• Complete PWM power control circuit.
• Adjustable dead-time (0 to 100%).
• No double pulsing of same output during load transient condition.
• Dual error amplifiers have wide common mode input voltage capability (−0.3 V to VCC−2 V).
• Circuit architecture provides easy synchronization.
• Uncommitted outputs for 250-mA sink or source.
• With miss-operation prevention circuit for low level supply voltage.
• Full pin-compatible TL494C.
5 ORDERING INFORMATION
5
PIN CONFIGURATION (Top View)
Non-Inv. Input
1
16
Non-Inv. Input
16-pin plastic DIP (7.62 mm (300))
Inv. Input
2
15
Inv. Input
µPC494G
16-pin plastic SOP (9.53 mm (375))
3
14
Ref Out
µPC494GS
16-pin plastic SOP (7.62 mm (300))
Feed-Back
Dead-Time
Control
4
13
Output Control
CT
5
12
VCC
RT
6
11
C2
GND
7
10
E2
C1
8
9
E1
Part Number
Package
µPC494C
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. G12649EJ4V0DS00 (4th edition)
(Previous No. IC-1299)
Date Published November 2000 NS CP(K)
Printed in Japan
The mark 5 shows major revised points.
©
1988,2000
