UCC1810 Unitrode Semiconductor, UCC1810 Datasheet

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UCC1810

Manufacturer Part Number
UCC1810
Description
Low Power BiCMOS Dual Current Mode PWM
Manufacturer
Unitrode Semiconductor
Datasheet
Low Power BiCMOS Dual Current Mode PWM
FEATURES
BLOCK DIAGRAM
12/94
150 A Startup Supply Current
2mA Operating Supply Current
Operation to 1MHz
Internal Soft Start
Full-Cycle Fault Restart
Internal Leading Edge Blanking
of the Current Sense Signal
1 Amp Totem Pole Outputs
75ns Typical Response from
Current Sense to Output
1.5% Tolerance Voltage
Reference
DESCRIPTION
The UCC3810 is a high-speed BiCMOS integrated circuit which implements
two synchronized pulse width modulators for use in off-line and DC-to-DC
power supplies.
The UCC3810 provides perfect synchronization between two PWMs by using
the same oscillator. The oscillator’s sawtooth waveform can be used for slope
compensation if required.
Using a toggle flip flop to alternate between modulators, the UCC3810 ensures
that one PWM will not slave, interfere, or otherwise affect the other PWM. This
toggle flip flop also ensures that each PWM will be limited to 50% maximum
duty cycle, insuring adequate off-time to reset magnetic elements.
This IC contains many of the same elements of the UC3842 current mode con-
troller family, combined with the enhancements of the UCC3802, so that power
supply parts count is minimized. These enhancements include leading edge
blanking of the current sense signals, full cycle fault restart, CMOS output driv-
ers, and outputs which remain low even when the supply voltage is removed.
PRELIMINARY
UCC1810
UCC2810
UCC3810
UDG-92062-1

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UCC1810 Summary of contents

Page 1

... UCC3802, so that power supply parts count is minimized. These enhancements include leading edge blanking of the current sense signals, full cycle fault restart, CMOS output driv- ers, and outputs which remain low even when the supply voltage is removed. UCC1810 UCC2810 UCC3810 PRELIMINARY ...

Page 2

... Minimum Duty Cycle COMP Soft Start Rise Time CONNECTION DIAGRAM DIL-16, SOIC-16 (TOP VIEW Package, DW Package current does not ex- Unless otherwise stated, these specifications apply for – UCC1810; – for UCC2810 10V (Note 4 150k; C ...

Page 3

... 10mA (Note OSC COMP Internal Zener Voltage track each other. 3 UCC1810 UCC2810 UCC3810 125 C for UCC1810 for UCC3810 10V (Note 4 MIN TYP MAX UNITS 1.30 1.55 1.80 0.9 1.0 1.1 200 75 55 1.35 1.55 1.75 0.65 0.95 1. ...

Page 4

... The power input to the IC. This pin supplies current CC to all functions including the high current output stages and the precision reference. Therefore critical that V be directly bypassed to PWRGND with an 0 ceramic capacitor. 4 UCC1810 UCC2810 UCC3810 to GND. This pin is regu are between 10k and 470k. T ...

Page 5

... T and high input resistance. The output stage of one error amplifier is shown above. This output stage allows the error amplifier out- put to swing close to GND and as high as one diode drop below 5V with little loss in amplifier performance. 5 UCC1810 UCC2810 UCC3810 ...

Page 6

... TYPICAL CHARACTERISTICS Error Amp and Gain Phase Response Oscillator Frequency vs Temperature I vs Oscillator Frequency CC Oscillator Frequency vs R Maximum Duty Cycle vs R Maximum Duty Cycle vs Frequency 6 UCC1810 UCC2810 UCC3810 and ...

Page 7

... TYPICAL APPLICATION UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. MERRIMACK, NH 03054 TEL. (603) 424-2410 FAX 603-424-3460 7 UCC1810 UCC2810 UCC3810 UDG-94022 ...

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