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Unisonic Technologies

UC2844 Datasheet Preview

UC2844 Datasheet

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

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UNISONIC TECHNOLOGIES CO., LTD
UC2844/45
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE
CURRENT MODE PWM
CONTROLLERS
„ DESCRIPTION
The UTC UC2844/2845 are high performance fixed frequency
current mode controllers that specifically designed for Off-Line and
DC to DC converter applications with minimal external parts count.
The differences between UC2844 and UC2845 are the maximum
duty cycle ranges and under-voltage lockout thresholds. The
UC2844 ideally suited to off-line applications with UVLO thresholds
of 16V(ON) and 10V(OFF), and UC2845 has UVLO thresholds of
8.5V(ON) and 7.6V(OFF) for lower voltage applications.
„ FEATURES
* Operation output switching frequency up to 500 kHz
* Output deadtime adjustable from 50% to 70%
* Automatic feed forward compensation
* Latching PWM for cycle-by-cycle current limiting
* High current totem pole output
* Internally trimmed reference with under voltage lockout
* UVLO with hysteresis
* Low startup and operating current
„ ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UC2844L-S08-R
UC2844G-S08-R
UC2844L-S08-T
UC2844G-S08-T
UC2845L-S08-R
UC2845G-S08-R
UC2845L-S08-T
UC2845G-S08-T
Package
SOP-8
SOP-8
SOP-8
SOP-8
Packing
Tape Reel
Tube
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2012 Unisonic Technologies Co., Ltd
1 of 7
QW-R103-051.B




Unisonic Technologies

UC2844 Datasheet Preview

UC2844 Datasheet

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS

No Preview Available !

UC2844/45
„ PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
„ PIN DESCRIPTION
PIN NO
1
2
3
4
5
6
7
8
PIN NAME
Compensation
VFB
ISENSE
RT/CT
GND
Output
VCC
VREF
FUNCTION
Error amplifier output, this pin is made available for loop compensation.
Voltage Feedback, the inverting input of the Error Amplifier. It is normally connected to the
switching power supply output through a resistor divider.
A voltage proportional to inductor current is connected to this input. The PWM uses this
information to terminate the output switch conduction.
The Oscillator frequency and maximum output duty cycle are programmed by connecting
resistor RT to VREF and capacitor CT to ground. Operation to 1 MHz is possible.
Power ground.
This output directly drives the gate of a power MOSFET. Peak currents up to 1A are
sourced and sunk by this pin. The output switches at one-half the oscillator frequency.
Positive supply.
Reference output, provides charging current for capacitor CT though resistor RT.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R103-051.B


Part Number UC2844
Description HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
Maker Unisonic Technologies
Total Page 7 Pages
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