HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
UNISONIC TECHNOLOGIES CO., LTD
UC2844/45
LINEAR INTEGRATED CIRCUIT
HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS
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Description
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
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QW-R103-051.B
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 ...
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