UC3844-D08-T UTC [Unisonic Technologies], UC3844-D08-T Datasheet
UC3844-D08-T
Related parts for UC3844-D08-T
UC3844-D08-T Summary of contents
Page 1
... 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 Order Number Normal Lead Free Plating UC3844-D08-T UC3844L-D08-T UC3844-S08-R UC3844L-S08-R UC3844-S08-T UC3844L-S08-T UC3845-D08-T UC3845L-D08-T UC3845-S08-R ...
Page 2
... UC3844/45 PIN CONFIGURATION PIN DESCRIPTION PIN NO PIN NAME 1 Compensation Error amplifier output, this pin is made available for loop compensation. Voltage Feedback, the inverting input of the Error Amplifier 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 ...
Page 3
... UC3844/45 BLOCK DIAGRAM UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw LINEAR INTEGRATED CIRCUIT QW-R103-010 ...
Page 4
... UC3844/45 ABSOLUTE MAXIMUM RATINGS PARAMETER Total Power Supply and Zener Current Output Current, Source or Sink (Note 2) Output Energy (Capacitive Load per cycle) Current Sense and Voltage feedback Inputs Error Amp Output Sink Current Power Dissipation Junction Temperature Operation Temperature Range Storage Temperature Range Note:1 ...
Page 5
... TOTAL DEVICE Power Supply Zener Voltage Power Supply Current UC3845 (Note 4) UC3844 Note: 1. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible. 2. This parameter is measured at the latch trip point with V 3. Comparator gain is defined as: 4 ...
Page 6
... UC3844/45 TYPICAL CHARACTERISTICS Timing Resistor vs. Oscillator Frequency 100 5.0 2.0 Note: Output Switches At One-Half The Oscillator Frequency 1.0 10k 20k 50k 100k 200k Oscillator Frequency, I OSC Error Amp Open Loop Gain Phase vs. Frequency 100 80 Gain -20 10 100 1.0k 10k 100k Frequency, f (Hz) UNISONIC TECHNOLOGIES CO ...
Page 7
... UC3844/45 TYPICAL CHARACTERISTICS(Cont.) UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury ...