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UCC3921 Datasheet(PDF) 2 Page - Texas Instruments |
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UCC3921 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 11 page 2 UCC1921 UCC2921 UCC3921 ELECTRICAL CHARACTERISTICS Unless otherwise specified, TA = 0°C to 70°C for the UCC3921 and –40°C to 85°C for the UCC2921, and –55°C to 125°C for the UCC1921; IVDD = 2mA, CT = 1nF (the minimum allowable value), there is no resistor connected between the SDFLTCH and VSS pins. TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS VDD Section IDD 12 mA Regulator Voltage ISOURCE = 2mA 9 9.5 10.0 V ISOURCE = 10mA 9.15 9.6 10.15 V UVLO Off Voltage 67 8 V Fault Timing Section Overcurrent Threshold TJ = 25°C 47.5 50 53.5 mV Over Operating Temperature 46 50 53.5 mV Overcurrent Input Bias 50 500 nA CT Charge Current VCT = 1V, IPL = 0 –50 –36 –22 µA Overload Condition, VSENSE -VIMAX = 300mV –1.7 –1.2 –0.7 mA CT Discharge Current VCT = 1V, IPL = 0 0.6 1 1.5 µA CT Fault Threshold 2.2 2.45 2.6 V CT Reset Threshold 0.41 0.49 0.57 V Output Duty Cycle Fault Condition, IPL = 0 1.7 2.7 3.7 % CONNECTION DIAGRAM DIL-8 , SOIC-8 (Top View) NorJ, D Packages ABSOLUTE MAXIMUM RATINGS IVDD.......................................... 50mA SDFLTCH Current .............................. 10mA PL Current .................................... 10mA IMAX Input Voltage ..............................VDD Storage Temperature ................... −65°C to +150°C Junction Temperature ................... –55°C to +150°C Lead Temperature (Soldering, 10 sec.) ............. +300°C All voltages are with respect to VSS (the most negative voltage). Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages. dropout. The fault current level is set with an external current sense resistor, while the maximum allowable sourcing current is programmed with a voltage divider from VDD to generate a fixed voltage on IMAX. The cur- rent level, when the output acts as a current source, is equal to VIMAX/RSENSE. If desired, a controlled current start up can be programmed with a capacitor on IMAX. When the output current is below the fault level, the out- put device is switched on. When the output current ex- ceeds the fault level, but is less than the maximum sourcing level programmed by IMAX, the output remains switched on, and the fault timer starts charging CT. Once CT charges to 2.5V, the output device is turned off and performs a retry some time later (provided that the se- lected mode of operation is Automatic Retry Mode). When the output current reaches the maximum sourcing current level, the output acts as a current source, limiting the output current to the set value defined by IMAX. Other features of the UCC3921 include undervoltage lockout, 8-pin Small Outline (SOIC) and Dual-In-Line (DIL) packages, and a Latched Operation Mode option, in which the output is latched off once CT charges to 2.5V and stays off until either SDFLTCH is toggled (for greater than 1ms) or the IC is powered down and then back up. DESCRIPTION (continued) |
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