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UC2914 Fiches technique(PDF) 2 Page - Texas Instruments |
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UC2914 Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 14 page 2 UC1914 UC2914 UC3914 CONNECTION DIAGRAM ELECTRICAL CHARACTERISTICS: Unless otherwise specified, TA = 0°C to 70°C for the UC3914, –40°C to 85°C for the UC2914, and –55°C to 125°C for the UC1914. VCC = 12V, VPUMP =VPUMP(max), SD = 5V, CP1 = CP2 = CPUMP = 0.01 µF. TA =TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS VCC Section ICC (Note 2) 8 15 mA VCC = 35V, (Note 2) 12 20 mA Shutdown ICC SD = 0V 500 900 µA UVLO Turn on threshold 4.0 4.4 V UVLO Hysteresis 100 200 350 mV Fault Timing Section Overcurrent Threshold TJ = 25°C, with respect to VCC –55 –50 –45 mV Over operating temperature, with respect to VCC –57 –50 –42 mV IMAX Input Bias 13 µA CT Charge Current CT = 1V –140 –100 –60 µA CT Discharge Current CT = 1V 2.0 3.0 4.5 µA CT Charge Current CT = 1V, Overload condition –6.0 –3.0 –1.5 mA CT Fault Threshold 2.25 2.50 2.75 V CT Reset Threshold 0.45 0.50 0.55 V Output Duty Cycle Fault condition, IPL = 0 1.5 3.0 4.5 % Input Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . 40V Maximum Forced Voltage SD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V IMAX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VCC LR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Maximum Current FAULT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA PLIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Maximum Voltage, FAULT . . . . . . . . . . . . . . . . . . . . . . . . . 40V Reference Output Current . . . . . . . . . . . . . . . Internally Limited Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . –55°C to +150°C Lead Temperature (Soldering, 10 sec.) . . . . . . . . . . . . . +300°C Unless otherwise indicated, voltages are referenced to ground. Currents are positive into, negative out of specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of package. ABSOLUTE MAXIMUM RATINGS When the output current is less than the fault level, the external output transistor remains switched on. When the output current exceeds the fault level, but is less than the maximum sourcing level programmed by IMAX, the out- put remains switched on, and the fault timer starts to charge CT, a timing capacitor. Once CT charges to 2.5V, the output device is turned off and CT is slowly dis- charged. Once CT is discharged to 0.5V, the IC performs a retry and the output transistor is switched on again. The UC3914 offers two distinct reset modes. In one mode with LR left floating or held low, the IC will repeat- edly try to reset itself if a fault occurs as described above. In the second mode with LR held high, once a fault occurs, the output is latched off until either LR is toggled low, the part is shutdown then re-enabled using SD, or the power to the part is turned off and then on again. This part is offered in both 18 pin DW Wide-Body (SOIC) and Dual-In-Line (DIL) packages. DESCRIPTION (cont.) DIL-18, SOIC-18 (Top View) N or J Package, DW Package |
Numéro de pièce similaire - UC2914 |
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Description similaire - UC2914 |
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