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UC2848 Fiches technique(PDF) 3 Page - Texas Instruments |
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UC2848 Fiches technique(HTML) 3 Page - Texas Instruments |
3 / 9 page 3 UC1848 UC2848 UC3848 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, all specifications are over the junction temperature range of −55°C to +125°C for the UC1848, −40°C to +85°C for the UC2848, and 0°C to +70°C for the UC3848. Test conditions are: VCC = 12V, CT = 400pF, CI = 100pF, IOFF = 100 µA, CDC = 100nF, Cvs = 100pF, and Ivs = 400µA, TA = TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS Oscillator Frequency TA = 25°C 240 250 260 kHz 235 265 kHz Ramp Amplitude 1.5 1.65 1.8 V Duty Cycle Clamp Max Duty Cycle V(DMAX) = 0.75 • VREF 73.5 76.5 79.5 % Volt Second Clamp Max On Time 900 1100 ns VCC Comparator Turn-on Threshold 13 14 V Turn-off Threshold 910 V Hysteresis 2.5 3 3.5 V UV Comparator Turn-on Threshold 4.1 4.35 4.6 V RHYSTERESIS Vuv = 4.2V 77 90 103 k Ω Reference VREF TA = 25°C 4.95 5 5.05 V 0 < IO < 10mA, 12 < VCC < 20 4.93 5.07 V Line Regulation 12 < VCC < 20V 4 15 mV Load Regulation 0 < IO < 10mA 3 15 mV Short Circuit Current VREF = 0V 30 50 70 mA Output Stage Rise & Fall Time (Note 1) Cl = 1nF 20 45 ns Output Low Saturation IO = 20mA 0.25 0.4 V IO = 200mA 1.2 2.2 V Output High Saturation IO = -200mA 2.0 3.0 V UVLO Output Low Saturation IO = 20mA 0.8 1.2 V ICC ISTART VCC = 12V 0.2 0.4 mA ICC (pre-start) VCC = 15V, V(UV) = 0 0.5 1 mA ICC (run) 22 26 mA Note 1: Guaranteed by design. Under Voltage Lockout The Under Voltage Lockout block diagram is shown in Fig 1. The VCC comparator monitors chip supply voltage. Hysteretic thresholds are set at 13V and 10V to facilitate off-line applications. If the VCC comparator is low, ICC is low (<500 µA) and the output is low. The UV comparator monitors input line voltage (VIN). A pair of resistors divides the input line to UV. Hysteretic in- put line thresholds are programmed by Rv1 and Rv2. The thresholds are VIN(on) = 4.35V • (1 + Rv1/Rv2′) and VIN(off) = 4.35V • (1 + Rv1/Rv2) where Rv2 ′= Rv2||90k. The resulting hysteresis is VIN(hys) = 4.35V • Rv1 / 90k. When the UV comparator is low, ICC is low (500µA) and the output is low. APPLICATION INFORMATION |
Numéro de pièce similaire - UC2848 |
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Description similaire - UC2848 |
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