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UC2879DW Fiches technique(PDF) 6 Page - Texas Instruments |
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UC2879DW Fiches technique(HTML) 6 Page - Texas Instruments |
6 / 15 page www.ti.com ( ) 10 DELAY Delay Time 0.89 10 R sec - = · · 1 delay T duty cycle 2 æ ö = · - ç ÷ è ø t DutyCycle T = Period T = DHL DHL T (A to C) T (Bto D) = = UC1879 UC2879 UC3879 SLUS230B – JUNE 1998 – REVISED JUNE 2007 ELECTRICAL CHARACTERISTICS (continued) Unless specified; VC = VIN = V UVSEL = 12 V, CT = 470 pF, RT = 9.53k, RDELSETA-B = RDELSEC-D = 4.8k, CDELSETA-B = CDELSETC-D = 0.01 µF, T A = TJ. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Soft Start/Reset Delay Charge current VSS = 0.5 V –20 –9 –3 µA Discharge current VSS = 1 V 120 230 Restart threshold 4.3 4.7 V Discharge level 300 mV Output Drivers Output Low level IOUT = 10 mA 0.3 0.4 V Output High level IOUT = –10 mA, Referenced to VC 2.2 3 Delay Set (3) Delay time(4) RDELSETA-B = RDELSETC-D = 4.8k 250 370 520 Delay time(4) RDELSETA-B = RDELSETC-D = 1.9k 100 155 220 ns Zero delay(5) VDELSETA-B = VDELSETC-D = 5 V 5 (3) Delay time can be programmed via resistors from the delay set pins to ground. The recommended range for RDELAY is 1.9 kΩ to 10 kΩ. (4) Delay time is defined as: where T is defined in Figure 1. (5) The zero phase shift voltage is the voltage measured at COMP which forces zero phase shift. This condition corresponds to zero effective output power. Zero phase shift voltage has a temperature coefficient of about –2 mV/ °C. Figure 1. Phase Shift, Output Skew and Delay Time Definitions 6 Submit Documentation Feedback |
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