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Moteur de recherche de fiches techniques de composants électroniques |
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Moteur de recherche de fiches techniques de composants électroniques |
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TC25C25EPE Fiches technique(PDF) 6 Page - TelCom Semiconductor, Inc |
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TC25C25EPE Fiches technique(HTML) 6 Page - TelCom Semiconductor, Inc |
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6 / 7 page  4-116 TELCOM SEMICONDUCTOR, INC. TC25C25 TC35C25 BICMOS PWM CONTROLLERS The resistor (RD) controls the period of dead time (TD). During dead time this resistor (RD) current is the sum of the CT discharge current and the ICHG current. The value for RD can range from >1 Ω to <900Ω. Dead time increases when RD is increased. See graph in Typical Characteristic Curve for dead time resistor value. OSCILLATOR FREQUENCY AND OUTPUT DEAD TIME The oscillator frequency (FO) = 1 TCHG + TD TCHG is the charging duration of CT. One of the PWM Controller output drivers is ON during charging of CT. TD is the output dead time when both of the output drivers are inactive. Resistor (RT) sets the Capacitor (CT) charging current. To choose an oscillator frequency (FO), first select the period of dead time (TD) required. Calculate the capacitor charge time (TCHG). TCHG = 1 – FO x TC FO Select a capacitor in the range of 100 pF to 1000 pF for CT. See graph in Typical Characteristic Curve. Calculate capacitor charging current (ICHG). CT in Farads, TCHG in seconds, ICHG in amperes, and RT in ohms. ICHG = 2.5 x CT TCHG RT = 1.5 ICHG 1mA TO OUTPUT SHUTDOWN IS VON = 9.2V VOFF = 7V 75 µA 7V 9.2V IS = STARTUP CURRENT VIN V+ IN CT 5 DISCH 7 RT 6 + – 1.5V 3 SYNC VDD ICHARGE ≈ 1.5V RT 1/FO TD 3V .5V ON-TIME (TCHG) PIN 5 OUTPUT DEAD TIME (TD) PIN 4 RD 3V 0.5V UNDERVOLTAGE LOCKOUT SECTION The typical turn on threshold is 9.2V for operation of this family of PWM Controllers. When supply voltage at pin 15 drops below 7V, after normal operation above 9.2V, lockout occurs and both output drives to pin 11 and 14 are termi- nated. |
Numéro de pièce similaire - TC25C25EPE |
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Description similaire - TC25C25EPE |
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