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UCC1889 Datasheet(PDF) 4 Page - Texas Instruments |
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UCC1889 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 15 page ADJ: The ADJ pin is used to provide a 12V or an 18V regulated supply without additional external components. To select the 12V option, ADJ pin is left open. To select the 18V option, ADJ pin must be grounded. For other out- put voltages less than 18V, a resistor divider between VOUT, ADJ and GND is needed. Note, however, that for output voltages less than VCC, the device needs addi- tional bootstrapping to VCC from an external source such as the line voltage. If so, precautions must be taken to ensure that total ICC does not exceed 5mA. CT (timing capacitor): The signal voltage across CT has a peak-to-peak swing of 3.7V for 9V VCC. As the voltage on CT crosses the oscillator upper threshold, DRIVE goes low. As the voltage on CT crosses the oscillator lower threshold, DRIVE goes high. DRIVE: This output is a CMOS stage capable of sinking 200mA peak and sourcing 150mA peak. The output volt- age swing is 0 to VCC. GND (chip ground): All voltages are measured with re- spect to GND. TOFF (regulated output control): TOFF sets the dis- charge current of the timing capacitor through an external resistor connected between VOUT and TOFF. TON (line voltage control): TON serves three functions. When CT is discharging (off time), the current through TON is routed to VCC. When CT is charging (on time), the current through TON is split 80% to set the CT charge time and 20% to sense minimum line voltage which oc- curs for a TON current of 220 µA. For a minimum line volt- age of 80V, RON is 330k Ω. The CT voltage slightly affects the value of the charge current during the on time. During this time, the voltage at the TON pin increases from approximately 2.5V to 6.5V. VCC (chip supply voltage): The supply voltage of the device at pin VCC is internally clamped at 9V. Normally, VCC is not directly powered from an external voltage source such as the line voltage. In the event that VCC is directly connected to a voltage source for additional boot- strapping, precautions must be taken to ensure that total ICC does not exceed 5mA. VOUT (regulated output): The VOUT pin is directly con- nected to the power supply output voltage. When VOUT is greater than VCC, VOUT bootstraps VCC. UCC1889 UCC2889 UCC3889 PIN DESCRIPTIONS BLOCK DIAGRAM UDG-93064-2 4 |
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Similar Description - UCC1889 |
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