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UCC3829DWTR-1 Datasheet(PDF) 8 Page - Texas Instruments |
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UCC3829DWTR-1 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 11 page 8 UCC1829-1/-2/-3 UCC2829-1/-2/-3 UCC3829-1/-2/-3 mately 3 VBE voltages) to determine if the reference is alive. The undervoltage circuit either uses a user pro- grammed level with a 16% hysteresis or an on threshold equal to the VDD clamp voltage and an off threshold of 9V. Once a fault occurs, a soft start cycle takes place. A fault sets the fault latch. The Q output of the fault latch sets the RS delay latch and turns on the 20 µA soft start dis- charge current sink. The Q output of the fault latch is gated, however, by the output of the SS complete com- parator. This insures that a SS cycle cannot start before the previous one has finished. The soft start capacitor then is discharged to 1V which is sensed by the RS delay comparator. The fault latch is then reset. This in turn re- sets the RS delay latch and turns off the 20 µA current sink and turns on a 20 µA current source to charge the SS capacitor. The under voltage detection is set to a default value of 14V turn on (VDD clamp active value) and 9V turn off when the UVLO pin is tied to GND. This default configu- ration can be overridden by connecting a resistor divider between VDD and GND to the UVLO pin. The hysteresis for the user set threshold is 16%. During undervoltage lockout, the self biasing outputs are held "OFF" to prevent accidental turn-on of the power switches. Supply Section The incoming voltage supply VDD is clamped by a shunt VDD Clamp circuit at 14V. VIN VOUT UCC3829-1 ISOLATED FEEDBACK DC SOURCE OR RECTIFIED AC BIAS SUPPLY TYPICAL APPLICATIONS Figure 4. Push-Pull Converter Using UCC3829-1 UDG-98013 |
Similar Part No. - UCC3829DWTR-1 |
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Similar Description - UCC3829DWTR-1 |
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