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UCC24610DRBT Datasheet(PDF) 8 Page - Texas Instruments |
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UCC24610DRBT Datasheet(HTML) 8 Page - Texas Instruments |
8 / 35 page UCC24610 SLUSA87B – AUGUST 2010 – REVISED SEPTEMBER 2010 www.ti.com TERMINAL FUNCTIONS (continued) TERMINAL I/O DESCRIPTION NAME NO. VCC (Positive Power Input) Connect a DC power voltage to VCC. Bypass VCC to GND with a 0.1-µF or larger ceramic capacitor using short PC board tracks. VCC supplies power to all circuits in the UCC24610. VCC 4 I Under-Voltage Lockout (UVLO) comparators prevent operation until VCC rises above VCC(on). VCC can be used to safely turn off the UCC24610 by pulling VCC below VCC(off). In the event that VCC drops below VCC(off), GATE immediately falls Low and EN/TOFF is internally connected to GND with a 10-k Ω resistance. VD (Drain-Sense Voltage) Connect this pin as close as possible to the controlled MOSFET drain pad through a short PC board track, to minimize the effects of trace inductance on VD. VD must be >1.5 V and the TOFF timer must be expired before the device may be armed to allow the controlled MOSFET to be turned on the next switching cycle. Once armed, the controlled MOSFET is turned on (GATE goes High) when VD falls more than -150 mV below VS. At that threshold, VD 8 I the GATE output goes High and the TON timer is triggered. GATE remains High at least as long as the programmed TON time has not expired, unless a pulse at the SYNC input is detected. After TON has expired, the GATE output is turned off when VD-VS voltage decreases to -5 mV. If VD-VS decreases to -5 mV before TON expires, the controller enters Light-Load Mode and the GATE pulse for the next switching cycle is suppressed. When the VD voltage increases to 1.5 V, the TOFF timer is triggered and the GATE output is prevented from turning on during the TOFF interval. VS (Source-Sense Voltage) VS 7 I Connect this pin as close as possible to the controlled MOSFET source pad through a short PC-board track, to minimize the effects of trace inductance on VS. 8 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): UCC24610 |
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