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UCC3800N Datasheet(PDF) 5 Page - Texas Instruments |
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UCC3800N Datasheet(HTML) 5 Page - Texas Instruments |
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5 / 55 page  OUT g I Q = ´ f 1.0 R C = ´ f 1.5 R C = ´ f 5 UCC1800, UCC1801, UCC1802, UCC1803, UCC1804, UCC1805 UCC2800, UCC2801, UCC2802, UCC2803, UCC2804, UCC2805 UCC3800, UCC3801, UCC3802, UCC3803, UCC3804, UCC3805 www.ti.com SLUS270E – MARCH 1999 – REVISED JUNE 2016 Product Folder Links: UCC1800 UCC1801 UCC1802 UCC1803 UCC1804 UCC1805 UCC2800 UCC2801 UCC2802 UCC2803 UCC2804 UCC2805 UCC3800 UCC3801 UCC3802 UCC3803 UCC3804 UCC3805 Submit Documentation Feedback Copyright © 1999–2016, Texas Instruments Incorporated Pin Functions (continued) PIN I/O DESCRIPTION NAME TSSOP, SOIC, DIL LCC OUT 6 15 O OUT is the output of a high-current power driver capable of driving the gate of a power MOSFET with peak currents exceeding ±750 mA. OUT is actively held low when VCC is below the UVLO threshold. The high-current power driver consists of FET output devices, which can switch all of the way to GND and all of the way to VCC. The output stage also provides a very low impedance to overshoot and undershoot. This means that in many cases, external schottky clamp diodes are not required. PWR GND — 12 — Power ground of the IC RC 4 10 I RC is the oscillator timing pin. For fixed frequency operation, set timing capacitor charging current by connecting a resistor from REF to RC. Set frequency by connecting a timing capacitor from RC to GND. For best performance, keep the timing capacitor lead to GND as short and direct as possible. If possible, use separate ground traces for the timing capacitor and all other functions. The frequency of oscillation can be estimated with the following equations: (1) where • frequency is in Hz • resistance is in Ω • capacitance is in farads (2) The recommended range of timing resistors is between 10 k and 200 k, and timing capacitor is 100 pF to 1000 pF. Never use a timing resistor less than 10 k. REF 8 20 O REF is the voltage reference for the error amplifier, and also for many other functions on the IC. REF is also used as the logic power supply for high-speed switching logic on the IC. When VCC is greater than 1 V and less than the UVLO threshold, REF is pulled to ground through a 5-kΩ resistor. This means that REF can be used as a logic output indicating power system status. It is important for reference stability that REF is bypassed to GND with a ceramic capacitor as close to the pin as possible. An electrolytic capacitor may also be used in addition to the ceramic capacitor. A minimum of 0.1-μF ceramic is required. Additional REF bypassing is required for external loads greater than 2.5 mA on the reference. To prevent noise problems with high speed switching transients, bypass REF to ground with a ceramic capacitor very close to the IC package. VCC 7 17 I VCC is the power input connection for this device. In normal operation, VCC is powered through a current limiting resistor. Although quiescent VCC current is very low, total supply current is higher depending on OUT current. Total VCC current is the sum of quiescent VCC current and the average OUT current. Knowing the operating frequency and the MOSFET gate charge (Qg), average OUT current can be calculated from: (3) To prevent noise problems, bypass VCC to GND with a ceramic capacitor as close to the VCC pin as possible. An electrolytic capacitor may also be used in addition to the ceramic capacitor. There must be a minimum of 1 µF in parallel with a 0.1-µF ceramic capacitor from VCC to ground placed close to the device. |
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