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APPLICATION INFORMATION

Regulator

0.1

µF

1

2

3

5

4

Input

TPS2816

Load

Regulator

4.7

µF

1

2

3

5

4

Input

TPS2816

Load

0.1

µF

+

TPS2816-EP, TPS2817-EP, TPS2818-EP

TPS2819-EP, TPS2828-EP, TPS2829-EP

SGDS039 – FEBRUARY 2008

MOSFETs are voltage-driven devices that require very little steady-state drive current. However, the large input

capacitance (200 pF to 3000 pF or greater) of these devices requires large current surges to reduce the turn-on

and turn-off times. The TPS2816 series of high-speed drivers can supply up to 2 A to a MOSFET, greatly

reducing the switching times. The fast rise times and fall times and short propagation delays allow for operation

in today's high-frequency switching converters.

In addition, MOSFETs have a limited gate-bias voltage range, usually less than 20 V. The TPS2816 series of

drivers extends this operating range by incorporating an on-board series regulator with an input range up to 40 V.

This regulator can be used to power the drivers, the PWM chip, and other circuitry, providing the power

dissipation rating is not exceeded.

When using these devices, care should be exercised in the proper placement of the driver, the switching

MOSFET, and the bypass capacitor. Because of the large input capacitance of the MOSFET, the driver should

be placed close to the gate to eliminate the possibility of oscillations caused by trace inductance ringing with the

gate capacitance of the MOSFET. When the driver output path is longer than approximately 2 inches, a resistor

in the range of 10

Ω should be placed in series with the gate drive as close as possible to the MOSFET. A

ceramic bypass capacitor is also recommended to provide a source for the high-speed current transients that the

Figure 21).

The on-board series regulator supplies approximately 20 mA of current at 11.5 V, some of which can be used for

Copyright © 2008, Texas Instruments Incorporated

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Product Folder Link(s): TPS2816-EP TPS2817-EP TPS2818-EP TPS2819-EP TPS2828-EP TPS2829-EP