ZXGD3105N8 datasheet(10/13 Pages) DIODES

10 / 13 page

ZXGD3105N8

Document Number DS35101 Rev. 1 – 2

10 of 13

www.diodes.com

November 2011

A Product Line of

Diodes Incorporated

ZXGD3105N8

Gate driver

The controller is provided with single channel high current gate drive output, capable of driving one or more N-

channel power MOSFETs. The controller can operate from Vcc of 4.5V to drive both standard MOSFETs and logic

level MOSFETs.

The Gate pins should be as close to the MOSFET’s gate as possible. A resistor in series with GATE pin helps to

control the rise time and decrease switching losses due to gate voltage oscillation. A diode in parallel to the resistor

is typically used to maintain fast discharge of the MOSFET’s gate.

Figure 3 - Typical connection of the ZXGD3105 to the synchronous MOSFET

Quiescent current consumption

The quiescent current consumption of the controller is the sum of IREF and IBIAS. For an application that requires ultra-

low standby power consumption, IREF and IBIAS can be further reduced by increasing the value of resistor RREF and

RBIAS.

Bias Current

IBIAS

Ref Current

IREF

Bias Resistor

RBIAS

Ref Resistor

RREF

Quiescent Current

0.25mA

0.61mA

39.2K

Ω

15.4K

Ω

0.86mA

0.35mA

0.81mA

28.0K

Ω

11.5K

Ω

1.16mA

0.46mA

0.99mA

21.5K

Ω

9.3K

Ω

1.45mA

0.50mA

1.00mA

19.6K

Ω

8.9K

Ω

1.50mA

0.55mA

1.13mA

17.8K

Ω

8.1K

Ω

1.68mA

0.80mA

1.66mA

12.1K

Ω

5.6K

Ω

2.46mA

Table 2 – Quiescent current consumption for different resistor values at Vcc=10V

IREF also controls the gate driver peak sink current whilst IBIAS controls the peak source current. At the default current

value of IREF and IBIAS of 1.02mA and 0.54mA, the gate driver is able to provide 2A source and 6A sink current. The

gate current decreases if IREF and IBIAS are reduced. Care must be taken in reducing the controller quiescent current

so that sufficient drive current is still delivered to the MOSFET particularly for high switching frequency application.

ZXGD3105N8 Datasheet(PDF) 10 Page - Diodes Incorporated

ZXGD3105N8 Datasheet(HTML) 10 Page - Diodes Incorporated

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13

Datasheet Download

Link URL