FAN3226C datasheet(9/12 Pages) FAIRCHILD

Nome de Peças	FAN3226C

Descrição Electrónicos	Application Review and Comparative Evaluation of Low-Side Gate Drivers

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Fabricante Electrônico	FAIRCHILD [Fairchild Semiconductor]

Página de início	http://www.fairchildsemi.com

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AN-6069

APPLICATION NOTE

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Rev. 1.0.3 • 1/6/10

9

In both these circuits, there is a voltage transient that may

last for 50-100ns as the current increases to the limits of the

driver. A compact layout using surface mount components

keeps the loop area small to minimize parasitic inductance.

The two previous circuits require a unique surface mount

layout. It is possible to evaluate driver current capability by

connecting a relatively large capacitive load on the output of

a driver with the simple circuit shown in Figure 21.

Figure 21. "Large" Load Test Circuit

For a starting point, CLOAD is chosen to be 100 times larger

than the load used for rise and fall time measurements and

the input is driven with a 1kHz square wave. On typical

datasheets, 2A drivers are specified with 1nF load for the

rise and fall time specifications, so CLOAD would be selected

to be 0.1µF. This relatively large load prevents the output

from changing rapidly, allowing the driver output current to

reach its internal limiting value. A current probe, IPRB, can

be used to monitor the output current along with the output

voltage VOUT on an oscilloscope. This enables plotting the

output current available at the corresponding output voltage.

Bench comparisons have shown that the current

measurement obtained using this method agrees closely with

that obtained using the clamp circuits in Figure 19 and

Figure 20. In addition, the slower current rise and fall times

allow the current measurements to be made comfortably

within the bandwidth limits of a current probe.

Figure 22 shows the waveforms obtained using the test

circuit shown in Figure 21 to evaluate a 2A sink / 1.5A

source driver (FAN3227C) with a compound output stage.

When the driver input, VIN, goes high, there is a transient

glitch on the VOUT trace as the output current quickly

increases to 3A through the inductance of the current probe

loop. After approximately 70ns, the current has reached its

peak value and the voltage spike across the parasitic

inductances vanishes. With VOUT = 6V, the output current is

measured as 1.5A (source current).

Figure 22. Compound Driver Current Source

Waveforms

Figure 22 shows the leading spike across the inductance

introduced by the wire loop inserted in the circuit to enable

use of a current probe. If the wire loop is removed and the

0.1µF surface mount capacitor is installed in a layout with

minimal parasitic inductance, the waveforms shown in

Figure 23 are obtained. In short intervals where the voltage

waveform is approximately linear, the basic relation is:

⎟

⎠

⎞

⎜

⎝

⎛

⋅

=

dT

dV

C

I

OUT

LOAD

(16)

can be applied to provide an estimate of the current.

Figure 23. Compound Driver Current Estimation

The oscillogram in Figure 23 allows calculation of current

during the cursor interval as:

A

8

.

2

ns

6

.

40

V

131

.

1

µF

1

.

0

I

=

⎟

⎠

⎞

⎜

⎝

⎛

⋅

=

(17)

providing close agreement with the peak value seen in the

IOUT trace in Figure 22. A similar calculation around VOUT =

6V provides a current estimation of 1.5A, nearly identical to

the result obtained with direct current measurement using a

current probe. The close agreement between the current

measurement techniques using the large load helps develop

confidence in the results obtained.

Nº de peça semelhante - FAN3226C

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Fairchild Semiconductor	FAN3226C	1Mb / 22P	Single 2A High-Speed, Low-Side Gate Driver
	FAN3226C	1Mb / 18P	Single 1A High-Speed, Low-Side Gate Driver
	FAN3226C	1Mb / 18P	Dual-4A, High-Speed, Low-Side Gate Drivers
	FAN3226C	1Mb / 18P	Dual-2A, High-Speed, Low-Side Gate Drivers
	FAN3226C	1Mb / 25P	Dual 4A High-Speed, Low-Side Gate Drivers

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Descrição semelhante - FAN3226C

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Texas Instruments	LM5100A	1Mb / 37P	[Old version datasheet] High-Voltage, High-Side and Low-Side Gate Drivers
Diodes Incorporated	DGD2110	1Mb / 12P	HIGH-SIDE AND LOW-SIDE GATE DRIVERS IN SO-16 Rev. 5 - 2 October 2019
Texas Instruments	LM5100AM_NOPB	1Mb / 28P	[Old version datasheet] 3A, 2A and 1A High Voltage High-Side and Low-Side Gate Drivers
National Semiconductor ...	LM5100B	812Kb / 15P	3A, 2A and 1A High Voltage High-Side and Low-Side Gate Drivers
Diodes Incorporated	DGD2110	1Mb / 12P	HIGH-SIDE AND LOW-SIDE GATE DRIVERS IN SO-16 (TYPE TH)
Fairchild Semiconductor	FAN3213	1Mb / 18P	Dual-4A, High-Speed, Low-Side Gate Drivers
	FAN3223	1Mb / 25P	Dual 4A High-Speed, Low-Side Gate Drivers
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