33883 datasheet(12/21 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33883

FUNCTIONAL DEVICE OPERATION

DRIVER CHARACTERISTICS

Figure 5 represents the external circuit of the high-side

gate driver. In the schematic, HSS represents the switch that

is used to charge the external high-side MOSFET through the

GATE_HS terminal. LSS represents the switch that is used to

discharge the external high-side MOSFET through the

GATE_HS terminal. A 180K

Ω internal typical passive

discharge resistance and a 18 V typical protection zener are

in parallel with LSS. The same schematic can be applied to

the external low-side MOSFET driver simply by replacing

terminal CP_OUT with terminal LR_OUT, terminal GATE_HS

with terminal GATE_LS, and terminal SRC_HS with GND.

Figure 5. High-Side Gate Driver Functional Schematic

The different voltages and current of the high-side gate

driver are illustrated in Figure 6. The output driver sources a

peak current of up to 1.0 A for 200 ns to turn on the gate. After

200 ns, 100 mA is continuously provided to maintain the gate

charged. The output driver sinks a high current to turn off the

gate. This current can be up to 1.0 A peak for a 100 nF load.

Note GATE_HS is loaded with a 100 nF capacitor in the

chronograms. A smaller load will give lower peak and DC charge or

discharge currents.

Figure 6. High-Side Gate Driver Chronograms

HSS

CP_OUT

IGATE_HS

Icharge HSS

Idischarge LSS

GATE_HS1

LSS

SRC_HS1

180

Ω

18V

HSSpulse_IN

LSS_IN

HSSDC_IN

IN_HS1

1.0 A Peak

100 mA Typical

1.0 A Peak

100 mA Typical

-1.0 A Peak

IN_HS1

HSSpulse_IN

HSS DC_IN

LSS_IN

Idischarge LSS

IGATE_HS

Icharge HSS

33883 Datasheet(PDF) 12 Page - Freescale Semiconductor, Inc

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