MC33253 查看數據表（PDF） - Motorola => Freescale

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MC33253

Full Bridge Pre-Driver

Motorola => Freescale 

MC33253

/IN_HS

or /IN_LS

Figure 3. Dynamic Characteristics

50%

50%

IN_HS

or IN_LS

50%

GATE_HS

or GATE_LS 50%

tpd

tf

10% 90%

50%

tpd

tr

90%10%

50%

Driver Characteristics

Turn-On

For turn-on the current required to charge the gate source capacitor Ciss in the specified time can be calculated as follows:

Peak Current for Rise/Fall Time (tr) and a typical PowerMosFET Gate Charge Qg. IP = Qg/tr = 75 nC/80 ns ª 1.0 A

Turn-Off

The peak current for turn-off can be obtained in the same way as for turn-on. In addition to the dynamic current, required to

turn-off or turn-on the FET, various application related switching scenarios have to be considered:

The output driver sources a peak current of up to 1A for 200 ns to turn on the gate. After 200 ns 100 mA are provided

continuously to maintain the gate charged. The output driver sinks a peak current of up to 1A for 200 ns to turn off the gate. After

200 ns 100 mA are sinked continuously to maintain the gate discharged. In order to withstand high dV/dt spikes a low resistive

path between gate and source is implemented during the off state.

Figure 4. OFF-State Driver Requirement

Flyback Spike charge LS-Gate via Crss Flyback Spike pull down HS-

Charge Current Irss up to 2.0 A! Uncon- Drain VGS Increase Delayed

trolled Turn-On of Low Side FET

Turn-Off of High Side FET

Flyback Spike charge LS-Gate via

Crss Charge Current Irss up to 2.0 A!

Delayed Turn-Off of Low Side FET

Flyback Spike pull down HS-

Drain VGS Increase Uncontrolled

Turn-On of High Side FET

Crss

g_hs

VGATE

Ciss

Irss Crss

g_ls

OFF

VBAT

Crss

g_hs

L1 ILOAD Ciss

Crss

g_ls

OFF

VBAT

Crss

OFF

g_hs

L1 ILOAD

Ciss

Crss

g_ls

VBAT

Crss

OFF

VGATE

-VDRN

g_hs

L1 ILOAD

Ciss

Crss

g_ls

VBAT

L1 ILOAD

Ciss

Ciss

Ciss

Ciss

Driver Requirement: Low Driver Requirement: Low Resistive Driver Requirement:

Driver Requirement: Low Resistive

Resistive Gate-Source Gate Source Path during OFF-State. High Peak Sink Current Capab. Gate-Source Path during OFF-State

Path during OFF-State High Peak Sink Current Capab.

MC33253

MOTOROLA

rev3.0 - 7/15

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