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

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MC33253

Full Bridge Pre-Driver

Motorola => Freescale 

MC33253

The Figure 8 represents a simplified circuitry of the high side gate driver.

Figure 8. High Side Gate Driver

VLR-OUT

Tosc2

Ccp

C1 C2

Tosc1

CP_out

D1

Ccp_out

D2

(3) Vcc

T1

GATE_HS

T2

Rg

HS

MOSFET

SRC_HS

M

LS

MOSFET

pins

The transistors Tosc1 and Tosc2 are the oscillator switching MOSFETs. When Tosc1 is on, the oscillator is at low level. When

Tosc2 is on, the oscillator is at high level. The high side MOSFET predriver is composed of two transistors T1 and T2. When T1 is on

the HS MOSFET is turn on, when T2 is on the HS MOSFET is off. The capacitor Ccp_out provides peak current to the HS MOSFET

through T1 during turn on (3) as shown in figure 11.

Ccp

Ccp choice depends on Power MOSFET characteristics and the working switching frequency. The following diagrams show the

influence of Ccp value on Vcp_out average voltage level. The diagrams are given at two different frequencies for two power MOSFETs

(MTP60N06HD and MPT36N06V).

Figure 9. Vcp_out Versus Ccp

21

20.5

20

19.5

19

18.5

18

5

25

45

65

85

Ccp (nF)

MTP60N06HD (Qg=50nC)

MC33253

20KhZ

100 KhZ

Figure 10.

21.5

21

20.5

20

19.5

19

18.5

5

25

45

65

85

Ccp (nF)

MTP36N06V (Qg=40nC)

20kHz

100kHz

MOTOROLA

rev3.0 - 10/15

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