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

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MC33253

Full Bridge Pre-Driver

Motorola => Freescale 

G_EN

/CCS

IN_HS 10 k

10 k

/IN_HS

10 k

IN_LS

/IN_LS

MC33253

Figure 6. Input Logic and Cross Conduction Suppression

AND

AND

EN_CP/LDO

“1” Enable Charge Pump and LDO

UV_OV

RDY

{“1” Supply is ok

“1” Charge Pump is Ready

BRG_EN

CCS

“0” Cross Conduction Suppression is Enabled

en2hs = G_LOW_LS, en2ls = G_LOW_HS

“1” Cross Conduction Suppression is Disabled

en2hs = “1”, en2ls = “1” en1hs = “0”, en1ls = “0”

AND

AND

en1_hs

OR

AND OUT_HS

“1” Turn-On FET

en2_hs

G_LOW_H

“1” FET is Turned-Off

AND

AND

en1_ls

G_LOW_LS

en2_ls

OR

“1” FET is Turned-Off

OUT_LS

AND

drv_ls

“1” Turn-On FET

Logic Inputs

Logic Input Voltage Range:

Absolute Max :

-0.3 V ... 10 V

Wake Up Function:

(G_EN)

4.5 V ... VCC2

During Wake-Up the logic is supplied from the G_EN pin.

Low Drop Linear Regulator

The low drop linear regulator provides the 5.0 V for the logic section of the driver, the Vgs_ls buffered at LR_OUT and the +13.5 V for the

charge pump, which generates the Vgs_hs. The low drop linear regulator provides 3.5 mA average current per driver stage. If typically VCC2

exceeds 14.5V the output is limited to 14V.

Charge Pump

The charge pump generates the high side driver supply voltage ( Vgs_hs), buffered at CCP_OUT. The basic circuit (Fig 7), shows

charge pump without load:

Figure 7. Charge Pump Basic Circuit

VLR_OUT

Osc.

(2)

D1

Ccp

A

D2

(1)

VCP_OUT

Ccp_out

Vbat

When the oscillator is in low state (1), Ccp is charged through D2 until its voltage reaches Vbat-Vd2. When the oscillator is in high

state (2), Ccp is discharged though D1 in Ccp_out, and final voltage of the charge pump, Vcp_out is Vbat+VLR_OUT - 2Vd. The frequency of

the MC33253 oscillator is about 330 kHz.

MC33253

MOTOROLA

rev3.0 - 9/15

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