STDRIVE102BH datasheet(15/56 Pages) STMICROELECTRONICS

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Device description

The STDRIVE102BH and the STDRIVE102H are triple half-bridge gate drivers suitable for 3-phase brushless

motor driving. From now on the naming convention STDRIVE102BH/H is adopted to indicate indistinctly one or

the other.

5.1

Power management section

The power management section of the STDRIVE102BH/H (Figure 5) is composed by:

•

One LDO linear regulator with 12 V output; it is used to generate the VCC for the gate drivers’ supply. Its

input VS can be connected to VM or to an external voltage (up to 50 V operative).

•

One LDO linear regulator, which generates the 3.3 V supply (VDD). Its input REGIN_3V3 ranges between

3.6 V and 15 V. It can also be connected to the VCC or be fed by an external supply.

•

One internal regulator, which supplies the STDRIVE102BH/H control logic at 5 V. This voltage is for internal

use only: no external load or circuitry can be connected to the LGC_CAP pin, which must be used only to

connect an external decoupling capacitor (low-ESR ceramic, 4.7 µF / 16 V). This capacitor stabilizes all the

internal control circuits, including the power-on reset (POR).

•

A charge pump, supplied by VS and referenced to VM, which generates the VBOOT supply rail for the high

side gate drivers.

Figure 5. Power management block diagram

3.3V LDO

Charge

pump

AFE

VCC

VDD

VBOOT

Control

LOGIC

12V LDO

Internal 5V

Reg.

LGC_CAP

POR

REGIN_3V3

STDRIVE102BH, STDRIVE102H

Device description

DS14545 - Rev 1

page 15/56

STDRIVE102BH Datenblatt(PDF) 15 Page - STMicroelectronics