L9911

8/15

Figure 7. Phase Regulation Characteristics

PRINCIPLE OF PHASE REGULATION:

When VB+ is above the regulated voltage, the field driver is controlled to keep phase peak voltage from

falling below VPHH1.

If phase peak voltage drops below VPHL1, phase regulation does not work.

Figure 8. Application Diagram

Engine

Ign. Switch

W/Lamp

Ifield

F+/DFM

off

on

off

on

off

on

t_SL

t_ST

Field Pre-

excitation

Field

Regulation

Load ON

+

_

L9911

L

B+

F+

P

GND

DFM

to E.C.U.

+Vb / Vcc

ignition

switch

warning lamp

Field

Stator

C