INT201PF1 View Datasheet(PDF) - Power Integrations, Inc

Part Name

Description

Manufacturer

INT201PF1

High-side Driver IC Floating Inputs Floating High-side Drive

Power Integrations, Inc 

INT201

HV+

C2

D1

VDD

8

76

5

INT201

1

23

4

8

76

5

R2

Q2

PHASE 1

PHASE 2

HS IN

LS IN

C1

INT200

1

23

4

R1

Q1

3-PHASE

BRUSHLESS

DC MOTOR

PHASE 3

HV-

Figure 4. Using the INT200 and INT201 in a 3-phase Configuration.

General Circuit Operation

PI-1467-042695

One phase of a three-phase brushless

DC motor drive circuit is shown in Figure

4 to illustrate an application of the

INT200/201. The LS IN signal directly

controls MOSFET Q1. The HS IN signal

causes the INT200 to command the

INT201 to turn MOSFET Q2 on or off as

required. The INT200 will ignore input

signals that would command both Q1

and Q2 to conduct simultaneously,

protecting against shorting the HV+ bus

to HV-.

The INT201 is latched on and off by the undervoltage lockout threshold.

edges of the appropriate low-side logic Undervoltage lockout-induced turn off

signal (HS IN for the INT200 and HS IN

can occur during conditions such as

for the INT202). The high-side driver power ramp up, motor start, or low speed

will latch off and stay off if the bootstrap operation.

capacitor discharges below the

CBOOTSTRAP vs. ON TIME

1000

100

Local bypassing for the low-side driver

is provided by C1. Bootstrap bias for the

high-side driver is provided by D1 and

C2. Slew rate and effects of parasitic

oscillations in the load waveforms are

controlled by resistors R1 and R2.

The inputs are designed to be compatible

with 5 V CMOS logic levels and should

not be connected to V . Normal CMOS

DD

power supply sequencing should be

observed. The order of signal application

should be V , logic signals, and then

DD

HV+.

10

QG = 100 nC

1

QG = 20 nC

0.1

0.01

0.01 0.1

1

10

100

High Side ON Time (ms)

Figure 5. High-side On Time versus Bootstrap Capacitor.

3 F

2/96

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