IRS26320JPbF – High-Voltage 3-Phase Gate Driver IC with DC Bus Over-voltage Protection and Emergency Supply Backup
HVIC / MOTOR CONTROL
IRS26320JPbF Functional Block Diagram
DC+ bus
V
SS
DCbusSense
Emergency Supply
V
CC
Backup
V
CC
High-Side Input (x3)
DC Bus Sense
Comparator Input and Filter
IRS26320JPbF
THE POWER MANAGEMENT LEADER
Schmitt-Trigger Inputs,
Noise Filter and
Shoot-through Protection
Logic
Backup
Bias
Supply
600V 3-Phase Gate Drive IC
with UVLO Protection
High-Voltage 3-Phase Gate Driver IC with DC Bus
Over-Voltage Protection and Emergency Supply Backup
Typical Connection Diagram
Summary
HV Well
V
CC
V
B
: High-Side
Power Supply (x3)
High-Side
Output (x3)
V
OUT
I
O
& I
O
- (typical)
t
ON
& t
OFF
(typical)
Deadtime (typical)
Package
12V - 20V
200mA & 350mA
530ns & 530ns
290ns
RC
IN
I
TRIP
V
SS
HV Drive Stage
Delay
Low-Side
Output (x3)
COM
Features
To Low-Side
Power Switches (x3)
• Gate drive supplies up to 20 V per channel
• Emergency supply backup in case of V
CC
loss
• DC bus sensing with over-voltage protection
• Over-current protection
Higher Efficiency
Modern washer manufacturers require state-of-the-art electronic components to deliver
more sophisticated features to the end user. The aim is to create a machine that can wash
almost all types of fabric with minimum energy, in less time and using less detergent than
previous models – without increasing the overall system cost.
Furthermore, government regulations are becoming more and more stringent in terms of
efficiency and safety. In the near future, a new energy labeling scheme may be introduced
in Europe – and the only way to achieve the highest class label will be to equip the washer
with a three-phase permanent magnet (PM) motor.
The IRS26320JPbF from International Rectifier is a high-voltage, high speed power
MOSFET and IGBT driver with three independent high- and low-side referenced output
channels for three-phase inverters driving PM motors in washers. The motor is enabled to
deliver high torque at low speed (during washing) and reach high speed with low torque
demand (during spinning). This highly accurate torque and speed control delivers an
efficient washing cycle while reducing the motor flux to enable a high spinning speed that
helps deliver a more efficient drying function in compliance with safety regulations.
Two extreme point control
Field weakening operation
(Reduce flux to keep voltage from saturation)
LV Drive Stage
General Purpose
Comparator Input & Filter
• Over-temperature shutdown input
• Advanced input filter
• Integrated deadtime protection
• Shoot-through (cross-conduction) protection
• Under-voltage lockout for V
CC
and V
BS
• Enable/disable input and fault reporting
IC detects overcurrent
and performs shutdown
IRS26320JPbF Typical Application Connection
+
DC
BUS
• Adjustable fault clear timing
• Separate logic and power grounds
• 3.3V input logic compatible
Input
Voltage
DC
BUS
Sense
To
Load
• Tolerant to repetitive negative
Vs transient voltage
• Designed for use with bootstrap
power supplies
• Matched propagation delays for all channels
• -40˚C to 125˚C operating range
Drum Torque
30Nm
–
DC
BUS
V
CC
• RoHS compliant
IRS26320J
Typical Applications
• Permanent magnet motor drives
for appliances
• Industrial drives
5Nm
Control Inputs, EN
For further information please contact your local Farnell office or visit the web at: www.farnell.com
10208FS
• Micro inverter drives
For further information please contact your local Farnell office or visit the web at: www.farnell.com
DNG
• Drives up to six IGBT/MOSFET power devices
Spin: Low torque high speed
1800rpm
Speed
MOC
3,2,1 OL
PIRT
I
FAULT/EN
Logic
44-lead PLCC
ss
V
V
S
: High-Side
Return (x3)
NI
CR
HV Level
Shifters
To High-Side
Power Switches (x3)
IRS26320JPbF
10208FS
daoL
oT
esneSsuBCD
3,2,1S
V
3,2,1
Low-Side Input (x3)
3,2,1B
V
+suB CD
NE/TLUAF
3,2,1NIL
3,2,1NIH
ccV
SS
V
NE/TLUAF
3,2,1NIL
3,2,1NIH
ccV
Wash cycle: High torque low speed
V
OFFSET
≤
600V
V006 ot pU
Topology
3-Phase
IRS26320JPbF – High-Voltage 3-Phase Gate Driver IC with DC Bus Over-voltage Protection and Emergency Supply Backup
DC + BUS
D
BS
V
CC
V
B
(x3)
C
BS
R
G
, HO
Control is lost: DC
BUS
voltage rises quickly due
to voltage regeneration.
0
0
-10
100
200
300
Time (ns)
400
500
600
700
800
900
1000
HO
(x3)
DC
BUS
Sense
V
S (x3)
LO
(x3)
COM
V
SS
OFF
V
S1
R
G
, LO
OFF
V
S2
OFF
V
S3
IRS26320
Tested safe operating area
V
BUS
> V
TH, BUS
IRS26320JPbF brakes the motor by shorting the motor
terminal and avoiding excessive over-voltage
-20
-30
V
I
(V)
I
TRIP
ON
ON
ON
-40
-50
-60
-70
-80
-90
Phase Current
R
SHUNT
IRS26320JPbF Safe
Operating Area under
repetitive negative spikes
DC – BUS
DC Bus over-voltage protection scheme in IRS26302J
Greater Safety
Safety regulations enforced by law require that every appliance
must meet precise international rules. Every appliance must
include safety protection circuits either in hardware or in software
that avoid hazards to the end user in case of failure of any of the
components in the machine. By law, every circuit that implements
a protective function must be certified by an internationally
recognized institute.
Washers equipped with PM motors present a new challenge to
washer manufacturers, because, while in spinning mode, the motor
itself can become dangerous in the event that control is lost. To
reach the necessary high speed during spinning, the motor must be
de-fluxed in real-time fashion. This artificial de-fluxing prevents the
motor from generating a significant voltage.
Problems arise if, in the event of controller failure, the motor
is left rotating without controlling the applied voltage to it. The
motor will then act as a dynamo, generating a high voltage
(above 1000V) that can create a fire hazard in the electronics.
The IRS26320JPbF from International Rectifier has been
designed with a specific hardware safety function that can
override the controller commands and brake the PM motor
(by shorting its terminals) until a safe low speed is reached,
thus avoiding high-voltage generation. The IRS26320JPbF
continuously senses the DC Bus through an external resistor
divider and, if a critical voltage is reached, the IRS26320JPbF
successfully brakes the motor by shorting the terminal through
low-side switches.
Competing solutions require an added external circuit to
perform the same function as the IRS26320JPbF. This function is
mandatory because it is required for safety purposes. Another
important feature of the IRS26320JPbF is an emergency supply
backup in case of Vcc loss. If the application power supply
fails during field weakening operation, the Vcc may disappear
leaving the inverter totally uncontrolled. This can be a serious
fire hazard. The IRS26320JPbF includes a unique emergency
backup circuitry that can self-bias the HVIC from the DC Bus
and engage a Zero Vector Brake function to coast stop the
motor safely. The IRS26320JPbF also embeds other important
protection features that are used for safety reasons: anti-shoot
through, over-current protection, under-voltage lockout and
thermal shutdown input.
Increased Reliability
The IRS26320JPbF from International Rectifier is part of the
company’s latest family of gate drivers designed to be the most
rugged in the market for hard switching environments such
as motor control circuits. A typical problem in voltage source
inverters with inductive loads (as in the motor control domain)
is that the hard switching generates negative voltage spikes
whose amplitude and duration depend on the switches and on
the layout of the application PCB. Each of these spikes occurs
at PWM frequency, so in some operating conditions, they can
occur 16000 times per second. In the IRS26320JPbF datasheet,
the Safe Operating Area for this HVIC under these conditions
is specified.
+V
BUS
LD2
HO
Q2
Control IC
LS2
V
S
LD1
V
S
-COM
COM
LO
Q1
-V
S
LS1
Load Return
t
To Load
Overall Benefits
• Reduced component count because the high-voltage
clamping diodes used in other solutions are no longer
necessary
• Fewer field returns because the robust IR HVIC does not fail
in an unpredictable manner unlike other solutions
Input filters have been re-designed to avoid small pulse
commands reaching the gates of the switches in the inverter.
This is one of the sources of problems in the field and usually
it is difficult to detect. The typical effect is that sometimes
inverters return from the field damaged with one destroyed
leg without an apparent root cause. The IRS26320JPbF embeds
filters that solve this issue.
Advanced Input Filtering in IRS26320J
In addition to improved filtering techniques, the IRS26320PbF
also guarantees outstanding matching in propagation time on all
channels as well as dead-time automatically inserted when external
dead-time is lower than a minimum safe limit.
Cost-effectiveness
While including all features in the design of the new rugged
family of motion gate drivers, International Rectifier considered
the overall system cost requirements of its customers.
Therefore, the IRS26320JPbF includes many features that
are required in modern applications while keeping external
component count to a minimum. With fewer components and
field returns, the overall system cost is lower.
EXAMPLE 1
IN
OUT
t
FIL,IN
IN
OUT
Small pulses to the gate of the
switches may cause inverter damage
t
FIL,IN
EXAMPLE 2
IN
OUT
t
FIL,IN
IN
OUT
t
FIL,IN
V
BUS
V
S
Undershoot
COMPETITOR’S HVIC
MT
MDT
PM
T
ON
, T
OFF
matching time (on all six channels)
DT matching (HIN ->LO & LO->HIN on all channels)
Pulse width distortion
IRS26320 HVIC
50ns Max
60ns Max
75ns Max
Tolerant to negative transient voltage
Outstanding deadtime and delay matching in IRS26320J along with low pulse width distortion
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