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PDF IR3220S Data sheet ( Hoja de datos )
| Número de pieza | IR3220S | |
| Descripción | FULLY PROTECTED H-BRIDGE | |
| Fabricantes | International Rectifier | |
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Data Sheet No.PD60180-C
IR3220S
FULLY PROTECTED H-BRIDGE FOR D.C. MOTOR
www.DataSheet4U.com The IR3220S is a fully protected dual high side switch I.C that
integrates an H–bridge motor controller with two very efficient
high side MOSFETs in a single 20-pin package. The IR3220S
combines with the two low side IRF7484Q MOSFETs as few as
10 external passive components to provide a complete, fully op-
erational and fully protected H-bridge control actuator with for-
ward, reverse, braking and non-braking modes without the need
of a micro-controller.
Functional Description
The high side switches provide the direction capability and the H-
bridge protection. The low side MOSFETs bring the flexibility by
offering the high frequency switching ability. Therefore, crude
start-up of the motor is avoided and replaced by a smooth and
stress-less speed ramp-up.
The IR3220S features shoot-through protection for each leg, H-
bridge logic control, soft-start sequence and over-current / over-
temperature shutdown protections. Two input signals (IN1 & IN2)
select the operating modes while the PWM soft-start sequence
cycles the corresponding active low side MOSFET in order to
limit the motor in-rush current. The soft-start sequence is pro-
grammed by an RC time constant and reset itself automatically.
Thanks to the inner PWM oscillator, the IR3220S can also be
the final stage of an overall torque or speed loop. If needed, an
external clock may force the H-bridge switching operation. This
can be combined with low frequency PWM operation through
the IN1(2) inputs.
The IR3220S is a Co-pack IPS product offering very low Rds(on)
and a high level of functionality and protection. Its open architec-
ture and programmability helps the designer to optimize each
motor drive upon the application requirements at a very low cost.
For automotive actuators, the motor is kept shorted even during
the low consumption sleep mode. Shoot-through protection, over-
temperature & over-current shutdowns, self-adaptive dead-time
and PWM circuitries are described in details in the AN 1032
Application Note. A general purpose method to help rating the
soft-start sequence as well as layout and thermal considerations
are also covered. Finally, a 6A DC motor actuator with a PCB
size down to 1 Inch² is suggested in the document.
Features
Programmable PWM In-rush
Current Limitation (e.g 18A)
6 A Continuous Current Capability
without Heat Sink (2 x 13 mΩ)
Over-Temperature (165 °C) and
Over-Current (30A) Protections
20 kHz PWM Oscillator Embedded
Low & High Frequency Switching
Operation (self adaptive dead-time)
Easy Speed / Torque Control
(analog duty cycle input)
Braking / Non-Braking Modes
Sleep Mode (braking) for
Automotive Actuator
Packages
8-Lead SOIC
IRF7484Q
20-Lead SOIC
(wide body)
www.irf.com
1
1 page  
IR3220S
The PWM generator is based on a 3V saw-tooth oscillator. The soft-start sequence takes advantage of the RC
charge profile in order to perform a smooth duty cycle variation. When the SS pin is below 1.2V, no PWM signal
is sent to the low side MOSFETs. When it exceeds 4.2V, they are permanently ON. By designing the proper RC
www.DataSheet4U.com network, the start-up can either be very slow without any in-rush current or, fast and efficient by shortening the
PWM sequence. In addition to the quiescent braking mode, the IR 3220S is able to open the four MOSFETs
simultaneously if the mechanical load requires its natural slow-down (stand-by mode without braking). The
four modes and their corresponding DC motor current profiles are summarized in the Timing Diagram.
Over-load protection is achieved thanks to the I.C temperature shutdown protection. By using the recom-
mended part number and the proper cooling, the whole H-bridge is protected by the IR 3220S’s inner over-
temperature circuitry (see AN 1032). A micro-controller is able to directly drive the PWM duty cycle by forcing
a 0 to 5V voltage on the SS pin (e.g. through a 10K resistor). Thus, closing a speed or torque control loop for
advanced applications becomes very easy. Since the low side MOSFETs are the only ones switching, the
IR 3220S body diodes offer the freewheeling path to the motor. The power dissipated in each body diode while
switching may appear high enough to trip the over-temperature protection. For permanent switching operation,
external Schottky diodes should be implemented between each output (M1 & M2) and the VCC pin.
Permanent Switching Operation
(without external RC time constant)
+5V
Additional Schottky diodes
have to be implemented if
the I.C temperature appears
too high.
Micro Vcc Diagnostic
Controller
Direction &
Braking
A over-voltage protection
may be needed depending
on the power supply wire
Speed
Gnd
length
0V
Additional
Schottky diodes
Dg
In1
In2
IR 3220S
ss
IRF 7484
Star Connection
IRF 7484
Over-voltage
protection
+Bat
DC Motor
-Bat
Copper plates added to the footprints will improve the cooling.
However, the low side MOSFETs should always remain colder
and thermally independent from the IR 3220S. The power path
has to be designed carefully and shall include both a decoupling
capacitor (e.g. 100 nF ceramic) and a reservoir capacitor (e.g.
Cres ( uF). = I pk soft-start (A) x 25). The window-lifter is a
good example where the IR 3220S’s PWM ability greatly en-
hances the application. The current is monitored thanks to a
shunt and sent back to the micro-controller which takes over
the torque control loop (anti-pinch function).
WWW.IRF.COM
5
5 Page 
IR3220S
www.DataSheet4U.com IN1 (2)
T clamp
I M1(2)
M1(2)
0V
( + Vcc )
V clamp
( see IPS Appl . Notes to evaluate power dissipation )
Figure 1 - Active clamp waveforms
5V
IN1 (2) 0 V
I M1(2)
Tj Tsd
DG 5 V
0V
t < T reset
I shutdown
t > T reset
T shutdown
Figure 2 - Protection Timing diagram
IN 1(2)
Vcc
90%
Vcc - 5 V
M1 (2)
10%
Td on
dV/dt on
Tr 1
Tr 2
Figure 3 - Switching Time Definitions (turn-on)
IN1(2)
90%
M1(2)
10%
Td off
dV/dt off
Tf
Figure 4 - Switching Time Definitions (turn-off)
WWW.IRF.COM
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet IR3220S.PDF ] | |
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