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SA303-IHZ Fiches technique(PDF) 6 Page - Cirrus Logic

No de pièce SA303-IHZ
Description  3 Phase Switching Amplifier
Download  14 Pages
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Fabricant  CIRRUS [Cirrus Logic]
Site Internet  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

SA303-IHZ Fiches technique(HTML) 6 Page - Cirrus Logic

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SA303
6
SA303U
P r o d u c t I n n o v a t i o n F r o m
Pin#
PinName
SignalType
Simplified Pin Description
9
SGND
Power
Analog and digital GND – internally connected to PGND
11
Bt
Logic Input
Logic high commands B phase upper FET to turn on
13
Bb
Logic Input
Logic high commands B phase lower FET to turn on
15
Ab
Logic Input
Logic high commands A phase lower FET to turn on
17
At
Logic Input
Logic high commands A phase upper FET to turn on
19
V
DD
Power
Logic Supply (5V)
21
Ia
Analog Output
Phase A current sense output
23
DIS2
Logic Input
Logic high places all outputs in a high impedance state
25
TEMP
Logic Output
Thermal indication of die temperature above 135ºC
42,43,44
OUT B
Power Output
Half bridge b Power Output
46,47,48,49 V
S (phase B&C)
Power
High Voltage Supply phase b&C
33,34,35
OUT A
Power Output
Half bridge A Power Output
37,38,39,40 PGND (phase A&b) Power
High Current GND Return Path for Power Outputs A&b
26,27,58,59 HS
Mechanical
Pins connected to the package heat slug
2,4,6,8,10,
12,14,16,18,
20,22,24,28,
32,36,41,45,
50,54,60,62,
64
NC
---
Do Not Connect
.2PinDescriptions
V
S: Supply voltage for the output transistors. These pins require decoupling (1μF capacitor with good high frequen-
cy characteristics is recommended) to the PGND pins. The decoupling capacitor should be located as close to
the V
S and PGND pins as possible. Additional capacitance will be required at the VS pins to handle load cur-
rent peaks and potential motor regeneration. Refer to the applications section of this datasheet for additional
discussion regarding bypass capacitor selection. Note that V
S pins 29-31 carry only the phase A supply current.
Pins 46-49 carry supply current for phases b & C. Phase A may be operated at a different supply voltage from
phases B & C. Both V
S voltages are monitored for undervoltage conditions.
OUTA,OUTB,OUTC: These pins are the power output connections to the load. NOTE: When driving an induc-
tive load, it is recommended that two Schottky diodes with good switching characteristics (fast t
RR specs) be
connected to each pin so that they are in parallel with the parasitic back-body diodes of the output FETs. (See
Section 2.6)
PgND:Power Ground. This is the ground return connection for the output FETs. Return current from the load flows
through these pins. PGND is internally connected to SGND through a resistance of a few ohms. See section
2.1 of this datasheet for more details.
SC:Short Circuit output. If a condition is detected on any output which is not in accordance with the input com-
mands, this indicates a short circuit condition and the SC pin goes high. The SC signal is blanked for approxi-
mately 200ns during switching transitions but in high current applications, short glitches may appear on the
SC pin. A high state on the SC output will not automatically disable the device. The SC pin includes an internal
12kΩ series resistor.
Ab,Bb,Cb:These Schmitt triggered logic level inputs are responsible for turning the associated bottom, or lower
N-channel output FETs on and off. Logic high turns the bottom N-channel FET on, and a logic low turns the low
side N-channel FET off. If Ab, bb, or Cb is high at the same time that a corresponding At, bt, or Ct input is high,
protection circuitry will turn off both FETs in order to prevent shoot-through on that output phase. Protection
circuitry also includes a dead-time generator, which inserts dead time in the outputs in the case of simultane-
ous switching of the top and bottom input signals.
TABLE.PINDESCRIPTIONS-Cont.


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