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UC3172A датащи(PDF) 6 Page - Texas Instruments

номер детали UC3172A
подробное описание детали  Full Bridge Power Amplifier
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC3172A датащи(HTML) 6 Page - Texas Instruments

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VPARK: The auxiliary inverting input to the A amplifier,
activated during park conditions on the UC3172A. An in-
ternal auxiliary non-inverting input is connected to the
1.3V reference. When the auxiliary inputs are activated,
the A amplifier will force a programmed voltage at its out-
put for a maximum back-EMF/velocity retract of the
head. The park condition on the UC3172A is always acti-
vated by any one of the following four conditions, 1: a low
condition on either of the UV inputs, 2: a high input level
at the PARK input, 3: a UVLO condition at the VL supply
pin, and 4: activation of the TSD (thermal shutdown) pro-
tection circuit. During a UVLO condition at the VL pin the
auxiliary inputs to the A amplifier are over-ridden, and the
A amplifier output is forced to its high state.
UV1 & 2: Inputs to the UV comparator, these inputs are
high impedance sensing points used to monitor external
supply conditions. Either of the inputs going low will force
the device into a park condition, and force the PWROK
output to an active low state. If either of these inputs is
not used it should be connected to a voltage greater than
1.3V.
APPLICATION INFORMATION
PIN DESCRIPTIONS (cont.)
UC3172A
0
0.1
0.2
0.3
0
500
100
600
200
700
300
800
400
900 1000
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0°C
0°C
25°C
25°C
125°C
125°C
LOW-SIDE
HIGH-SIDE
Output Current (mA)
A and B Amplifier High and Low Vsats
0.6
0
500
100
600
200
700
300
800
400
900 1000
0.8
1.0
1.2
1.4
1.6
1.8
0°C
25°C
125°C
Output Current (mA)
A and B Amplifier Total Vsat
0
0.2
0
50
100
150
200
0.4
0.6
0.8
1
0°C
25°C
125°C
A or B Amplifier High-Side Vsat Increase (mVolts)
I=
450mA
OUT
VIN to VC Headroom
0
0.1
0
5
10
15
20
0.2
0.3
0.4
0.5
0°C
25°C
125°C
Power OK Output Current (mA)
PWROK Saturation Voltage
6


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