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UC1637-SP Scheda tecnica(PDF) 4 Page - Texas Instruments

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Il numero della parte UC1637-SP
Spiegazioni elettronici  RAD-TOLERANT CLASS-V, SWITCHED MODE CONTROLLER FOR DC MOTOR DRIVE
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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UC1637-SP
SLUS950 – FEBRUARY 2010
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
over operating free-air temperature range, VS = 15 V, –VS = –15 V, +VTH = 5 V, –VTH = –5 V, RT = 16.7 kΩ, CT = 1500 pF,
TA = –55°C to 125°C = TJ (unless otherwise noted).
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT SECTION
ISINK = 20 mA
–14.9
–13
Output low level
V
ISINK = 100 mA
–14.5
–13
ISOURCE = 20 mA
13
13.5
Output high level
V
ISOURCE = 100 mA
12
13.5
Rise time
CL = 1 nF, TJ = 25°C
(4)
100
600
ns
Fall time
CL = 1 nF, TJ = 25°C
(4)
100
300
ns
(4)
Parameters ensured by design and/or characterization, if not production tested.
FUNCTIONAL DESCRIPTION
The following is a description of each of the functional blocks shown in the Functional Block Diagram.
Oscillator
The oscillator consists of two comparators, a charging and discharging current source, a current source set
terminal, ISET, and a flip-flop. The upper and lower threshold of the oscillator waveform is set externally by
applying a voltage at pins +VTH and -VTH respectively. The +VTH terminal voltage is buffered internally and also
applied to the ISET terminal to develop the capacitor charging current through RT. If RT is referenced to -VS as
shown in Figure 1, both the threshold voltage and charging current will vary proportionally to the supply
differential, and the oscillator frequency will remain constant. The triangle waveform oscillator's frequency and
voltage amplitude are determined by the exernal components using the formulas given in Figure 1.
Figure 1. Oscillator Setup
4
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