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UC1727 Scheda tecnica(PDF) 3 Page - Texas Instruments

Il numero della parte UC1727
Spiegazioni elettronici  Isolated High Side IGBT Driver
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
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ELECTRICAL CHARACTERISTICS:
PIN DESCRIPTIONS
A, B: Signal and power input pins. Connect these pins to
the secondary of the transformer driven by UC1726.
CLAMP: Analog programming pin for intermediate drive
level to be used at turn on or in response to a desatura-
tion event. Requires a bypass capacitor to COM.
COM:
Self generated common for bipolar supply. This
pin will be 16.5V below PVCC.
DSAT+, DSAT-: Inputs to the desaturation comparator. De-
saturation is detected when DSAT+ is greater than DSAT-.
ENBL: Negative true enable input. Tie to VCC to disable
the chip. Connect to COM to enable the chip. If the ENBL
pin is used as the primary input to the chip, connect B to
VCC and A to VEE.
FRC: Fault Resistor and Capacitor. Programs the dura-
tion that OUT will be held at CLAMP potential during a de-
saturation event before it is driven fully low. Also sets the
period of time that OUT will be held low before allowing it
to be driven high again.
FRPLY: Fault Reply pin. Open collector output. Normally
connected to VEE. When desaturation is detected, the pin
opens.
OUT: Gate drive output. Connect to gate of IGBT with a
series damping resistor greater than 3 ohms.
TRC: Timing Resistor and Capacitor. Programs the dura-
tion that OUT will be held at CLAMP potential and the pe-
riod of time the desaturation comparator will be ignored
during the rising edge.
VCC: Positive supply voltage. Bypass to COM with a low
ESL/ESR 1
µF capacitor.
VEE: Negative supply voltage. Bypass to COM with a low
ESL/ESR 1
µF capacitor.
PVEE:
Output driver negative supply. Connect to VEE
with a 3.3 ohm resistor and bypass to COM with a low
ESL/ESR 1
µF capacitor.
PVCC: Output driver positive supply. Connect to VCC with
a 3.3 ohm resistor and bypass to COM with a low
ESL/ESR 1
µF capacitor.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Power Input Receivers
Forward Diode Drop
IF = 50mA
0.5
0.65
V
IF = 500mA
1.2
2
V
VCC Regulator
VCC
25
≤ (VCC - VEE) ≤ 36V,I(COM) ≤ 15mA
15.5
16.5
17.5
V
Hysteresis Comparator
Input Open Circuit Voltage
(Measured with respect to VEE)12
V
Input Impedance
100
k
Hysteresis
44
47
50
V
Enable Input
High Level Input Voltage
12
V
Low Level Input Voltage
5V
Input Bias Current
ENBL = COM
−460
−900
µA
Output Driver
Saturation to VCC
I(OUT) = -20mA
1.7
2.3
V
Saturation to VCC
I(OUT) = -500mA
2
2.5
V
Saturation to VEE
I(OUT) = 20mA
2
3
V
Saturation to VEE
I(OUT) = 500mA
2.4
3.6
V
Unless otherwise stated, these specifications apply for TA =
−55°C to 125°C for the
UC1727, TA =
−40°C to 85°C for the UC2727, TA = 0°C to 70°C for the UC3727,
R(TRC) = 54.9k, C(TRC) = 180pF, R(FRC) = 309K, C(FRC) = 200pF, VCC - VEE =
25V, CLAMP = 9V, TA = TJ, and all voltages are measured with respect to COM.
UC1727
UC2727
UC3727
See Application Note U-143A "New Chip Pair Provides Isolated Drive for High Voltage IGBTs"
3


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