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UC3727 の電気的特性と機能

UC3727のメーカーはUnitrodeです、この部品の機能は「Isolated High Side IGBT Driver」です。


製品の詳細 ( Datasheet PDF )

部品番号 UC3727
部品説明 Isolated High Side IGBT Driver
メーカ Unitrode
ロゴ Unitrode ロゴ 




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UC3727 Datasheet, UC3727 PDF,ピン配置, 機能
Isolated High Side IGBT Driver
UC1727
UC2727
UC3727
FEATURES
Receives Power and Signal from Single
Isolation Transformer
Generates Split Rail for 4A Peak Bipolar
Gate Drive
16V High Level Gate Drive
Low Level Gate Drive more Negative
than -5V
Undervoltage Lockout
Desaturation Detection and Fault
Processing
Separate Output Enable Input
Programmable Stepped Gate Drive for
Soft Turn On
Programmable Stepped Gate Drive for
Soft Fault
DESCRIPTION
The UC1727 and its companion chip, the UC1726, provide all the
necessary features to drive an isolated IGBT transistor from a TTL in-
put signal. A unique modulation scheme is used to transmit both
power and signal across an isolation boundary with a minimum of ex-
ternal components.
Protection features include under voltage lockout and desaturation
detection. High level gate drive signals are typically 16V. Intermediate
high drive levels can be programmed for various periods of time to
limit surge current at turn on and in the event of desaturation due to a
short circuit.
The chip generates a bipolar supply so that the gate can be driven to
a negative voltage insuring the IGBT remains off in the presence of
high common mode slew rates.
Uses include isolated off-line full bridge and half bridge drives for mo-
tors, switches, and any other load requiring full electrical isolation.
BLOCK DIAGRAM
12/94
UDG-94005-2

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UC3727 pdf, ピン配列
UC1727
UC2727
UC3727
See Application Note U-143A "New Chip Pair Provides Isolated Drive for High Voltage IGBTs"
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.
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.
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.
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 1µF capacitor.
VEE: Negative supply voltage. Bypass to COM with a low
ESL/ESR 1µF capacitor.
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.
PVEE: Output driver negative supply. Connect to VEE
with a 3.3 ohm resistor and bypass to COM with a low
ESL/ESR 1µF capacitor.
PVCC: Output driver positive supply. Connect to VCC with
a 3.3 ohm resistor and bypass to COM with a low
ESL/ESR 1µF capacitor.
ELECTRICAL CHARACTERISTICS: 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.
PARAMETER
Power Input Receivers
Forward Diode Drop
VCC Regulator
VCC
Hysteresis Comparator
Input Open Circuit Voltage
Input Impedance
Hysteresis
Enable Input
High Level Input Voltage
Low Level Input Voltage
Input Bias Current
Output Driver
Saturation to VCC
Saturation to VCC
Saturation to VEE
Saturation to VEE
TEST CONDITIONS
IF = 50mA
IF = 500mA
25 (VCC - VEE) 36V,I(COM) ≤ 15mA
(Measured with respect to VEE)
ENBL = COM
I(OUT) = -20mA
I(OUT) = -500mA
I(OUT) = 20mA
I(OUT) = 500mA
MIN TYP MAX UNITS
0.5 0.65
1.2 2
V
V
15.5 16.5 17.5 V
12
100
44 47 50
V
k
V
12 V
5V
460 900 µA
1.7 2.3
2 2.5
23
2.4 3.6
V
V
V
V
3


3Pages


UC3727 電子部品, 半導体
UC1727
UC2727
UC3727
EXTERNAL BIPOLAR SUPPLIES
If it is desired to drive an emitter grounded IGBT from ex-
ternal supplies, the configuration in Figure 8 should be
used. COM should never be connected to ground. VCC
must be 12V and VCC-VEE must be 23.5V.
Figure 6. Desaturation Response
ENABLE
ENBL provides an alternate means of controlling the out-
put. If ENBL is used as the primary input, B must be con-
nected to VCC and A to VEE. ENBL can be driven by the
output of an optoisolator from ENBL to COM as shown in
Figure 7. If ENBL is not used, it should be connected to
COM.
Figure 8. Using External Supplies
Figure 7. Using ENBL as Primary Input
UNITRODE INTEGRATED CIRCUITS
7 CONTINENTAL BLVD. MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
Figure 9. Input to Output Delay
6

6 Page



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共有リンク

Link :


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