UNITRODE UC1726, UC2726, UC3726 Technical data
UC1726
UC2726
UC3726
查询UC1726供应商
Isolated Drive Transmitter
FEATURES
• 750mA Output Drive, Source or Sink
• 8 to 35V Operation
• Transmits Drive Logic and Power
through Low Cost Transformer
• Programmable Operating Frequency
• Up to 750kHz Operation
• Improved Output Control Algorithm
Minimizes Output Jitter
• Fault Logic Monitors Isolated High
Side IGBT Driver UC1727 for Faults
• User Programmable Fault Timing
Screens False Fault Signals
• Shutdown Mode Disables On Chip
Logic Reference for Low Standby
Power
• Optional External Biasing of Logic
Circuitry can Reduce Overall Power
Dissipation
BLOCK DIAGRA M
DESCRIPTION
The UC1726 Isolated Drive Transmitter, and its companion chip, the
UC1727 Isolated High Side IGBT Driver, provide a unique solution to driving isolated power IGBTs. They are particularly suited to drive the high
side device s on a high voltage H-bridge. The UC1726 device transmits
the drive logic and drive power, along with transferring and receiving fault
information with the isolated gate circuit using a low cost pulse transformer.
This drive system utilizes a duty cycle modulation technique that gives instantaneous response to the drive control transitions, and reliably passes
steady state, or DC conditions. High frequency operation, up to 750kHz,
allows the cost and size of the coupling transformer to be minimized.
The UC1726 can be powered from a single V
generates a vol tage reference for the logic circuitry. It can also be placed
into a low power shutdown mode that disables the internal reference. The
IC’s logic ci rcuitry can b e powered from an external suppl y, V
mize overall power dissipation. Fault logic monitors the Isolated High Side
IGBT Driver UC1727 for faults. Based on user defined timing, the
UC1726 distinguishes valid faults, which it responds to by setting the fault
latch pin. This also disables the gate drive information until the fault reset
pin is toggled to a logic one.
The UC1726 opera te s ove r an 8 to 3 5 vo lt su ppl y range. The typical V
voltage will be greater than 28 volts to be compatible with the UC1727.
The undervoltage lockout circuitry of the Isolated High Side IGBT Driver
UC1727 locks out the driv e information during its undervoltage lockout.
CC supply whi ch internally
L, to mini-
CC
7/95
UDG-94004-1
UC1726
UC2726
UC3726
ABSOLUTE MAXI MUM RATING S
Supply Voltage VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Source/ Sink Current (Pulsed). . . . . . . . . . . . . . . . . . . . . . 1.5A
Source/ S in k Curr ent (Continuous) . . . . . . . . . . . . . . . . . . 1.0A
Output Voltag e (pins 12, 14). . . . . . . . . . −0.3 to (V
C
F, FRESET, FAULT, SHTDWN,
F
LATCH, VL, PHI, RT . . . . . . . . . . . . . . . . . . . . . . . −0.3 to 6. 0V
C
T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 6.0V
CC + 0.3)V
Operating Junct ion Te mp era tu re (Not e 2) . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . . −65°C to 150°C
Lead Temp era ture (Solder in g, 10 seco nds). . . . . . . . . 300°C
Note 1: All voltages are with respect to GND ( Pin 2); al l
currents are posit ive int o, negat ive ou t of part .
CONNECTION DIAGRAMS
DIL-16 (Top View)
N Package
DIL-16 (Top View)
SP Package
RECOMMENDED OPERATING CONDITIONS (Note 3)
Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +9 to +35.0V
Sink/Source Curre nt (each out put ). . . . . . . . . . . . . . . 0 to 750mA
Timing Resistor. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4k to 200kΩ
Timing Capacitor (C
Timing Capacitor (C
Note 2: See Unitrod e Inte gra ted C ircuit s data b ook for infor mat ion
regarding thermal spe cifica tion s and limit ations of
packages.
Note 3: Range over which the device is functional and par amet er
limits are guaranteed.
T). . . . . . . . . . . . . . . . . . . . . . . 75pF to 2.0nF
F). . . . . . . . . . . . . . . . . . . . . . . 75pF to 3.0nF
DIL-18 (Top View)
J Package
SOIC-28 (Top View)
DWP Package
PLCC-28 (Top View)
QP Package
2
PACKAGE PIN FUNCTION
FUNCTION PIN
GND 1
T 2
C
N/C 3-4
T 5
R
SHTDWN 6
L 7
V
CC 8
V
N/C 9
CC 10
PV
OUTB 11
PGND 12-18
GND 19
OUTA 20
PHI 21
LATCH 22
F
RESET 23
F
FAULT 24
N/C 2 5
F 26
C
N/C 2 7
N/C 2 8
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