Texas Instruments UC3726DWPTR, UC3726DWP, UC3726N, UC2726N, UC2726DWPTR Datasheet
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• 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
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
CC supply whi ch internally
generates a voltage 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
L, to mini-
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
CC
voltage will be greater than 28 volts t o be compatible with the UC1727.
The undervoltage lockout circuitry of the Isolated High Side IGBT Driver
UC1727 locks out the drive information during its under voltage lockout.
Isolated Drive Transmitter
FEATURES
DESCRIPTION
BLOCK DIAGRA M
UC1726
UC2726
UC3726
7/95
UDG-94004-1
CONNECTION DIAGRAMS
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
CC + 0.3)V
C
F, FRESET, FAULT, SHTDWN,
F
LATCH, VL, PHI, RT . . . . . . . . . . . . . . . . . . . . . . . −0.3 to 6. 0V
C
T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0 to 6.0V
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 seconds). . . . . . . . . 300 °C
Note 1: All voltages are with res pect to GND ( Pin 2); all
currents are posit ive int o, negat ive ou t of part .
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
T). . . . . . . . . . . . . . . . . . . . . . . 75pF to 2.0nF
Timing Capacitor (C
F). . . . . . . . . . . . . . . . . . . . . . . 75pF to 3.0nF
Note 2: See Unitrod e Inte gra ted C ircuit s datab ook f or inform at 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.
RECOMMENDED OPERATING CONDITIONS (Note 3)
DIL-16 (Top View)
N Package
DIL-16 (Top View)
SP Package
DIL-18 (Top View)
J Package
SOIC-28 (Top View)
DWP Package
PACKAGE PIN FUNCTION
FUNCTION PIN
GND 1
C
T 2
N/C 3-4
R
T 5
SHTDWN 6
V
L 7
V
CC 8
N/C 9
PV
CC 10
OUTB 11
PGND 12-18
GND 19
OUTA 20
PHI 21
F
LATCH 22
F
RESET 23
FAULT 24
N/C 2 5
C
F 26
N/C 2 7
N/C 2 8
PLCC-28 (Top View)
QP Package
2
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