LT1683 데이터 시트보기 (PDF) - Linear Technology
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LT1683 Datasheet PDF : 26 Pages
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LT1683
OPERATION
There is also an on-chip thermal shutdown circuit that will
turn off the outputs in the event the chip temperature rises
to dangerous levels. Thermal shutdown has hysteresis that
will cause a low frequency (<1kHz) oscillation to occur as
the chip heats up and cools down.
The chip has an undervoltage lockout feature that will
force the gate drivers low in the event that VIN drops below
2.5V. This ensures predictable behavior during start-up
and shutdown. SHDN can be used in conjuction with an
external resistor divider to completely disable the part if
the input voltage is too low. This can be used to ensure
adequate voltage to reliably run the converter. See the
section in Applications Information.
Table 1 summarizes these features.
Table 1. Safety and Protection Features
FEATURE
FUNCTION
Maximum Current Fault
Short-Circuit Fault
Overvoltage Fault
Turn Off FETs at Maximum
Switch Current (VSENSE = 0.1)
Turn Off FETs and Reset VC
for Short-Circuit (VSENSE = 0.2)
Turn Off Drivers If FB > VREG + 0.22V
(Output Overvoltage)
GCL Clamp
Set Max Gate Voltage to Prevent
FET Gate Breakdown
Gate Drive
Undervoltage Lockout
Disable Gate Drives When VIN
Is Too Low. Set Via GCL Pin
Thermal Shutdown
Turn Off Drivers If Chip
Temperature Is Too Hot
Opposite Gate Lockout
Prevents Opposite Driver from
Turning on Until Driver Is Off
(Cross Conduction in Transformer)
VIN Undervoltage Lockout
Disable Part When VIN ≅ 2.55V
Gate Drive Source and Sink Current Limit Limit Gate Drive Current
V5 Source/Sink Current Limit
Limit Current from V5
Shutdown
Disable Part When SHDN <1.3V
EFFECT ON GATE DRIVERS
Immediately Goes Low
Immediately Goes Low
Immediately Goes Low
Limits Max Voltage
Immediately Goes Low
Immediately Goes Low
Inhibits Turn On of
Opposite Driver
Immediately Goes Low
Limit Drive Current
None
SLEW CONTROL
Overridden
Overridden
Overridden
None
Overridden
Overridden
None
Overridden
None
None
EFFECT ON VC, SS
None
Discharge VC, SS
to GND
None
None
None
None
None
None
None
None
1683fd
12
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