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参数资料
| 型号： | LTC3803MPS6-3#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 1 MM HEIGHT, PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 15/16页 |
| 文件大小： | 170K |
| 代理商： | LTC3803MPS6-3#TR |
LTC3803-3
8
38033fd
OPERATION
The undervoltage lockout (UVLO) mechanism prevents
the LTC3803-3 from trying to drive a MOSFET with in-
sufcient VGS. The voltage at the VCC pin must exceed
VTURNON (nominally 8.7V) at least momentarily to enable
LTC3803-3 operation. The VCC voltage is then allowed
to fall to VTURNOFF (nominally 5.7V) before undervoltage
lockout disables the LTC3803-3. This wide UVLO hysteresis
range supports the use of a bias winding on the yback
transformer to power the LTC3803-3—see the section
Powering the LTC3803-3.
The ITH/RUN pin can be driven below the shutdown
threshold (VITHSHDN) to force the LTC3803-3 into shut-
down. An internal 0.3μA current source always tries to
pull this pin towards VCC. When the ITH/RUN pin voltage
is allowed to exceed VITHSHDN, and VCC exceeds VTURNON,
the LTC3803-3 begins to operate and an internal clamp
immediately pulls the ITH/RUN pin up to about 0.7V. In
operation, the ITH/RUN pin voltage will vary from roughly
0.7V to 1.9V to represent current comparator thresholds
from zero to maximum.
Internal Soft-Start
An internal soft-start feature is enabled whenever the
LTC3803-3 comes out of shutdown. Specically, the ITH/
RUN voltage is clamped and is prevented from reaching
maximum until roughly 1.4ms has passed. This allows
the input and output currents of LTC3803-3-based power
supplies to rise in a smooth and controlled manner on
start-up.
Powering the LTC3803-3
In the simplest case, the LTC3803-3 can be powered from
a high voltage supply through a resistor. A built-in shunt
regulator from the VCC pin to GND will draw as much
current as needed through this resistor to regulate the
VCC voltage to around 9.5V as long as the VCC pin is not
forced to sink more than 25mA. This shunt regulator is
always active, even when the LTC3803-3 is in shutdown,
since it serves the vital function of protecting the VCC pin
from seeing too much voltage.
For higher efciency or for wide VIN range applications,
yback controllers are typically powered through a separate
bias winding on the yback transformer. The LTC3803-3
has the wide UVLO hysteresis (1V min) and small VCC
supply current draw (<90μA when VCC < VTURNON) that is
needed to support such bootstrapped hysteretic start-up
schemes.
The VCC pin must be bypassed to ground immediately
adjacent to the IC pins with a minimum of a 1μF ceramic
or tantalum capacitor. Proper supply bypassing is neces-
sary to supply the high transient currents required by the
MOSFET gate driver.
Adjustable Slope Compensation
The LTC3803-3 injects a 5μA peak current ramp out through
its SENSE pin which can be used for slope compensation in
designs that require it. This current ramp is approximately
linear and begins at zero current at 8% duty cycle, reach-
ing peak current at 80% duty cycle. Additional details are
provided in the Applications Information section.
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3803MPS6-3#TRM | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3803MPS6-3 | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3803HS6-3#PBF | 1 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3803HS6#PBF | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3803HS6#TRM | 1 A SWITCHING CONTROLLER, 240 kHz SWITCHING FREQ-MAX, PDSO6 |
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