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LCYG Folha de dados(PDF) 8 Page - Linear Technology

Nome de Peças LCYG
Descrição Electrónicos  36V, 2A, 2.4MHz Step-Down Switching Regulator
Download  24 Pages
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Fabricante Electrônico  LINER [Linear Technology]
Página de início  http://www.linear.com
Logo LINER - Linear Technology

LCYG Folha de dados(HTML) 8 Page - Linear Technology

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LT3505
8
3505fc
BLOCK DIAGRAM
7
Σ
R
DRIVER
Q1
S
OSC
SLOPE
COMP
FREQUENCY
FOLDBACK
INT REG
AND
UVLO
VC
gm
780mV
3505 BD
5
3
4
Q
Q
1
2
BOOST
SW
FB
R2
R1
VOUT
L1
D2
C3
C1
D1
VIN
C2
VIN
ON OFF
GND
6
RT
8
VC
C4
R3
SHDN
OPERATION (Refer to Block Diagram)
The LT3505 is a constant frequency, current mode step-
downregulator.Aresistor-programmedoscillatorenables
an RS flip-flop, turning on the internal 1.4A power switch
Q1. An amplifier and comparator monitor the current
flowing between the VIN and SW pins, turning the switch
off when this current reaches a level determined by the
voltage at the VC pin. An error amplifier measures the
output voltage through an external resistor divider tied to
the FB pin and servos the VC node. If the error amplifier’s
output increases, more current is delivered to the output;
if it decreases, less current is delivered. An active clamp
(not shown) on the VC node provides current limit. The
VC node is also clamped to the voltage on the SHDN pin;
soft-start is implemented by generating a voltage ramp at
the SHDN pin using an external resistor and capacitor.
Aninternalregulatorprovidespowertothecontrolcircuitry.
This regulator includes an undervoltage lockout to prevent
switching when VIN is less than ~3.4V. The SHDN pin is
used to place the LT3505 in shutdown, disconnecting the
output and reducing the input current to less than 2µA.
The switch driver operates from either the input or from
the BOOST pin. An external capacitor and diode are used
to generate a voltage at the BOOST pin that is higher than
the input supply. This allows the driver to fully saturate
the internal bipolar NPN power switch for efficient opera-
tion.
When the FB pin is low, the voltage at the RT pin decreases
toreducetheoscillatorfrequency.Thisfrequencyfoldback
helps to control the output current during start-up and
overload.


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