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LTC1871 Datasheet(PDF) 8 Page - Linear Technology

Part # LTC1871
Description  Wide Input Range, No RSENSE Current Mode Boost, Flyback and SEPIC Controller
Download  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1871 Datasheet(HTML) 8 Page - Linear Technology

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LTC1871
8
1871fe
BLOCK DIAGRAM
+
1.230V
85mV
OV
50k
EA
UV
TO
START-UP
CONTROL
BURST
COMPARATOR
S
R
Q
LOGIC
PWM LATCH
CURRENT
COMPARATOR
0.30V
1.230V
5.2V
2.00V
1.230V
SLOPE
1.230V
ILOOP
FB
ITH
gm
3
MODE/SYNC
5
FREQ
4
2
INTVCC
8
LDO
V-TO-I
OSC
V-TO-I
SLOPE
COMPENSATION
BIAS AND
START-UP
CONTROL
VIN
BIAS
VREF
IOSC
RLOOP
+
+
C1
SENSE
10
GND
1871 BD
6
GATE
INTVCC
GND
7
VIN
1.248V
9
RUN
C2
1
0.6V
Main Control Loop
The LTC1871 is a constant frequency, current mode con-
troller for DC/DC boost, SEPIC and flyback converter ap-
plications. The LTC1871 is distinguished from conventional
current mode controllers because the current control loop
can be closed by sensing the voltage drop across the power
MOSFET switch instead of across a discrete sense resistor,
as shown in Figure 2. This sensing technique improves
efficiency, increases power density, and reduces the cost
of the overall solution.
For circuit operation, please refer to the Block Diagram of
the IC and Figure 1. In normal operation, the power MOSFET
is turned on when the oscillator sets the PWM latch and
is turned off when the current comparator C1 resets the
latch. The divided-down output voltage is compared to an
internal 1.230V reference by the error amplifier EA, which
outputs an error signal at the ITH pin. The voltage on the
ITH pin sets the current comparator C1 input threshold.
When the load current increases, a fall in the FB voltage
relative to the reference voltage causes the ITH pin to rise,
which causes the current comparator C1 to trip at a higher
peak inductor current value. The average inductor current
will therefore rise until it equals the load current, thereby
maintaining output regulation.
OPERATION


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