LTC3873-5 Datasheet, PDF (6/16 Pages) Linear Technology – No RSENSETM Constant Frequency Current Mode Boost/Flyback/SEPIC DC/DC Controller

LTC3873-5
FUNCTIONAL DIAGRAM
V_CC
UNDERVOLTAGE ^UV
LOCKOUT
VOLTAGE
REFERENCE
1.2V
V_CC
SHUNT
REGULATOR
GND SW
SLOPE
COMPENSATION
SHUTDOWN
COMPARATOR
3μA
RUN/SS
SHDN
INTERNAL
SOFT-START
RAMP
+
I_TH
BUFFER
–
–+
IPRG
CURRENT
COMPARATOR
I_LIM
RS ^{R S}
LATCH _Q
200kHz
OSCILLATOR AND
MAX DUTY CYCLE
CURRENT LIMIT
CLAMP
ERROR
AMPLIFIER
1.2V
I_TH
V_IN
SWITCHING
LOGIC CIRCUIT
NGATE
V_FB
38735 FD
38735fb
6