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CS5111YDWF24 Scheda tecnica(PDF) 8 Page - ON Semiconductor

Il numero della parte CS5111YDWF24
Spiegazioni elettronici  Switching Regulator
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Figure 11. Block Diagram of the 1.4 A Current Mode Control Switching Regulator Portion of the
CS5111 in a Boost Configuration
Overvoltage
Bandgap
Reference
IBIAS
RBIAS
64.9 k
Switcher
Error
Amplifier
R1
R2
R3
VLIN
ENABLE
VREG
Oscillator
COSC
COMP
COMP
Logic
Current Sense Amplifier
Base Drive
+
+
Switcher Shutdown
1.25 V
Multiplexer
VIN
VOUT
COUT
VSW
RS
GND
1.4 A
VFB1
VFB2
SELECT
+
Figure 12. Voltage and Current Waveforms
for Boost Topology in CS5111
t
IPeak
t
t
IPeak
ID
ISW
VSW
VSAT
VIN
VOUT
0
0
0
PROTECTION CIRCUITRY
If the input voltage at VREG is increased above the
overvoltage threshold, the drive to the linear and switcher
output transistors is shut off. Therefore, VLIN is disabled and
VSW can not be pulled low.
The current out of VLIN is sensed in order to limit
excessive power dissipation in the linear output transistor
over the output range of 0 V to regulation. Also, the current
into VSW is sensed in order to provide the current limit
function in the switcher output transistor.
If the die temperature is increased above 160
°C, either due
to excessive ambient temperature or excessive power
dissipation, the drive to the linear output transistor is
reduced proportionally with increasing die temperature.
Therefore, VLIN will decrease with increasing die
temperature above 160
°C. Since the switcher control
circuitry
is
powered
through
VLIN, the switcher
performance, including current limit, will be affected by the
decrease in VLIN.


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