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CS5112 датащи(PDF) 8 Page - ON Semiconductor

номер детали CS5112
подробное описание детали  1.4 A Switching Regulator with 5.0 V, 100 mA Linear Regulator with Watchdog, RESET and ENABLE
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производитель  ONSEMI [ON Semiconductor]
домашняя страница  http://www.onsemi.com
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CS5112 датащи(HTML) 8 Page - ON Semiconductor

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Figure 11. Block Diagram of the 1.4 A Current Mode Control Switching Regulator Portion of the
CS5112 in a Boost Configuration
Bandgap
Reference
IBIAS
RBIAS
64.9 k
W
Switcher
Error
Amplifier
R1
R2
R3
VLIN
ENABLE
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 CS5112
t
IPeak
t
t
IPeak
ID
ISW
VSW
VSAT
VIN
VOUT
0
0
0
PROTECTION CIRCUITRY
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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