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CS5111YDWFR24 데이터시트(PDF) 9 Page - Cherry Semiconductor Corporation

부품명 CS5111YDWFR24
상세설명  1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE
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제조업체  CHERRY [Cherry Semiconductor Corporation]
홈페이지  http://www.cherrycorp.com/
Logo CHERRY - Cherry Semiconductor Corporation

CS5111YDWFR24 데이터시트(HTML) 9 Page - Cherry Semiconductor Corporation

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Figure 10. Bode plot of error amplifier (OTA) gain and modulator gain
added to the feedback resistor divider attenuation.
A pole at point C:
fp = 1/(πR4C2),
(8g)
offsets the zero set by the ESR of the output capacitors.
An alternative scheme uses a single capacitor as shown in
Figure 11, to roll the gain off at a relatively low frequency.
Figure 11. A typical application diagram with external components con-
figured in a boost topology.
Step 9
Finally the watchdog timer period and Power on Reset
time is determined by:
tDelay = 1.353 × CDelayRBIAS.
(9)
VIN
NC
NC
VSW
Gnd
Gnd
Gnd
Gnd
VFB1
VFB2
SELECT
COMP
VREG
VLIN
IBIAS
Gnd
Gnd
Gnd
Gnd
CDelay
WDI
COSC
RBIAS = 64.9kΩ
100µF
ESR<8Ω
0.1µF
CCOMP
0.33µF
L=33µH
VIN
COUT
88µF
(2)
100kΩ
946Ω
7.5kΩ
R1
R2
R3
Cdelay
390pF
COSC
RESET
ENABLE
(1)
VOUT = 18V, Select > 2V
VOUT = 16V, Select < 0.8V
MICROPROCESSOR
5V
Pole due to error amplifier
output impedance and C1
G
0
fz = 1/2πR4C1
+G
B
A
C
fP = 1/π RLoadCOUT
error amplifier gain
fCO
fz = 1/2π ESR COUT
fP = 1/πR4C2
-20dB/dec
-G
modulator gain + feedback resistor divider attenuation
9
Application Notes: continued
25
0
05
VREG (V)
50
75
100
10
20
25
15
30
ΘJA = 35°C/W
VIN = 14V
Max Total Power = 1.86W
25
0
05
VREG (V)
50
75
100
10
20
25
15
30
ΘJA = 55°C/W
VIN = 14V
Max Total Power = 1.18W
Worst Case Switcher
Worst Case Switcher
Linear Power
Power Available
Power Available
VREG
VIN
ILIN
Dissipation
JA = 55°C/W)
JA = 35°C/W)
(V)
(V)
(mA)
(W)
(W)
(W)
20
14
25
0.44
0.74
1.42
20
14
50
0.83
0.35
1.03
20
14
75
1.22
*
0.64
20
14
100
1.60
*
0.26
25
14
25
0.60
0.58
1.26
25
14
50
1.11
0.07
0.75
25
14
75
1.62
*
0.24
25
14
100
2.14
*
*
Linear Regulator Output Current vs. Input Voltage
Figure 12: The shaded area shows the safe operating area of the CS5111 as a function of ILIN, VREG, and ΘJA. Refer to the table below for typical
loads and voltages.
* Subjecting the CS5111 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit.


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