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參數(shù)資料
| 型號： | CS5111YDWF24 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | 1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE |
| 中文描述： | 1.4A的開關穩(wěn)壓器采用5V，100mA的線性穩(wěn)壓器，帶有看門狗，復位和啟用 |
| 文件頁數(shù)： | 9/10頁 |
| 文件大?。?/td> | 188K |
| 代理商： | CS5111YDWF24 |
Figure 10. Bode plot of error amplifier (OTA) gain and modulator gain
added to the feedback resistor divider attenuation.
A pole at point C:
f
p
= 1/(
π
R
4
C
2
),
(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:
t
Delay
= 1.353
×
C
Delay
R
BIAS
.
(9)
V
IN
NC
NC
V
SW
Gnd
Gnd
Gnd
Gnd
V
FB1
V
FB2
SELECT
COMP
V
REG
V
LIN
I
BIAS
Gnd
Gnd
Gnd
Gnd
C
Delay
WDI
C
OSC
R
BIAS
= 64.9k
100
F
ESR<8
0.1
μ
F
C
0.33
μ
F
L=33
μ
H
V
IN
C
OUT
88
μ
F
(2)
100k
946
7.5k
R
1
R
2
R
3
C
delay
390pF
C
C
RESET
ENABLE
(1)
V
OUT
V
OUT
= 18V, Select > 2V
MICROPROCESSOR
5V
Pole due to error amplifier
1
G
0
f
z
= 1/2
π
R4C1
+G
B
A
C
f
P
= 1/
π
R
Load
C
OUT
error amplifier gain
f
CO
f
z
= 1/2
π
ESR C
OUT
f
P
= 1/
π
R
4
C
2
-20dB/dec
-G
G
modulator gain + feedback resistor divider attenuation
9
C
Application Notes: continued
25
0
0
5
V
REG
(V)
50
75
100
10
20
25
I
L
15
30
Θ
JA
= 35
°
C/W
V
IN
= 14V
Max Total Power = 1.86W
25
0
0
5
V
REG
(V)
50
75
100
10
20
25
I
L
15
30
Θ
JA
= 55
°
C/W
V
IN
= 14V
Max Total Power = 1.18W
Worst Case Switcher
Power Available
(
Θ
JA
= 55°C/W)
(W)
0.74
0.35
*
*
0.58
0.07
*
*
Worst Case Switcher
Power Available
(
Θ
JA
= 35°C/W)
(W)
1.42
1.03
0.64
0.26
1.26
0.75
0.24
*
Linear Power
Dissipation
(W)
0.44
0.83
1.22
1.60
0.60
1.11
1.62
2.14
V
REG
(V)
20
20
20
20
25
25
25
25
V
IN
(V)
14
14
14
14
14
14
14
14
I
LIN
(mA)
25
50
75
100
25
50
75
100
Linear Regulator Output Current vs. Input Voltage
Figure 12: The shaded area shows the safe operating area of the CS5111 as a function of I
LIN
, V
REG
, and
Θ
JA
. 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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