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CS5112 参数 Datasheet PDF下载

CS5112图片预览
型号: CS5112
PDF下载: 下载PDF文件 查看货源
内容描述: 1.4A开关稳压器,5V , 100mA线性稳压与看门狗,复位和使能 [1.4A Switching Regulator with 5V, 100mA Linear Regulator with Watchdog, RESET and ENABLE]
分类和应用: 稳压器开关
文件页数/大小: 10 页 / 203 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
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Application Notes: continued  
V
IN  
Pole due to error amplifier  
output impedance and C  
1
A
f
z
= 1/2pR C  
4 1  
V
V
OUT  
V
OUT  
= 18V, Select > 2V  
= 16V, Select < 0.8V  
ENABLE  
IN  
f
P
= 1/pR C  
4 2  
NC  
NC  
V
REG  
+G  
C
L=33mH  
5V  
G
V
LIN  
B
100mF  
ESR<8W  
error amplifier gain  
-20dB/dec  
V
I
SW  
BIAS  
C
88mF  
OUT  
R
BIAS  
= 64.9kW  
(2)  
Gnd  
Gnd  
Gnd  
Gnd  
f
P
= 1/p R  
C
Load OUT  
R
1
100kW  
Gnd  
Gnd  
Gnd  
Gnd  
f
CO  
MICROPROCESSOR  
0
V
V
RESET  
FB1  
FB2  
R
(1)  
946W  
7.5kW  
2
C
Delay  
WDI  
C
0.1mF  
modulator gain + feedback resistor divider attenuation  
delay  
R
3
SELECT  
COMP  
-G  
C
OSC  
C
COMP  
C
OSC  
390pF  
0.33mF  
f
= 1/2p ESR C  
OUT  
z
Figure 10. Bode plot of error amplifier (OTA) gain and modulator gain  
added to the feedback resistor divider attenuation.  
Figure 11. A typical application diagram with external components con-  
figured in a boost topology.  
A pole at point C:  
Step 9  
fp = 1/(¹R4C2),  
(8g)  
Finally the watchdog timer period and Power on Reset  
time is determined by:  
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.  
tDelay = 1.353 ´ CDelayRBIAS  
.
(9)  
Linear Regulator Output Current vs. Input Voltage  
100  
100  
75  
50  
25  
0
75  
50  
25  
0
Q
= 35°C/W  
JA  
Q
= 55°C/W  
JA  
V
= 14V  
IN  
V
= 14V  
IN  
Max Total Power = 1.86W  
Max Total Power = 1.18W  
15  
30  
15  
30  
0
5
10  
20  
25  
0
5
10  
20  
25  
V
(V)  
V
(V)  
REG  
REG  
Figure 12: The shaded area shows the safe operating area of the CS5112 as a function of ILIN, VREG, and QJA. Refer to the table below for typical  
loads and voltages.  
Worst Case Switcher  
Power Available  
(QJA = 55¡C/W)  
Worst Case Switcher  
Power Available  
(QJA = 35¡C/W)  
Linear Power  
Dissipation  
VREG  
(V)  
20  
20  
20  
20  
25  
25  
25  
25  
VIN  
(V)  
14  
14  
14  
14  
14  
14  
14  
14  
ILIN  
(mA)  
25  
50  
75  
100  
25  
50  
75  
100  
(W)  
(W)  
0.74  
0.35  
*
(W)  
1.42  
1.03  
0.64  
0.26  
1.26  
0.75  
0.24  
*
0.44  
0.83  
1.22  
1.60  
0.60  
1.11  
1.62  
2.14  
*
0.58  
0.07  
*
*
* Subjecting the CS5112 to these conditions will exceed the maximum total power that the part can handle, thereby forcing it into thermal limit.  
9