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參數(shù)資料
| 型號： | ah-29 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:22; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:12; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:12-22 RoHS Compliant: No |
| 中文描述： | ⑩保護超級穩(wěn)壓器穩(wěn)壓器的MOSFET的杰里克梅茨 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大小： | 25K |
| 代理商： | AH-29 |
AH-29
Micrel
3
1997
3-207
appropriate for some applications. Enable time is approxi-
mately k1
×
R5
×
C5; disable time is approximately k2
×
R6
×
C5.
Constants k1 and k2 are determined primarily by the two
threshold voltages (V
T
+ and V
T
–) of Schmitt-trigger gate B.
Values for k1 and k2 (empirically derived from a breadboard)
are 0.33 and 0.23, respectively. Component tolerances were
ignored.
Getting Started
The MIC5158 produces a brief logic-low error-flag output at
start-up because when first enabled the output voltage is
zero. Notice that the protection circuitry provides a system
enable input. Use of this input is optional; it should be tied to
V
IN
if not required. Since the output of gate B is logic high
when the oscillator is disabled, a logic-high system enable
input enables the MIC5158, which immediately produces the
brief logic-low flag output mentioned above. Since the power
supply output may or may not be shorted, it is desirable to wait
and see. The required wait-delay timing is implemented by
Resistor R4, capacitor C4, and diode D1. The leading-edge
of the regulator enable signal is delayed (before application
to gate A) for about 4ms, to attempt to span the width of the
logic-low flag that is generated during a normal (non-shorted)
regulator start-up. Providing enough delay time to span the
time of the flag may not always be practical, especially when
starting with high-capacitance loads. If the logic-low flag is
longer than the delayed enable input to gate A, the oscillator
will cycle through its on/off duty cycle and the circuit will again
attempt a normal start-up. This will result in a slowing of the
regulator turn-on, but this is not usually objectionable be-
cause it reduces turn-on surge currents.
After start-up the logic-high inputs to gate A hold the oscillator
off and the system remains enabled as long as no error flag
is generated. If the flag is generated due to a short, the
MIC5158 remains enabled only for the time of the oscillator
enable pulse and is then immediately disabled for the dura-
tion of the oscillator cycle. As long as the short exists the
oscillator runs and the system monitors the flag to detect
removal of the short; meanwhile the MOSFET is protected,
and the system again starts when the short is removed.
1
2
3
4
14
13
12
11
5
6
7
10
9
8
MIC5158
C
V
C
G
F
5
E
C
C
V
D
G
D
S
E
V
OUT
3.3V, 10A
V
IN
(5V)
C2
0.1μF
C1 0.1μF
R3
10k
C
**
47μF
*For V
IN
> 5V, use IRFZ44
**Improves transient response to load changes
0.035V
I
LIMIT
C
IN
47μF
C3
3.3μF
R1
17.8k
1%
R2
10.7k
1%
Q1*
IRLZ44
C
D
11
14
V
IN
12
13
10
C
7
9
8
4
B
C5
0.01μF
6
5
3
D2
D1
D3
R5
33k
R6
1M
R4
10k
1
2
A
C4
470pF
System
Enable
All Diodes Are 1N914
U1
CD4093BC
R
S
***
2.3m
* **R
S
≈
Figure 2. Short-Circuit Protected 10A Regulator
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| AH0014C | Sand Paper; Abrasive Grade:A MED; Color:Maroon; Pack Quantity:3; Roll Length:30ft; Width:4" |
| AH0014CD | DIP Socket; No. of Contacts:64; Pitch Spacing:0.07"; Row Spacing:0.8"; Terminal Type:PC Board; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):No RoHS Compliant: Yes |
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| AH0015 | DIP Socket; No. of Contacts:64; Pitch Spacing:0.07"; Row Spacing:0.8"; Terminal Type:Solder Tail; Leaded Process Compatible:Yes; Peak Reflow Compatible (260 C):No RoHS Compliant: Yes |
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