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參數資料
| 型號： | MIC502 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | FPGA |
| 英文描述： | FPGA - 100000 SYSTEM GATE 2.5 VOLT - NOT RECOMMENDED for NEW DESIGN |
| 中文描述： | 范進展信息管理IC |
| 文件頁數： | 11/11頁 |
| 文件大小： | 130K |
| 代理商： | MIC502 |
May 1999
173
MIC502
MIC502
Micrel
The design consists soley of choosing the value R
BASE
in
Figures 7 and 8. To minimize on-chip power dissipation in the
MIC502, the value of R
BASE
should be determined by the
power supply voltage. The Electrical Characteristics table
specifies a minimum output current of 10mA. However,
different output voltage drops (V
DD
– V
OUT
) exist for 5V vs.
12V operation. The value R
BASE
should be as high as
possible for a given required transistor base-drive current in
order to reduce on-chip power dissipation.
Referring to the “Typical Application” and to the “Electrical
Characteristics” table, the value for R
BASE
is calculated as
follows. For V
DD
= 5V systems, I
OH
of OUT (pin 7) is
guaranteed to be a minimum of 10mA with a V
OH
of 2.4V.
R
BASE
then equals (2.4V – V
BE
)
÷
10mA = 170
.
For V
DD
= 12V systems, R
BASE
= (3.4 – 0.7)
÷
0.01 = 250
.
Overtemperature Fault Output
The /OTF output, pin 6, is an open-collector NPN output. It is
compatible with CMOS and TTL logic and is intended for
alerting a system about an overtemperature condition or
triggering a power supply crowbar circuit. If V
DD
for the
MIC502 is 5V the output should not be pulled to a higher
voltage. This output can sink up to 2mA and remain compat-
ible with the TTL logic-low level.
Timing Capacitors vs. PWM Frequency
The recommended C
F
(see first page) is 0.1
μ
F for opertaion
at a PWM frequency of 30Hz. This frequency is factory
trimmed within
±
3Hz using a 0.1% accurate capacitor. If it is
desired to operate at a different frequency, the new value for
C
F
is calculated as follows:
C =3
f
μ
F and f is in Hz.
The composition, voltage rating, ESR, etc., parameters of the
capacitor are not critical. However, if tight control of frequency
vs. temperature is an issue, the temperature coefficient may
become a consideration.
VT1
CF
VSLP
GND
VDD
OUT
OTF
VT2
1
2
3
4
8
7
6
5
R1
100k
T1
R3
56k
R4
56k
C
F
R2
33k
5V
R
BASE
180
Overtemperature
Fault Output
MIC502
NLX FanC
Signal Input
Yate Loon
YD80SM-12
or similar fan
Q1
0.1μF
100k
47k
Keystone Thermonics
RL2010-54.1K-138-D1
or similar
120k
12V
Figure 7. Typical 5V V
DD
Application Circuit
VT1
CF
VSLP
GND
VDD
OUT
OTF
VT2
1
2
3
4
8
7
6
5
R1
100k
T1
R3
56k
R4
56k
C
F
R2
33k
12V
R
BASE
280
Overtemperature
Fault Output
MIC502
NLX FanC
Signal Input
Yate Loon
YD80SM-12
or similar fan
Q1
0.1μF
5V
4.7k
47k
Keystone Thermonics
RL2010-54.1K-138-D1
or similar
Figure 8. Typical 12V V
DD
Application Circuit
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