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參數(shù)資料
| 型號： | CS7054YN14 |
| 廠商： | ZF Electronics Corporation |
| 英文描述： | CAT6 SOL PC WHI PLE 50FT PLENUM SOLID PATCH CORD |
| 中文描述： | 場效應(yīng)低邊PWM控制器 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大小： | 143K |
| 代理商： | CS7054YN14 |
C
3
Package Lead Description
PACKAGE LEAD #
LEAD SYMBOL
FUNCTION
Application Information
Oscillator
The IC sets up a constant frequency triangle wave at the
C
OSC
lead whose frequency is determined by the external
components R
OSC
and C
OSC
by the following equation:
Frequency =
The peak and valley of the triangle wave are proportional
to V
CC
by the following:
V
VALLEY
= 0.2
′
V
CC
V
PEAK
= 0.8
′
V
CC
This is required to make the voltage compensation func-
tion properly. In order to keep the frequency of the oscilla-
tor constant the current that charges C
OSC
must also vary
with supply. R
OSC
sets up the current which charges C
OSC
.
The voltage across R
OSC
is 50% of V
CC
and therefore:
I
ROSC
= 0.5
′
I
ROSC
is multiplied by two (2) internally and transferred to
the C
OSC
lead. Therefore:
I
COSC
= ±
The period of the oscillator is:
T = 2C
OSC
′
The R
OSC
and C
OSC
components can be varied to create fre-
quencies over the range of 15Hz to 25kHz. With the sug-
gested values of 105k and 390pF for R
OSC
and C
OSC
respectively, the nominal frequency will be approximately
20 kHz. I
ROSC
, at V
CC
= 14V, will be 66.7 μA. I
ROSC
should
not change over a more than 2:1 ratio and therefore C
OSC
should be changed to adjust the oscillator frequency.
Voltage Duty Cycle Conversion
The IC translates an input voltage at the CTL lead into a
duty cycle at the OUTPUT lead. The transfer function
incorporates Cherry Semiconductors patented Voltage
Compensation method to keep the average voltage and
current across the load constant regardless of fluctuations
(V
PEAK
- V
VALLEY
)
I
COSC
V
CC
R
OSC
V
CC
R
OSC
0.83
R
OSC
′
C
OSC
Theory Of Operation
14 Lead PDIP
1
OUTPUT
MOSFET Gate Drive
2
Gnd
Ground
3
FLT
Fault time out capacitor
4
C
OSC
R
OSC
CTL
Oscillator capacitor
5
Oscillator resistor
6
Pulse width control input
7
NC
No connection
8
V
REG
I
SENSE-
I
SENSE+
I
ADJ
INH
5V linear regulator
9
Current sense minus
10
Current sense plus
11
Current limit adjust
12
Output Inhibit
13
PGnd
Power ground for on chip clamp
14
V
CC
Positive power supply input
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