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參數(shù)資料
| 型號： | APW7057 |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | High Power Step-Down Synchronous DC/DC Controller |
| 中文描述： | 高功率降壓型同步DC / DC控制器 |
| 文件頁數(shù)： | 6/14頁 |
| 文件大?。?/td> | 154K |
| 代理商： | APW7057 |
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Oct., 2003
APW 7057
www.anpec.com.tw
6
the over current limit. An internally generated 40uA
current source will flow through this resistor, creat-
ing a voltage drop. This voltage will be compared
with the voltage across the high side MOSFET. The
threshold of the over current limit is therefore given
by:
I
OI
=
An over current condition will cycle the soft start
function. After three consecutive cycles and if the
fault condition persists, the controller will be shut
down. To restart the controller, either recycle the V
CC
supply or momentarily pull the OSCSET pin below
1.25V.
PHASE (Pin 8)
This pin is connected to the source of the high-side
MOSFET and is used to monitor the voltage drop
across the high-side MOSFET for over-current
protection.
250
260
270
280
290
300
310
320
330
340
350
-50
-25
0
25
50
75
100
125
150
Functional Pin Description
nal resistive divider across the output (V
OUT
).
The
output voltage is determined by:
V
OUT
= 0.8V(1+R
where R
OUT
is the resistor connected between V
OUT
and FB while R
GND
is the resistor connected from FB
to GND
.
OCSET (Pin 7)
This pin serves two functions: as a shutdown con-
trol and for setting the over current limit threshold.
Pulling this pin below 1.25V shuts the controller
down, forcing the UGATE and LGATE signals to be
at 0V. A soft start cycle will be initiated upon the re-
lease of this pin.
A resistor (R
ocset
) connected between this pin and
the drain of the high side MOSFET will deter
OUT
R
GND
40uA x
R
OCSET
R
DS(ON)
Typical Characteristics
0.788
0.792
0.796
0.800
0.804
0.808
0.812
-50
-25
0
25
50
75
100
125
150
Reference Voltage vs. Junction Temperature
R
R
Junction Temperature (
o
C)
Switching Frequency vs. Junction Temperature
Junction Temperature (
°
C)
S
O
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