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參數資料
| 型號： | FAN1851AN |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號調理 |
| 英文描述： | Ground Fault Interrupter |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 2/11頁 |
| 文件大小： | 122K |
| 代理商： | FAN1851AN |
FAN1851A
PRODUCT SPECIFICATION
2
REV. 2.0.1 6/17/05
Functional Description
The voltage at the supply pin is clamped to +26V by the
internal shunt regulator D3. This shunt regulator also
generates an artificial ground voltage for the noninverting
input of A1 (shown as a +10V source). A1, Q1, and Q2
together act as a current mirror for fault current signals
(which are derived from an external transformer). When a
fault signal is present, the mirrored current charges the
external timing capacitor until its voltage exceeds the latch
trigger threshold (typically 17.5V). When this threshold is
exceeded, the latch engages and Q3 turns off, allowing I
2
to
drive the SCR connected to the "SCR Trigger" pin.
Extra Circuitry in the feedback path of A1 works with the
switched current source I
1
to remove any charge on C
T
induced by noise in the transformer. If no fault current is
present, then I
1
discharges C
T
with a current equal to 3 I
TH
,
where I
TH
is the value of current set by the external R
SET
resistor. If fault signals are present at the input of A1 (which
is held at virtual ground, +10V), one of the two current
mirrors in the feedback path of A1 (Q4 and Q5) will become
active, depending on which half-cycle the fault occurs.
This action will raise the voltage at V
S
, switching I
1
to a
value equal to I
TH
, and reducing the discharge rate of C
T
to
better allow fault currents to charge it.
Notice that I
TH
discharges C
T
during both half-cycles of the
line, while I
F
only charges C
T
during the half-cycle in which
I
F
exits the "- Input" pin (since Q1 will only carry fault cur-
rent in one direction). Thus, during one half-cycle, I
F
-I
TH
charges C
T
, while during the other half-cycle I
TH
discharges
it.
Pin Assignments
SCR Trigger
– Input
+ Input
Ground
+V
S
C
T
R
SET
Amp Out
1
2
3
4
8
7
6
5
Definition of Terms
Normal Fault:
An unintentional electrical path, R
B
, between the load termi-
nal of the hot line and the ground, as shown by the dashed
lines in Figure1.
Figure 1. Normal Fault
Grounded Neutral Fault:
An unintentional electrical path between the load terminal of
the neutral line and the ground, as shown by the dashed lines
in Figure 2.
Figure 2. Grounded Neutral Fault
Hot
GFI
Neutral
Line
Hot
R
LOAD
R
B
Neutral
R
G
Hot
GFI
Neutral
Line
Hot
R
LOAD
R
IN
Neutral
R
G
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