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參數(shù)資料
| 型號： | W671540P |
| 廠商： | WINBOND ELECTRONICS CORP |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 8/42頁 |
| 文件大?。?/td> | 1230K |
| 代理商： | W671540P |
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W671500 SERIES
a maximum of -56V (by MTU REF) when operating from either the high or low battery. A switch and
600 resistor connect the MTU reference to the Ring terminal. When the high battery voltage exceeds
the MTU reference of -56V, the Ring terminal will be clamped by the internal reference (typically -
54V). The same Ring relationships apply when operating from the low battery voltage. For high battery
voltages (VBH) less than or equal to the internal MTU reference threshold:
VRING
VBH 4
+
=
(EQ. 21)
7.2.1.3. Loop Current
During Low Power Standby, the device will provide current to a load. The current path is through
resistors and switches, and will be a function of the off hook loop resistance (RLOOP) which includes
the off hook phone resistance and copper loop resistance. The current available during Low Power
Standby is determined by the following equation.
ILOOP
1
49
(
)
(
) 600 600 RLOOP
+
(
)
=
(EQ. 22)
Internal current limiting of the standby switches will limit the maximum current to 20 mA.
Another loop current related parameter is longitudinal current capability. The longitudinal current
capability is reduced to 10 mARMS per pin. The reduction in longitudinal current capability is a result of
disabling the Tip and Ring amplifiers.
7.2.1.4. On-hook Power Dissipation
The On-hook power dissipation of the device during Low Power Standby is determined by the
operating voltages and quiescent currents and is calculated using the following equation.
PLPS VBH IBHQ
×
VBL IBLQ
×
VCC ICCQ
×
+
=
(EQ. 23)
The quiescent current terms are specified in the electrical tables for each operating mode. Load power
dissipation is not a factor since this is an On-hook mode. Some applications may specify a standby
current which may be a charging current required for some modern telephone electronics.
7.1.5. Standby Current Power Dissipation
Any standby line current, ISLC, introduces an additional power dissipation term PSLC. The following
equation illustrates that the power contribution is zero when the standby line current is zero.
PSLC ISLC
VBH
49
1 ISLCx1200
+ +
(
)
×
=
(EQ. 24)
If the battery voltage is less than -49V (the MTU clamp is off), the standby line current power
contribution reduces to the following.
- 16 -
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