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参数资料
| 型号： | W671330P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 17/48页 |
| 文件大小： | 1344K |
| 代理商： | W671330P |
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W671300 SERIES
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. 45)
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.
7.2.1.5. 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
54
1 ISLCx1200
+ +
(
)
×
=
(EQ. 46)
If the battery voltage is less than -54V (the MTU clamp is off), the standby line current power
contribution reduces to the following.
PSLC ISLC
VBH 1 ISLCx1200
+ +
(
)
×
=
(EQ. 47)
Most applications do not specify charging current requirements during standby. When specified, the
typical charging current may be as high as 5 mA.
7.2.2. FORWARD ACTIVE MODE
The Forward Active mode (FA, 001) is the primary AC transmission mode of the device. On-hook
transmission, DC loop feed and voice transmission are supported during Forward Active. Loop
supervision is provided by either the Switch Hook Detector (E0 = 1) or the Ground Key Detector
(E0 = 0). The device may be operated from either high or low battery for on-hook transmission and
low battery for loop feed.
7.2.2.1. On-Hook Transmission
The primary purpose of On-hook transmission is to support caller ID and other advanced signalling
features. The transmission over load level while On-hook is 1VPEAK.
When operating from the high battery, the DC voltages at Tip and Ring are MTU compliant. The
typical Tip voltage is -4V. For battery voltages less than -60V, the Ring voltage is a function of the
battery voltage and is calculated as follows.
VRING
VBH 5
+
=
(EQ. 48)
Loop supervision is provided by the Switch Hook Detector at the DET output. When DET goes
LOW, the low battery should be selected for DC loop feed and voice transmission.
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