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參數資料
| 型號： | LE79R251JC |
| 英文描述： | Telecommunication IC |
| 中文描述： | 通信集成電路 |
| 文件頁數： | 10/22頁 |
| 文件大小： | 533K |
| 代理商： | LE79R251JC |
P R E L I M I N A R Y
10
Le79R251 ISLIC Data Sheet
Electrical Ranges
SPECIFICATIONS
Power Dissipation
Loop resistance = 0 to
∞
unless otherwise noted (not including fuse resistors), 2 x 50
fuse resistors.
For case 1: BATL = –36 V, BATH = –68 V, BATP = +52 V, and VCC = +5 V.
For case 2, BATL = -24 V, BATH = -48 V, BATP = +79 V, and VCC = +5 V.
For power dissipation measurements, DC-feed conditions are as follows:
ILA (Active mode current limit) = 25
mA (IRSN = 50 μA)
RFD (Feed resistance) = 500
VAS (Anti-sat activate voltage) = 10 V
VAPP (Apparent Battery Voltage) = 48 V
RMGL = RMGP (Thermal management resistors) = 1 k
VCC
5 V ± 5%
VBL
–15 V to VBH
VBH
–18 to –79 V
VBP
+79 to +8 V
Maximum supply voltage across device, VBP–VBH
140 V
BGND with respect to GND
–100 to +100 mV
20 k
minimum
20 k
minimum
Load resistance on VTX to Vref
Load resistance on VSAB to Vref
Description
Test Conditions
Case 1
Case 2
Unit
Typ
Max
Typ
Max
Power Dissipation Normal
Polarity
On-Hook Disconnect
65
85
55
80
mW
On-Hook Standby
110
140
90
120
On-Hook Transmission
Fixed Longitudinal Voltage
ISLIC
210
270
170
220
On-Hook Active High Battery
ISLIC
300
420
220
350
Off-Hook Active Low Battery
RL = 294
On-Hook Active Boost Battery
ISLIC
TMG
700
200
800
240
400
40
500
60
600
970
660
1050
Power Supply Currents
On-Hook Disconnect
VBH
VBL
VCC
VBP
0.6
0.1
3.9
0.08
0.9
0.2
4.5
0.15
0.6
0.1
3.9
0.08
0.9
0.2
4.5
0.15
mA
On-Hook Standby
VBH
VBL
VCC
VBP
1.3
0
4.3
0.12
1.7
0
5
0.3
1.3
0
4.3
0.12
1.7
0
5
0.3
On-Hook Transmission
Fixed Longitudinal Voltage
VBH
VBL
VCC
VBP
3.5
0
7.2
0.10
4.0
0
8.5
0.2
3.5
0
7.2
0.10
4.0
0
8.5
0.2
On-Hook Active High Battery
VBH
VBL
VCC
VBP
4
0
8.2
0.10
6
0
11
0.2
4
0
8.2
0.10
6
0
11
0.2
Off-Hook Active Low Battery
RL = 294
VBH
VBL
VCC
VBP
2.2
27.5
8.2
0.10
3
30
11
0.2
2.2
27.5
8.2
0.10
3
30
11
0.2
Active Boost
Battery On-Hook
VBH
VBL
VCC
VBP
5
0
5
5
8.5
0
8.5
7.5
5
0
5
5
8.5
0
8.5
7.5
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