參數(shù)資料
型號(hào)： AN158
廠商： Macronix International Co., Ltd.
元件分類： DC/DC變換器
英文描述： REC3-SRW_DRW/H* Series - Econoline Regulated DC-DC Converters; Input Voltage (Vdc): 24V; Output Voltage (Vdc): 15V; Power: 3W; 2kV, 4kVDC & 6kVDC Isolation; Industry Standard 3W DIP24 Package; Feedback Regulated Output; Continuous Short Circuit Protection; Wide Input 2:1 & 4:1; Medical Approvals (4kV/6kV Versions); EN and UL Certificates; 3 Pinout Options, 3 Case Styles; Control Pin Option; Efficiency to 86%
中文描述： 串行數(shù)據(jù)接口芯片供應(yīng)雙極電壓
文件頁數(shù)： 3/3頁
文件大?。?/td> 22K
代理商： AN158
the guaranteed minimum output levels (±5V). assuming the output requires one whole data
period (4as at 250kbps) to slew from -5V to +5V, the ac component equals C
LOaD
(dv/dt) =
1000pF(10V/4as) = 2.5ma. For the dc component, Ohm's Law gives I = E/R = 5V/3k
=
1.67ma from one transmitter, so the three transmitters together represent a dc load of 5ma.
adding the ac and dc components together gives a conservative maximum rating of 2.5ma +
5ma = 7.5ma.
The 3k
load is an EIa-232 requirement, but the data rate and load capacitance are
application-dependent parameters. Lower values for these parameters make more current
available for external use. a remote-sensing system, for instance, might operate at 2400
bits/sec (2400bps) with a load of 3k
in parallel with 1000pF (50 feet of cable at 20pF/ft).
The dc load for three transmitters is 5ma, and the ac load for one transmitter (72μA) is
almost negligible in this low-data-rate application. So, the available current in this case is
calculated as 7.5ma - (5ma + 72μA) = 2.428ma.
The above calculation is conservative: with V
CC
= 2.7V and the three transmitters loaded
with 3k
||1000pF, a circuit transmitting valid EIa-232 levels at 2400bps will actually deliver
6.7ma to an external load (even more for V
CC
= 3V and up). as mentioned, Q1 and Q2
enable the circuit to start under these conditions. If you disconnect the transmitter loads, the
maximum external load current that allows start-up is 11.5ma. With Q1 and Q2 removed, the
maximum is only 5.7ma.
More Information
MAX3212:
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