參數(shù)資料
型號(hào)： LNBP9LIT
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, SFM5
封裝： ROHS COMPLIANT, IPPAK-5
文件頁(yè)數(shù)： 2/21頁(yè)
文件大?。?/td> 439K
代理商： LNBP9LIT
Detailed description and application hints
LNBP8L, LNBP9L, LNBP10L, LNBP11L
10/21
Doc ID 15153 Rev 2
time TON depending on the CEXT value (see Figure 24 and Figure 25). When TON
has elapsed, the output goes low for a time of TOFF = 12 x TON. This keeps the
power dissipated by the device low in overload conditions, and avoids the need for
an oversized heat sink in this condition. For the IPPAK package, when the
overload or the short-circuit occurs, the device clamps the output current in a
range between 550 mA and 850 mA.
7.
EXTM modulates the VOUT by means of a capacitor connected in series (see Figure 6).
The following equation is used to calculate the peak-to-peak voltage of VOUT:
Equation 1
VOUT(AC) = VEXTM(AC) x GEXTM
where VOUT(AC) and VEXTM(AC) are, respectively, the peak-to-peak voltage of VOUT and
VEXTM. GEXTM is the external modulation gain.
6.1
Input voltage protection
In some cases two or more receivers share the same coaxial cable, rendering their outputs
hard-paralleled, so the same voltage is present at the outputs of the receivers. If a receiver
is not disconnected at the mains, a current will flow from the OUTPUT to the VCC1 or VCC2
pins, depending the EN/VSEL pin setting. To avoid this, two diodes (only one for the IPPAK
package) in series are recommended at input pins VCC1 and VCC2 (see Figure 3). These
diodes do not cause a change at VOUT, but only a voltage drop, which can be minimized by
using Schottky diodes. Diodes used in Figure 4 and Figure 5 must withstand a continuous
current of almost 1 A and a breakdown voltage of 30 V (suggested type is 1N4001 or
BYV10-30). Be aware that the minimum voltage needed at the VCC pins must be respected,
considering the voltage drop across the input diodes).
6.2
Single supply for the DFN package
If only one power supply source is available, the VCC1 and VCC2 pins can be powered by the
same power source without affecting the performance of other circuits, at the cost of higher
power losses in the device and higher heat sink surface. Also, in order to reduce the power
dissipation in the device, an appropriate-value resistor can be inserted in series with the
Figure 6.
EXTM application circuit
VCC
EN/VSEL (Tristate)
OUTPUT
GND
EXTM
D1
1N4001
Vextm
23V
LNBP8/9L
C2
220nF
C1
10F
LNB OUTPUT
C3
100nF
D2
1N5818
C4
1F
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