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參數(shù)資料
| 型號(hào)： | BH18LB1WHFV-TR |
| 元件分類： | 固定正電壓?jiǎn)温份敵鰳?biāo)準(zhǔn)穩(wěn)壓器 |
| 英文描述： | FIXED POSITIVE REGULATOR, PDSO5 |
| 封裝： | HVSOF-5 |
| 文件頁數(shù)： | 6/9頁 |
| 文件大?。?/td> | 850K |
| 代理商： | BH18LB1WHFV-TR |
6/8
Mounting input capacitor between input pin and GND(as close to pin as possible), and also output capacitor between output
pin and GND(as close to pin as possible) is recommended.
The input capacitor reduces the output impedance of the voltage supply source connected to the VCC. The higher value the
output capacitor goes, the more stable the whole operation becomes. This leads to high load transient response.
Please confirm the whole operation on actual application board.
Generally, ceramic capacitor has wide range of tolerance, temperature coefficient, and DC bias characteristic. And also its
value goes lower as time progresses. Please choose ceramic capacitors after obtaining more detailed data by asking capacitor
makers.
Input/Output capacitor
100
10
1
0.1
0.01
0
100
200
300
ESR()
Output current IOUT(mA)
Cout=1.0F
Cin=1.0F
Ta=+25 C
BH
LB1WHFV/WG
BH
MA3WHFV
Fig. 32 BH
LB1WHFV/WG
Stable operating region characteristics (Example)
100
10
1
0.1
0.01
0
50
100
150
ESR()
Output current IOUT(mA)
Cout=1.0F
Ta=+25 C
BH
FB1WHFV/WG
Fig. 33 BH
FB1WHFV/WG
Stable operating region characteristics (Example)
100
10
1
0.1
0.01
0
50
100
150
ESR()
Output current IOUT(mA)
Cout=2.2F
Stable region
The IC incorporates a built-in over current protection circuit that operates according to the output current capacity. This circuit
serves to protect the IC from damage when the load is shorted. The protection circuits use fold-back type current limiting and
are designed to limit current flow by not latching up in the event of a large and instantaneous current flow originating from a
large capacitor or other component. These protection circuits are effective in preventing damage due to sudden and
unexpected accidents. However, the IC should not be used in applications characterized by the continuous operation or
transitioning of the protection circuits.
Over current protection circuit
This system has a built-in thermal shutdown circuit for the purpose of protecting the IC from thermal damage. As shown
above, this must be used within the range of power dissipation, but if the power dissipation happens to be continuously
exceeded, the chip temperature increases, causing the thermal shutdown circuit to operate. When the thermal shutdown
circuit operates, the operation of the circuit is suspended. The circuit resumes operation immediately after the chip
temperature decreases, so the output repeats the ON and OFF states. There are cases in which the IC is destroyed due to
thermal runaway when it is left in the overloaded state. Be sure to avoid leaving the IC in the overloaded state.
Thermal shutdown circuit
Other precautions
Use caution when using the IC in the presence of a strong magnetic field as such environments may occasionally cause the chip
to malfunction.
Actions in strong magnetic fields
In applications where the IC may be exposed to back current flow, it is recommended to create a route t dissipate this current
by inserting a bypass diode between the VIN and VOUT pins.
Back current
Ensure a minimum GND pin potential in all operating conditions.
In addition, ensure that no pins other than the GND pin carry a voltage less than or equal to the GND pin, including during
actual transient phenomena.
GND potential
Fig. 34 BH
MA3WHFV
Stable operating region characteristics (Example)
Examples of ceramic capacitor characteristics
0
120
100
80
60
40
20
0
1234
50V tolerance
10V tolerance
Rate
of
change
in
electrostatic
capacitance
(%)
DC bias Vdc (V)
-25
120
100
80
60
40
20
0
025
50
75
Y5V
X7R
X5R
Rate
of
change
in
electrostatic
capacitance
(%)
Temperature ( C)
0
100
95
90
85
80
75
70
1234
50V tolerance
10V tolerance
16V tolerance
Rate
of
change
in
electrostatic
capacitance
(%)
DC bias Vdc (V)
Fig. 29: Capacitance-bias characteristics (Y5V)
Fig. 30: Capacitance-bias characteristics (X5R, X7R)
Fig. 31: Capacitance-temperature characteristics
(X5R, X7R, Y5V)
16V tolerance
Ta=+25 C
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| BH18MA3WHFV-TR | 功能描述:低壓差穩(wěn)壓器 - LDO IC LDO 300MA 1.8V SD RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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