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參數(shù)資料
| 型號： | L5989D |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | ROHS COMPLIANT, HTSSOP-16 |
| 文件頁數(shù)： | 10/51頁 |
| 文件大小： | 1947K |
| 代理商： | L5989D |
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Functional description
L5989D
18/51
Doc ID 15778 Rev 3
During normal operation the CSS is discharged with a constant current of 22 μA (typ.) only if:
●
HICCUP mode is triggered (see Chapter 5.5.2)
●
the input voltage goes below the UVLO threshold (see Chapter 5.5.3)
●
the internal temperature is over 150°C (see Chapter 5.5.4)
A new SS cycle will start when the VSS drops below the INH threshold.
New high performance ICs often require more than one supply voltage. Most of these
applications require well defined start-up sequencing, in order to avoid potential damage
and latch-up of the processing core. Sharing the same soft-start capacitor for a set of
regulators, the output voltages increase with the same slew rate implementing a
“simultaneous start-up” sequencing method.
5.5
Monitoring and protections
5.5.1
Overvoltage
The device provides the overvoltage protection monitoring the output voltage through the FB
pin. If the voltage sensed on FB pin reaches a value 20% (typ.) greater than the reference of
the error amplifier, the low-side MOSFET is turned on to discharge as fast as possible the
output capacitor. It is possible to set two different behaviors in case of OVP:
●
In case the OVP latched mode is active (see Chapter 5.1), the internal oscillator is
suspended and the low side switch will be kept on until the input voltage goes below the
selected UVLO threshold or the SS/INH pin is forced below the INH threshold.
●
In case of NOT latched OVP mode is active, the low side MOS is forced ON until the
feedback voltage is higher than the OVP threshold (20% greater than the reference of
the error amplifier).
Figure 8.
OVP not latched
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| L5989DTR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A cont 5A pulsed step-down sw RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| L5991 | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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| L5991A | 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L5991AD | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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