參數(shù)資料
型號： L5988D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁數(shù)： 4/52頁
文件大?。?/td> 1858K
代理商： L5988D
Functional description
L5988D
12/52
Doc ID 15324 Rev 3
5
Functional description
The L5988D is based on a voltage mode control loop. Therefore the duty ratio of the internal
switch is obtained through a comparison between a saw-tooth waveform (generated by an
oscillator) and the output voltage of the error amplifier as shown in Figure 3. The advantage
of this technique is the very short conduction time of the power elements thanks to the
proper operation of the control loop without a precise current sense, which instead is
required in current mode regulators. Thanks to this architecture the L5988D supports
extremely low conversion ratio (D = VOUT/VIN) even at very high switching frequency
(up to 1 MHz).
Figure 3.
Voltage mode control loop
The main internal blocks are represented in Figure 4.
Figure 4.
Internal block diagram
+
-
+
-
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
+
-
+
-
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
+
-
+
-
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
+
-
+
-
V
REF
E/A
PWM
VOUT
OSCILLATOR RAMP
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5988DTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 4A Step Down Reg 2.9V to 18V 200ns 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
L5989D 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
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(shí)間: 下降時(shí)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
L5991_01 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY
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