參數(shù)資料
型號(hào)： L5991D
廠(chǎng)商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： SO-16
文件頁(yè)數(shù)： 5/23頁(yè)
文件大小： 414K
代理商： L5991D
connecting DC-LIM to VREF (half duty cycle op-
tion), Dx will be set approximately at:
Dx
RT
2
RT + 260
(11)
and the output switching frequency will be halved
with respect to the oscillator one because an in-
ternal T flip-flop (see block diagram) is activated.
Fig. 31 shows the operation.
The half duty cycle option speeds up the dis-
charge of the timing capacitor CT (in order to get
duty cycles as close to 50% as possible) so the
oscillator frequency - with the same timing compo-
nents will be slightly higher.
Pin 16. S-BY (Standby Function). The resistor RB,
along with RA, sets the operating frequency of the
oscillator in normal operation (fosc). In fact, as long
as the STANDBY signal is high, the pin is inter-
nally connected to the reference voltage VREF by
a N-channel FET (see fig. 32), so the timing ca-
pacitor CT is charged through RA and RB. When
the STANDBY signal goes low the N-channel FET
is turned off and the pin becomes floating. RB is
+
-
C
D97IN502
DIS
D
R
Q
DISABLE
UVLO
2.5V
14
DISABLE
SIGNAL
Figure 30. Disable (Latched).
V15=GND
V5=V13=GND
V15=VREF
V5=V13=GND
td
tc
V2
V10
V2
V10
DX =
tc
tc + td
DX =
tc
2 tc + td
D97IN498
Figure 31. Half duty cycle option.
-
+
-
+
2.5
2.5/4
R
STANDBY
10V
LEVEL SHIFT
COMP
FB
VREF
ST-BY
4
16
6
RCT
CT
RA
RB
2
5
LOW
HIGH
STANDBY
D97IN752B
VT1
2.5V
VT2
4V
VCOMP
-
+
ISEN
13
R
DRIVER
OUT
STANDBY BLOCK
2R
Figure 32. Standby function internal schematic and operation.
L5991 - L5991A
13/23
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PDF描述
L5991AD13TR 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
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L5993D013TR 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L5991D013TR 功能描述:電流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 開(kāi)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
L5993 功能描述:開(kāi)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(kāi)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
L5993D 功能描述:開(kāi)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(kāi)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
L5993D013TR 功能描述:開(kāi)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(kāi)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
L5994 功能描述:電流型 PWM 控制器 Adj Triple Out Pwr RoHS:否 制造商:Texas Instruments 開(kāi)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
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