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參數(shù)資料
| 型號： | L5993 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封裝： | DIP-16 |
| 文件頁數(shù)： | 22/22頁 |
| 文件大?。?/td> | 200K |
| 代理商： | L5993 |
ered at pin 1 and defines the upper extreme of the
duty cycle range, Dx (see pin 15 for Dx definition
and calculation).
In case V15 is connecte d to VREF, however, the
switching frequency of the system will be a half
fosc.
If the IC is to be synchronized to an external oscil-
lator, RT and CT should be selected for a fosc
lower than the master frequency in any condition
(typically, 10-20% ), depending on the tolerance
of RT and CT .
Pin 3. DC (Duty Cycle Control). By biasing this
pin with a voltage between 1 and 3 V it is possible
to set the maximum duty cycle between 0 and the
upper extreme Dx (see pin 15).
If Dmax is the desired maximum duty cycle, the
voltage V3 to be applied to pin 3 is:
V3 =5 - 2
(2-Dmax)
(4)
Dmax is determined by internal comparison be-
tween V3 and the oscillator ramp (see fig. 22),
thus in case the device is synchronized to an ex-
ternal frequency fext (and therefore the oscillator
amplitude is reduced), (4) changes into:
V3
= 5 4
exp
Dmax
RT
CT fext
(5)
A voltage below 1V will inhibit the driver output
stage. This could be used for a not-latched device
disable, for example in case of overvoltage pro-
tection (see application ideas).
If no limitation on the maximum duty cycle is re-
quired (i.e. DMAX =DX), the pin has to be left float-
ing. An internal pull-up (see fig. 22) holds the volt-
age above 3V. Should the pin pick up noise (e.g.
during ESD tests), it can be connected to VREF
through a 4.7k
resistor.
Pin 4. VREF (Reference Voltage). The device is
provided with an accurate voltage reference
(5V
±1.5%) able to deliver some mA to an external
circuit.
A small film capacitor (0.1
F typ.), connected
between this pin and SGND, is recommended to
ensure the stability of the generator and to prevent
noise from affectingthe reference.
Before device turn-on, this pin has a sink current
capability of 0.5mA.
+
-
R2
R3
R1
CLAMP
D1
50
RT
CT
D
R
Q
600
A
D97IN500B
VREF
RCT
SYNC
CLK
2
4
1
Figure 21. Oscillator and synchronization internal schematic.
+
-
R2
R1
RT
C
T
D97IN711A
VREF
RCT
DC
TO PWM LOGIC
4
3
2
23K
28K
3
A
Figure 22. Duty cycle control.
L5993
9/22
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L5993D | 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 |
| L5993D013TR | 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 |
| L5994 | 功能描述:電流型 PWM 控制器 Adj Triple Out Pwr 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 |
| L5994_02 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994A | 功能描述:監(jiān)控電路 ADJT TRIPLE OUTPUT POWER SUPPLY CNTLR RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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