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參數(shù)資料
| 型號(hào)： | 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)： | 5/22頁 |
| 文件大?。?/td> | 200K |
| 代理商： | L5993 |
Pin 16. C-POWER (Constant Power Function).
An external capacitor connected between this pin
and SGND completes the peak-holding circuit that
detects the peak voltage of the synchronized os-
cillator. The circuit gets a DC voltage (which de-
creases as the synchronizing frequency fed into
pin 1 (SYNC) rises) used to clamp the error ampli-
fier output (VCOMP), as shown in the detailed inter-
nal schematic of fig. 30.
In this way the pulse-by-pulse setpoint is moved
downwards as the frequency rises (and vice versa for
a frequency decrease, due to the 47k
dischargere-
sistor) and, as a result, the maximum power deliver-
ableto the load is held roughly constant.
The external capacitor must be large enough to
get a real DC voltage on the pin. Considering the
spread of the internal 47k
resistor, the minimum
capacitance value (CCP) needed to have less than
1% ripple superimposed on the DC voltage is:
CCP
>
1
330
min
,
where
min (Hz) is the minimum synchronizing fre-
quency.
When this function is not used, pin 16 has to be
connected directly to pin 4.
Considering the ordinary design criteria for the
transformer, the circuit usually works well without
any adjustment. Anyway, the variations of the
maximum power limit on varying the switching fre-
quency and/or the mains voltage can be mini-
mized by modifying one or more of the following
parameters:
- Primary inductance;
- Transformer turns ratio;
- Oscillator free-running frequency;
- Sense resistor.
A trial process is required, involving the parame-
ters that are more practicable to modify. In fact,
the optimum behavior is achieved for a specific
combination of the above parameters and de-
V15=GND
V5=V13=GND
V15=VREF
V5=V13=GND
td
tc
V2
V10
V2
V10
DX =
tc
tc +td
DX =
tc
2tc +td
D97IN498
Figure 29. Half duty cycle option.
E/A
RT
-
+
2.5V
-
+
VFB
5
COMP
6
30K
30K
Q2
Q1
D2
4
VREF
C-POWER
16
CCP
BUFFER
-
+
47K
D1
CT
2
RCT
15K
TIMING
CLAMP
1V
PWM
COMPARATOR
TO PWM
LATCH
L5993
113
SYNC
ISEN
D97IN768A
Figure 30. Constant Power circuit internal schematic
L5993
13/22
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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(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 |
| 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(cè)電壓數(shù): 監(jiān)測(cè)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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