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参数资料
| 型号： | L5993D |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 5/22页 |
| 文件大小： | 200K |
| 代理商： | L5993D |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5993D013TR | 功能描述:开关变换器、稳压器与控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L5994 | 功能描述:电流型 PWM 控制器 Adj Triple Out Pwr RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| L5994_02 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:ADJUSTABLE TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| L5994A | 功能描述:监控电路 ADJT TRIPLE OUTPUT POWER SUPPLY CNTLR RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| L5995 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Current-Mode SMPS Controller |
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