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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： | 22/22页 |
| 文件大小： | 200K |
| 代理商： | L5993D |
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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