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参数资料
| 型号： | L5991AD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SO-16 |
| 文件页数： | 5/23页 |
| 文件大小： | 414K |
| 代理商： | L5991AD |
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| L5991AD13TR | 功能描述:电流型 PWM 控制器 Prog Current Mode 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 |
| L5991D | 功能描述:电流型 PWM 控制器 Prog Current Mode 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 |
| L5991D013TR | 功能描述:电流型 PWM 控制器 Prog Current Mode 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 |
| L5993 | 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 |
| L5993D | 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 |
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