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参数资料
| 型号： | E-L6917BD |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | ROHS COMPLIANT, SO-28 |
| 文件页数： | 6/33页 |
| 文件大小： | 465K |
| 代理商： | E-L6917BD |
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L6917B
14/33
Output Voltage Protection and Power Good
The output voltage is monitored by pin VSEN. If it is not within +12/-10% (typ.) of the programmed value, the
powergood output is forced low. Power good is an open drain output and it is enabled only after the soft start is
finished (2048 clock cycles after start-up).
The device provides over voltage protection; when the voltage sensed by the VSEN pin reaches 2.1V (typ.), the
controller permanently switches on both the low-side mosfets and switches off both the high-side mosfets in or-
der to protect the CPU. The OSC/INH/FAULT pin is driven high (5V) and power supply (Vcc) turn off and on is
required to restart operations. The over Voltage percentage is set by the ratio between the OVP threshold (set
at 2.1V) and the reference programmed by VID.
Under voltage protection is also provided. If the output voltage drops below the 60% of the reference voltage for
more than one clock period the device turns off and the FAULT pin is driven high.
Both Over Voltage and Under Voltage are active also during soft start (Under Voltage after than Vout reaches
0.8V). During soft-start the reference voltage used to determine the OV and UV thresholds is the increasing volt-
age driven by the 2048 soft start digital counter.
Remote Voltage Sense
A remote sense buffer is integrated into the device to allow output voltage remote sense implementation without
any additional external components. In this way, the output voltage programmed is regulated between the re-
mote buffer inputs compensating motherboard trace losses or connector losses if the device is used for a VRM
module. The very low offset amplifier senses the output voltage remotely through the pins FBR and FBG (FBR
is for the regulated voltage sense while FBG is for the ground sense) and reports this voltage internally at VSEN
pin with unity gain eliminating the errors.
If remote sense is not required, the output voltage is sensed by the VSEN pin connecting it directly to the output
voltage. In this case the FBG and FBR pins must be connected anyway to the regulated voltage.
Input Capacitor
The input capacitor is designed considering mainly the input rms current that depends on the duty cycle as re-
ported in figure 8. Considering the dual-phase topology, the input rms current is highly reduced comparing with
a single phase operation.
Figure 8. Input rms Current vs. Duty Cycle (D) and Driving Relationships
It can be observed that the input rms value is one half of the single-phase equivalent input current in the worst
case condition that happens for D = 0.25 and D = 0.75.
OVP[%]
2.1V
Refer enc e Volt age VI D
()
---------------------------------------------------------------------------- - 100
=
0.50
0.75
0.25
0.50
0.25
Single Phase
Dual Phase
Duty Cycle (VOUT/VIN)
Rms
Current
Normalized
(I
RMS
/I
OUT
)
>
<
=
0.5
D
if
D)
2
(2
1)
-
(2D
2
OUT
I
5
.
0
D
if
D)
2
(1
2D
2
OUT
I
rms
I
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相关代理商/技术参数 |
参数描述 |
|---|---|
| E-L6917BDTR | 功能描述:DC/DC 开关控制器 Prog Dual-Phase Cont RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| E-L6919E | 功能描述:电流型 PWM 控制器 5-Bit Dual Ph Contlr 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 |
| E-L6919ETR | 功能描述:电流型 PWM 控制器 5-Bit Dual Ph Contlr 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 |
| E-L6920D | 功能描述:直流/直流开关转换器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| E-L6920DTR | 功能描述:直流/直流开关转换器 0.6 to 5.5V Step-Up RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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