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参数资料
| 型号： | LMZ10504EXTTZX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 6.7 A SWITCHING REGULATOR, 1160 kHz SWITCHING FREQ-MAX, PSSO7 |
| 封装： | 10.16 X 13.77 MM, 4.57 MM HEIGHT, ROHS COMPLIANT, TO-PMOD, 7 PIN |
| 文件页数： | 4/22页 |
| 文件大小： | 1383K |
| 代理商： | LMZ10504EXTTZX |
Additional Features
Enable
The LMZ10504EXT features an enable (EN) pin and associ-
ated comparator to allow the user to easily sequence the
LMZ10504EXT from an external voltage rail, or to manually
set the input UVLO threshold. The turn-on or rising threshold
and hysteresis for this comparator are typically 1.23V and
0.15V respectively. The precise reference for the enable com-
parator allows the user to guarantee that the LMZ10504EXT
will be disabled when the system demands it to be.
The EN pin should not be left floating. For always-on opera-
tion, connect EN to VIN.
Enable and UVLO
Using a resistor divider from VIN to EN as shown in the
schematic diagram below, the input voltage at which the part
begins switching can be increased above the normal input
UVLO level according to
For example, suppose that the required input UVLO level is
3.69V. Choosing R
enb = 10 k, then we calculate Rent = 20
k
.
30118444
Alternatively, the EN pin can be driven from another voltage
source to cater to system sequencing requirements common-
ly found in FPGA and other multi-rail applications. The fol-
lowing schematic shows an LMZ10504EXT that is sequenced
to start based on the voltage level of a master system rail
(V
OUT1).
30118445
Soft-Start
The LMZ10504EXT begins to operate when both the VIN and
EN, voltages exceed the rising UVLO and enable thresholds,
respectively. A controlled soft-start eliminates inrush currents
during startup and allows the user more control and flexibility
when sequencing the LMZ10504EXT with other power sup-
plies.
In the event of either VIN or EN decreasing below the falling
UVLO or enable threshold respectively, the voltage on the
soft-start pin is collapsed by discharging the soft-start capac-
itor by a 14 A (typ.) current sink to ground.
Soft-Start Capacitor
Determine the soft-start capacitance with the following rela-
tionship
where V
FB is the internal reference voltage (nominally 0.8V),
I
SS is the soft-start charging current (nominally 2 A) and
C
SS is the external soft-start capacitance.
Thus, the required soft-start capacitor per unit output voltage
startup time is given by
C
SS = 2.5 nF / ms
For example, a 4 ms soft-start time will yield a 10 nF capaci-
tance. The minimum soft-start capacitance is 680 pF.
Tracking
The LMZ10504EXT can track the output of a master power
supply during soft-start by connecting a resistor divider to the
SS pin. In this way, the output voltage slew rate of the
LMZ10504EXT will be controlled by a master supply for loads
that require precise sequencing. When the tracking function
is used, a small value soft-start capacitor should be connect-
ed to the SS pin to alleviate output voltage overshoot when
recovering from a current limit fault.
30118457
www.national.com
12
LMZ10504EXT
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LMZ10504EXTTZX/NOPB | 功能描述:直流/直流开关转换器 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 |
| LMZ10504TZ-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4A SIMPLE SWITCHER?Power Module with 5.5V Maximum Input Voltage |
| LMZ10504TZ-ADJ/NOPB | 功能描述:直流/直流开关转换器 5V,4A PWR MODULE 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 |
| LMZ10504TZE-ADJ | 制造商:NSC 制造商全称:National Semiconductor 功能描述:4A SIMPLE SWITCHER?Power Module with 5.5V Maximum Input Voltage |
| LMZ10504TZE-ADJ/NOPB | 功能描述:直流/直流开关转换器 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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