參數(shù)資料
型號(hào)： LMZ10505EXTTZ
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 8.7 A SWITCHING REGULATOR, 1160 kHz SWITCHING FREQ-MAX, PSSO7
封裝： 10.16 X 13.77 MM, 4.57 MM HEIGHT, ROHS COMPLIANT, TO-PMOD, 7 PIN
文件頁(yè)數(shù)： 5/22頁(yè)
文件大?。?/td> 1387K
代理商： LMZ10505EXTTZ
For example, if the master supply voltage V
OUT1 is 3.3V and
the LMZ10505EXT output voltage was 1.8V, then the value
of R
trkb needed to give the two supplies identical soft-start
times would be 14.3 k
. A timing diagram for this example,
the equal soft-start time case, is shown below.
30118359
TRACKING - EQUAL SLEW RATES
Alternatively, the tracking feature can be used to have similar
output voltage ramp rates. This is referred to as simultaneous
startup. In this case, the tracking resistors can be determined
based on the following equation
and to ensure proper overdrive of the SS pin
V
OUT2 < 0.8 x V OUT1
For the example case of V
OUT1 = 5V and VOUT2 = 2.5V, with
R
trkt set to 33 k as before, Rtrkb is calculated from the above
equation to be 15.5 k
. A timing diagram for the case of equal
slew rates is shown below.
30118361
PRE-BIAS STARTUP CAPABILITY
At startup, the LMZ10505EXT is in a pre-biased state when
the output voltage is greater than zero. This often occurs in
many multi-rail applications such as when powering an ASIC,
FPGA, or DSP. The output can be pre-biased in these appli-
cations through parasitic conduction paths from one supply
rail to another. Even though the LMZ10505EXT is a syn-
chronous converter, it will not pull the output low when a pre-
bias condition exists. The LMZ10505EXT will not sink current
during startup until the soft-start voltage exceeds the voltage
on the FB pin. Since the device does not sink current it pro-
tects the load from damage that might otherwise occur if
current is conducted through the parasitic paths of the load.
CURRENT LIMIT
When a current greater than the output current limit (I
OCL) is
sensed, the on-time is immediately terminated and the low
side MOSFET is activated. The low side MOSFET stays on
for the entire next four switching cycles. During these skipped
pulses, the voltage on the soft-start pin is reduced by dis-
charging the soft-start capacitor by a current sink on the soft-
start pin of nominally 14 A. Subsequent over-current events
will drain more and more charge from the soft-start capacitor,
effectively decreasing the reference voltage as the output
droops due to the pulse skipping. Reactivation of the soft-start
circuitry ensures that when the over-current situation is re-
moved, the part will resume normal operation smoothly.
OVER-TEMPERATURE PROTECTION
When the LMZ10505EXT senses a junction temperature
greater than 145°C (typ.), both switching MOSFETs are
turned off and the part enters a standby state. Upon sensing
a junction temperature below 135°C (typ.), the part will re-
initiate the soft-start sequence and begin switching once
again.
13
www.national.com
LMZ10505EXT
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMZ10505EXTTZ/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LMZ10505EXTTZE 制造商:Texas Instruments 功能描述:IC, BUCK, SYNC, ADJ, 5A, TO-PMOD-7 制造商:Texas Instruments 功能描述:IC, BUCK, SYNC, ADJ, 5A, TO-PMOD-7; Primary Input Voltage:5.5V; No. of Outputs:1; Output Current:5A; Voltage Regulator Case Style:TO-PMOD; No. of Pins:7; Operating Temperature Min:-55C; Operating Temperature Max:125C; MSL:MSL 3 - ;RoHS Compliant: Yes
LMZ10505EXTTZE/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LMZ10505EXTTZX 制造商:TI 制造商全稱:Texas Instruments 功能描述:5A SIMPLE SWITCHER?? Power Module with 5.5V Maximum Input Voltage for Military and Rugged Applications
LMZ10505EXTTZX/NOPB 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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