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參數(shù)資料
| 型號： | NCV3063 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 射頻放大器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 269K |
| 代理商： | NCV3063 |
NCP3063, NCP3063B, NCV3063
http://onsemi.com
8
Peak Current Sense Comparator
With a voltage ripple gated converter operating under
normal conditions, output switch conduction is initiated by
the Voltage Feedback comparator and terminated by the
oscillator. Abnormal operating conditions occur when the
converter output is overloaded or when feedback voltage
sensing is lost. Under these conditions, the I
pk
Current Sense
comparator will protect the Darlington output Switch. The
switch current is converted to a voltage by inserting a
fractional ohm resistor, R
SC
, in series with V
CC
and the
Darlington output switch. The voltage drop across R
SC
is
monitored by the Current Sense comparator. If the voltage
drop exceeds 200 mV with respect to V
CC
, the comparator
will set the latch and terminate output switch conduction on
a cyclebycycle basis.
This Comparator/Latch
configuration ensures that the Output Switch has only a
single ontime during a given oscillator cycle.
Real
V
turnoff
on
Rs Resistor
t_delay
I1
Io
di/dt slope
I through the
Darlington
Switch
V
ipk(sense)
The V
IPK(Sense)
Current Limit Sense Voltage threshold is
specified at static conditions. In dynamic operation the
sensed current turnoff value depends on comparator
response time and di/dt current slope.
Real V
turnoff
on Rsc resistor
Vturn_off
Typical I
pk
comparator response time t_delay is 350 ns.
The di/dt current slope is growing with voltage difference on
the inductor pins and with decreasing inductor value.
It is recommended to check the real max peak current in
the application at worst conditions to be sure that the max
peak current will never get over the 1.5 A Darlington Switch
Current max rating.
Vipk(sense)
Rs
(t_delay
di dt)
Thermal Shutdown
Internal thermal shutdown circuitry is provided to protect
the IC in the event that the maximum junction temperature
is exceeded. When activated, typically at 160
°
C, the Output
Switch is disabled. The temperature sensing circuit is
designed with 10
°
C hysteresis. The Switch is enabled again
when the chip temperature decreases to at least 150
°
C
threshold.
This feature is provided to prevent
catastrophic
failures
from
overheating. It is not intended to be used as a
replacement for proper heatsinking.
accidental
device
Output Switch
The output switch is designed in a Darlington
configuration. This allows the application designer to
operate at all conditions at high switching speed and low
voltage drop. The Darlington Output Switch is designed to
switch a maximum of 40 V collector to emitter voltage and
current up to 1.5 A.
APPLICATIONS
Figures 14 through 22 show the simplicity and flexibility
of the NCP3063. Three main converter topologies are
demonstrated with actual test data shown below each of the
circuit diagrams.
Figure 13 gives the relevant design equations for the key
parameters. Additionally, a complete application design aid
for the NCP3063 can be found at www.onsemi.com.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| NCV3063DR2G | 功能描述:直流/直流開關轉(zhuǎn)換器 1.5 A DCDC SW REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| NCV3063MNTXG | 功能描述:直流/直流開關轉(zhuǎn)換器 SWITCHING REGULATOR 1.5A 150kHz RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| NCV3063PG | 功能描述:直流/直流開關轉(zhuǎn)換器 1.5 A DCDC SW REG RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率: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 安裝風格:SMD/SMT |
| NCV3064 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.5 A, Step-Up/Down/ Inverting Switching Regulator with ON/OFF Function |
| NCV3064B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:1.5 A, Step-Up/Down/ Inverting Switching Regulator with ON/OFF Function |
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