參數(shù)資料
型號(hào)： NCP1014ST65T3
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS
中文描述： 1 A SWITCHING REGULATOR, 71 kHz SWITCHING FREQ-MAX, PSSO4
封裝： PLASTIC, SOT-223, 4 PIN
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 324K
代理商： NCP1014ST65T3
NCP1010, NCP1011, NCP1012, NCP1013, NCP1014
http://onsemi.com
10
Figure 14. The Charge/Discharge Cycle Over a 10 F V
CC
Capacitor
Vcc
8.5 V
7.5 V
Device
Internally
Pulses
Startup Period
8.00
6.00
4.00
2.00
0
The protection burst dutycycle can easily be computed
through the various timing events as portrayed by Figure 16.
Being loaded by the circuit consumption, the voltage on
the V
CC
capacitor goes down. When the DSS controller
detects that V
CC
has reached 7.5 V (VCC
ON
), it activates the
internal current source to bring V
CC
toward 8.5 V and stops
again: a cycle takes place whose low frequency depends on
the V
CC
capacitor and the IC consumption. A 1.0 V ripple
takes place on the V
CC
pin whose average value equals
(VCC
OFF
+ VCC
ON
)/2. Figure 14 portrays a typical
operation of the DSS.
As one can see, the V
CC
capacitor shall be dimensioned to
offer an adequate startup time, i.e. ensure regulation is
reached before V
CC
crosses 7.5 V (otherwise the part enters
the fault condition mode). If we know that V = 1.0 V
and ICC1 (max) is 1.1 mA (for instance we selected an 11
device switching at 65 kHz), then the V
CC
capacitor can
ICC1 · tstartup
be calculated using:
C
suppose that the SMPS needs 10 ms to startup, then we will
calculate C to offer a 15 ms period. As a result, C should be
greater than 20 F thus the selection of a 33 F/16 V
capacitor is appropriate.
V
(eq. 1)
. Let’s
Short Circuit Protection
The internal protection circuitry involves a patented
arrangement that permanently monitors the assertion of an
internal error flag. This error flag is, in fact, a signal that
instructs the controller that the internal maximum peak
current limit is reached. This naturally occurs during the
startup period (Vout is not stabilized to the target value) or
when the optocoupler LED is no longer biased, e.g. in a
shortcircuit condition or when the feedback network is
broken. When the DSS normally operates, the logic checks
for the presence of the error flag every time V
CC
crosses
VCC
ON
. If the error flag is low (peak limit not active) then
the IC works normally. If the error signal is active, then the
NCP101X immediately stops the output pulses, reduces its
internal current consumption and does not allow the startup
source to activate: V
CC
drops toward ground until it reaches
the socalled latchoff level, where the current source
activates again to attempt a new restart. When the error is
gone, the IC automatically resumes its operation. If the
default is still there, the IC pulses during 8.5 V down to 7.5 V
and enters a new latchoff phase. The resulting burst
operation guarantees a low average power dissipation and
lets the SMPS sustain a permanent shortcircuit. Figure 15
shows the corresponding diagram.
Figure 15. Simplified NCP101X ShortCircuit
Detection Circuitry
+
4 V
FB
Division
Max
Ip
Flag
V
CC
VCC
ON
Signal
To
Latch
Reset
Current Sense
Information
Clamp
Active
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NCP1014ST65T3G 功能描述:電流型 PWM 控制器 Low Standby Power Monolithic Switcher RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1014STBUCGEVB 功能描述:電源管理IC開(kāi)發(fā)工具 POSITIVE OUTPUT BUCK EVB RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
NCP1015 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Self-Supplied Monolithic Switcher for Low Standby- Power Offline SMPS
NCP1015_11 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Self-Supplied Monolithic Switcher for Low Standby-Power Offline SMPS
NCP1015AP065G 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 SELF-SUPPLIED MONOLITHIC SWITCHER RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開(kāi)關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel
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