參數(shù)資料
型號(hào): NCV8881PWR2G
廠商: ON Semiconductor
文件頁(yè)數(shù): 31/33頁(yè)
文件大?。?/td> 321K
描述: IC REG TRPL BUCK/LINEAR 16SOIC
標(biāo)準(zhǔn)包裝: 1
拓?fù)洌?/td> 降壓(降壓)(1),線性(LDO)(2)
功能: 車載
輸出數(shù): 3
頻率 - 開(kāi)關(guān): 170kHz
電壓/電流 - 輸出 1: 3.3 V ~ 8 V,1.5A
電壓/電流 - 輸出 2: 5V,100mA
電壓/電流 - 輸出 3: 8.5V,40mA
帶 LED 驅(qū)動(dòng)器: 無(wú)
帶監(jiān)控器: 無(wú)
帶序列發(fā)生器: 無(wú)
電源電壓: 5 V ~ 19 V
工作溫度: -40°C ~ 150°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)裸露焊盤(pán)
供應(yīng)商設(shè)備封裝: 16-SOIC W
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: NCV8881PWR2GOSDKR
NCV8881
http://onsemi.com
31
I
IN(RMS)
+D
(
1*D
)
 I
SWOUT
)
(
1*D
)
2
 
I
SWOUT
2
)
(1*D)
T
SW
 
V
SWOUT
)V
F
L
2
12
(eq. 7)
Where D is the Duty Cycle = t
ON
/(t
ON
+t
OFF
), and V
F
 is the
forward voltage of the freewheeling diode.
Another consideration for the value of the input capacitor
is the ability to supply enough input charge to satisfy sudden
increases in output current (such as produced at startup, or
upon maximum load step) without an unacceptable drop in
input voltage. This is sometimes important when the input
voltage initially rises past the Undervoltage Lockout
threshold.
SMPS Compensation
The NCV8855 utilizes voltage mode control. The control
loop regulates V
SWOUT
 by monitoring it and controlling the
power switch duty cycle. Inherent with all voltagemode
control loops is a compensation network.
COUT
DFW
VOUT
SWITCH
RAMP
VREF
LOUT
VOLTAGE
ERROR
AMP
VIN
COMP
POWER
ESR
C2
C3
C1
R3
R1
R2
DCR
Figure 58.
The compensation network consists of the internal error
amplifier and the impedance networks Z
IN
 (R1, R3 and C3)
and Z
FB
 (R2, C1 and C2). The compensation network has to
provide a loop transfer function with the highest 0 dB
crossing frequency to have fast response and the highest gain
in DC conditions to minimize the load regulation. The
open-loop gain magnitude versus frequency plot of a stable
control loop crosses zero dB with close to 20 dB/decade
slope and a phase margin greater than 45?/SPAN>.
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