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參數(shù)資料
| 型號(hào)： | NCV8881PWR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 29/33頁 |
| 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 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 無 |
| 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 |
| 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 |
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NCV8881
http://onsemi.com
29
WATCHDOG STUCK HIGH; ENABLE = LOW, THEN EN = HIGH RESTARTS
3.3V
WDI STUCK HIGH
NORMAL RESPONSE
5V
0
WDI
1
2
3
4
5
6
7
9
10 11 12
RESB
ENABLE
VIN
8
13 14 15 16
WATCHDOG
DELAY
DELAY
POR
BOOT DELAY
DELAY
POR
BOOT DELAY
NORMAL RESPONSE
Figure 56. Watchdog Stuck HIGH, EN Input LOW; then EN Goes HIGH to Restart the Regulators
0
SMPS OUTPUT OUT OF REGULATION TO RESB LOW DELAY
VFBMONL
1
2
3
4
5
6
7
9
10
11
12
RESB
3.3V
THRESHOLD
8
tFBLDLY
13
14
Figure 57. RESB Pulled Low as the SMPS Output Voltage (pullup source for RESB) Drops Out of Regulation
APPLICATION INFORMATION
Input Capacitors
The primary input capacitor should be a ceramic of at least
4.7 mF placed between the VIN pin and the ground terminal
of the SMPS freewheeling diode in order to reduce input
voltage perturbations present when the NCV8881 SMPS is
heavily loaded. A secondary 0.1 mF ceramic capacitor
positioned as closely as possible between the VIN and GND
pins of the NCV8881 provides greater reduction of input
perturbations than further increasing the value of the
primary ceramic capacitor, and can be more effectively
positioned than the larger 4.7 mF capacitor without
compromising PCB thermal conductivity.
LDO Output Capacitor Selection
The LDOs have been compensated to work with output
capacitors above 3.3 mF having an ESR from 200 mW up to
5 W over the full range of output current and temperature.
Lower capacitance and ESR can be used for lighter load
requirements. Tantalum, Aluminum or Polymer
Electrolytic, capacitors can be used. Ceramic capacitors
should have series resistance added to be within the
recommended ESR range. There are many capacitor
vendors which supply automotive rated parts that fall within
these ranges. For example, the SUNCON EPseries
Aluminum Electrolytic capacitors are well suited well for
automotive radio applications.
Setting the SMPS Output Voltage
To set the output voltage of the switching regulator, use
the following equation:
V
SWOUT
+V
REF
1)
R1
R2
(eq. 1)
where V
REF
is the Reference voltage, R1 is the resistor
connected from V
SWOUT
to the FB pin and R2 is the resistor
connected from the FB pin to ground. To reduce the effect
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