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| 型号： | NCV8881PWR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 23/33页 |
| 文件大小： | 321K |
| 描述： | IC REG TRPL BUCK/LINEAR 16SOIC |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）（1），线性（LDO）（2） |
| 功能： | 车载 |
| 输出数： | 3 |
| 频率 - 开关： | 170kHz |
| 电压/电流 - 输出 1： | 3.3 V ~ 8 V，1.5A |
| 电压/电流 - 输出 2： | 5V，100mA |
| 电压/电流 - 输出 3： | 8.5V，40mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 5 V ~ 19 V |
| 工作温度： | -40°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽）裸露焊盘 |
| 供应商设备封装： | 16-SOIC W |
| 包装： | 标准包装 |
| 其它名称： | NCV8881PWR2GOSDKR |
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NCV8881
http://onsemi.com
23
regulation, a softstart circuit slowly raises the switching
regulator error amplifier reference to V
FBR
in order to avoid
overloading the input supply.
VOLTAGE REFERENCE
An internal, temperature compensated Bandgap voltage
reference provides the SMPS Error Amplifier and the 5P0
and 8P5 linear regulators with a stable, precision reference
voltage.
SMPS ERROR AMPLIFIER
The error amplifier is an operational amplifier. The
Voltage Mode control method employed by the NCV8881
requires Type III compensation for optimum regulator
response to load and line transients.
The output voltage of the error amplifier controls the duty
cycle of the power switch by controlling the moment at
which the power switch shuts off (power switch turnons
occur at a fixed rate).
SMPS OSCILLATOR
With no connections to the ROSC or SYNC pins, the
NCV8881 switching frequency will be the factoryset
default frequency f
OSC
of the internal oscillator.
ROSC SMPS FREQUENCY CONTROL
Connection of a resistor between the ROSC pin and
ground will raise the switching frequency above the
factoryset default according to the following equation.
F
SW
+6840 R
ROSC
0.97
)170
Connection of a resistor between the ROSC pin and 5P0 will
lower the switching frequency below the default. The
programmed switching frequency should be no higher than
the highest synchronization frequency if synchronization is
used.
SMPS SYNCHRONIZATION
Applying a clock signal to the SYNC pin will cause power
switch turnon edges to coincide with rising edges of the
applied clock signal. When synchronization will be
significantly higher than the default frequency, an ROSC
resistor which sets the internal oscillator frequency at (but
no higher than) the synchronization frequency can be used
to maintain the switching frequency approximately the same
as the synchronization frequency in the absence of the
SYNC signal.
Besides controlling the switching frequency, the ROSC
resistor controls the internal ramp slope, and can be used to
adjust the gain of the pulse width modulator.
A steady low or high SYNC input will restore SMPS
operation to the factoryset default or ROSC programmed
frequency after the Desynchronization delay.
OUTPUT VOLTAGE REGULATION MONITOR
When the FB voltage is below V
FBMONL
, RESB is pulled
low, and the POR, BOOT and Watchdog Delays are
initialized. When FB voltage exceeds V
FBMONH
the POR
Delay begins to time out. If, when the FB voltage is below
V
FBMONL
, the SoftStart Timer has expired and the EN
input is low, the NCV8881 will completely shut off (see
Figures 46 through 48).
0
8P5
1
2
3
4
5
6
7
9
10
11
OUTPUT
ENABLE
5P0
VIN
8
SMPS
SOFTSTART TIMER
ShortCircuit Threshold
Current is Limited
Regulation Threshold
Figure 46. SMPS Overload During Startup
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