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| 型号： | NCV8855BMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG QD BUCK/LINEAR 40QFN |
| 标准包装： | 1 |
| 拓扑： | 降压（降压）（2），线性（LDO）（2） |
| 功能： | 汽车无线电设备和仪表板电源 |
| 输出数： | 4 |
| 频率 - 开关： | 170kHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 可调式，2.5A |
| 电压/电流 - 输出 3： | 控制器 |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 是 |
| 电源电压： | 9 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 标准包装 |
| 其它名称： | NCV8855BMNR2GOSDKR |
NCV8855
I LIMIT
I LIMIT(LDO) +
controlled by the soft ? start circuit make dt limit v T SS1 ,
where T SS1 is the soft ? start time and dt limit is equal to:
COUT1 * VOUT1
(eq. 3)
Overcurrent Protection (SMPS2)
The current limit for SMPS2 is internally set at 3.05 A
(typ). The operation is similar to SMPS1 in that it
immediately ends the pulse upon overcurrent detection. This
repeats every cycle until the overcurrent condition is
removed. Similar to SMPS1, the over current protection
circuitry is active upon startup.
As with SMPS1, short circuit protection is implemented
with a comparator monitoring the feedback. If the output
voltage goes below 70% of nominal after start ? up, the part
is latched off, requiring SYS_EN to be toggled to restart the
part.
Overcurrent Protection (LDO1 and LDO2)
There are two overcurrent protection circuits
incorporated; one provides a current limit feature, the other
provides a short circuit protection feature. Under normal
operation, the current is sensed through a sense resistor
connected to ISNS[x]+ and ISNS[x] ? and limited by the
equation:
V SNS[x]
(eq. 4)
R SNS[x]
where, R SNS[x] is the sense resistor for LDO1 and LDO2,
and V SNS[x] is the current limit threshold. To calculate
R SNS[x] , the minimum V SNS[x] value and the maximum
operating current should be used.
To thermally protect the pass device during a short circuit
event, a comparator monitoring the feedback voltage is
incorporated. If the output voltage goes below 70% of
nominal (typ), the LDO will latch off. This is an independent
operation, meaning, a short circuit on one LDO does not
affect the operation of the other, nor does it affect the SMPS
or high ? side switch. An LDO_EN toggle is required to
re ? start an LDO if it latched off due to a short circuit event.
In addition, the current limit should be chosen such that
the output voltage will rise to greater than 70% of the final
VOUT within 2.74 ms in order to keep the short ? circuit
circuit from falsely tripping.
Overcurrent Protection (High ? Side Load Switch)
There are two primary protection features of the internal
high ? side 2.8 A (typ.) current limit. The first protection
involves a short circuit condition during startup, and the
second involves an overload condition after startup.
During startup, if the output does not exceed 4.5 V (typ.)
in 1.5 ms (typ.), the device is considered to be in a “hard”
short circuit condition, and is latched off. In addition, if the
device does not exceed VIN ? 3.75 V (typ.) in 3 ms (typ), the
device is considered to be in a “soft” short circuit condition,
and is latched off. Furthermore, if V HS_S goes below VIN ?
3.75 V (typ), during normal operation, for more than 3 ms
(typ), the device is considered to be in a “soft” short circuit
condition, and is latched off. Once the high ? side switch has
been latched off, a HS_EN toggle will be required to reset
it.
Overvoltage Clamp (High ? Side Load Switch)
The source output of the high ? side switch is clamped
during a high battery condition. This protects any load
connected to the source from seeing a double battery or load
Supply
output
ISNS [x ]+
ISNS [x] ?
LR _ G[x]
LR _ FB [x]
ILIMIT
EA
VREF
dump condition. If the input rises above 16 V (typ), the
internal gate of the high ? side switch will be pulled low to
keep the source from rising. The high ? side switch will
operate in this linear mode until the input voltage exceeds
18.5 V (typ) at which point the entire IC will shutdown.
SCP
70% VREF
Figure 21.
APPLICATION INFORMATION
V OUT[x] + V REF 1 )
R1
Setting the Output Voltage
To set the output voltage of any of the controllers or
regulators, use the following equation:
(eq. 5)
R2
where, R1 is the resistor that is connected from VOUT[x]
to the feedback pin of its respective channel and R2 is
connected from that feedback pin to ground. To reduce the
effect of input offset current error, it is customary to
calculate R1 with R2 equal to 1 k W .
LDO1 and LDO2 Pass Device Selection
The LDO controllers have been optimized to give the best
performance with the NTD20P06L p ? channel MOSFET.
While other p ? channel MOSFET can be used, specifications
in the electrical table are guaranteed only with the
NTD20P06L, and using a different MOSFET may require
external compensation to stabilize the output. The
NTD20P06L can be used as the pass device for both
controllers, and is rated with a ? 60 V max V DS. This device
comes in two different packages allowing great flexibility
http://onsemi.com
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCV8855BMNR2GEVB | 功能描述:电源管理IC开发工具 SMPS ASIC RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| NCV8870 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
| NCV887000D1R2G | 功能描述:低压差稳压器 - LDO Auto Grade Non-Sync Boost Controller RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| NCV887001 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Automotive Grade Non-Synchronous Boost Controller |
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