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| 型号： | XRP7714ILB-F |
| 厂商： | Exar Corporation |
| 文件页数： | 19/29页 |
| 文件大小： | 1009K |
| 描述： | IC REG 5OUT BCK/LINEAR 40TQFN |
| 产品培训模块： | Powering VLSI Based Systems |
| 特色产品： | XRP7714 PWM Step-Down DC/DC Controller |
| 标准包装： | 490 |
| 系列： | PowerXR |
| 拓扑： | 降压（降压）同步（4），线性（LDO）（1） |
| 功能： | 任何功能 |
| 输出数： | 5 |
| 频率 - 开关： | 1.5MHz |
| 电压/电流 - 输出 1： | 控制器 |
| 电压/电流 - 输出 2： | 控制器 |
| 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： | 4.75 V ~ 25 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN（6x6） |
| 包装： | 托盘 |
| 配用： | 1016-1350-ND - EVAL BAORD FOR XRP7714 1016-1344-ND - IN-SOCKET PROG BRD VIA USB/GUI |
| 其它名称： | 1016-1351 |
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?2011 Exar Corporation
19/29
Rev. 1.1.6
SOFT-STOP
The SET_PD_FALL_CHx register is a 16 bit register. This register specifies the soft-stop delay and
ramp (fall-time) characteristics for when the chip receives a channel disable indication from the
Host to shutdown the channel.
Bits [15:10] specify the delay after disabling a channel but before starting the shutdown of the
channel; where each bit represents 250祍 steps. Bits [9:0] specify the fall time of the channel;
these 10 bits define the number of microseconds for each 50mV increment to reach the discharge
threshold.
DELAY
Fall Time
Bit [10:15]
Bit [0:9]
Vout
Enable
Signal
PD_DELAY_CHx
REGISTER
Fig. 25: Channel Soft-Stop Sequence
POWER GOOD FLAG
The XRP7714 allows the user to set the upper and lower bound for a power good signal per
channel. The SET_PWRG_TARG_MAX_CHx register sets the upper bound, the
SET_PWRG_TARG_MIN_CHx register sets the lower bound. Each register has a 20mV LSB
resolution. When the output voltage is within bounds the power good signal is asserted high.
Typically the upper bound should be lower than the over-voltage threshold. In addition, the power
good signal can be delayed by a programmable amount set in the SET_PWRGD_DLY_CHx register.
The power good delay is only set after the soft-start period is finished. If the channel has a pre-
charged condition that falls into the power good region, a power good flag is not set until the soft-
start is finished.
PWM SWITCHING FREQUENCY
The PWM switching frequency is set by choosing the corresponding oscillator frequency and clock
divider ratio in the SET_SW_FREQUENCY register. Bits [6:4] set the oscillator frequency and bits
[2:0] set the clock divider. The tables below summarize the available Main Oscillator and PWM
switching frequency settings in the XRP7714.
Main Oscillator Frequency
SET_SW_FREQUENCY[6:4]
000
001
010
011
100
101
110
111
M in
ill r Fr
n
48MHz 44.8MHz 41.6MHz 38.4MHz 35.2MHz 32MHz 28.8Mhz 25.6MHz
T
20.8ns 22.3ns
24ns
26ns
28.4ns 31.25ns 34.7ns
39ns
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP7714ILBTR-0X10-F | 制造商:EXAR 制造商全称:EXAR 功能描述:Quad Channel Digital PWM Step Down Controller |
| XRP7714ILBTR-0X14-F | 制造商:EXAR 制造商全称:EXAR 功能描述:Quad Channel Digital PWM Step Down Controller |
| XRP7714ILBTR-0X18-F | 制造商:EXAR 制造商全称:EXAR 功能描述:Quad Channel Digital PWM Step Down Controller |
| XRP7714ILBTR-0X1C-F | 制造商:EXAR 制造商全称:EXAR 功能描述:Quad Channel Digital PWM Step Down Controller |
| XRP7714ILBTR-F | 功能描述:直流/直流开关调节器 4Ch Dgtl Pwr Cntrllr w/LDO prog thru PC RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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