X
X
R
R
P
P
7
7
7
7
1
1
4
4
Q
Q
u
u
a
a
d
d
C
C
h
h
a
a
n
n
n
n
e
e
l
l
D
D
i
i
g
g
i
i
t
t
a
a
l
l
P
P
W
W
M
M
S
S
t
t
e
e
p
p
D
D
o
o
w
w
n
n
C
C
o
o
n
n
t
t
r
r
o
o
l
l
l
l
e
e
r
r
?2011 Exar Corporation
18/29
Rev. 1.1.6
Over-Current Fault Handling
When an over-current condition occurs, PWM drivers in the corresponding channels are disabled.
After a 200ms timeout, the controller is re-powered and soft-start is initiated. When the over-
current condition is reached the controller will check the SET_FAULT_RESP_CONFIG_LB and
SET_FAULT_RESP_CONFIG_HB to determine whether there are any following channels that need
to be similarly restarted. The controller will also set the fault flags in READ_OVC_FAULT_WARN
register.
Typically the over-current fault threshold would be set to 130-140% of the maximum desirable
output current. This will help avoid any over-current conditions caused by transients that would
shut down the output channel.
CHIP OPERATION AND CONFIGURATION
SOFT-START
The SET_SS_RISE_CHx register is a 16 bit register which specifies the soft-start delay and the
ramp characteristics for a specific channel. This register allows the customer to program the
channel with a 250祍 step resolution and up to a maximum 16ms delay.
Bits [15:10] specify the delay after enabling a channel but before outputting pulses; where each bit
represents 250祍 steps. Bits [9:0] specify the rise time of the channel; these 10 bits define the
number of microseconds for each 50mV increment to reach the target voltage.
Enable
Signal
Vout
SS_RISE_CHx
REGISTER
Bit [0:9]
RISE TIME
DELAY
Bit [10:15]
Fig. 24: Channel Power Up Sequence
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
XRP7740ILB-0X18-F
IC REG 5OUT BCK/LINEAR 40TQFN
XRP7740ILBTR-F
IC REG 5OUT BCK/LINEAR 40TQFN
ZDS1009TA
IC CURRENT MIRROR SOT223-8
ZXCT1008FTA
IC CURRENT MONITOR 1% SOT23-3
ZXCT1009T8TA
IC CURRENT MONITOR 1% SM8
ZXCT1010E5TA
IC CURRENT MONITOR 1% SOT-23-5
ZXCT1011E5TA
IC CURRENT MONITOR 1% SOT23-5
ZXCT1012DAATA
IC CURRENT MONITOR 2.5% 5TDFN
相关代理商/技术参数
XRP7714ILB-0X18-F
功能描述:电压模式 PWM 控制器 4CH DIGITAL PWM CTRL I2C INTERFACE
RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
XRP7714ILB-0X1C-F
功能描述:电压模式 PWM 控制器 4CH DIGITAL PWM CTRL I2C INTERFACE
RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel
XRP7714ILB-F
功能描述:软开关 PWM 控制器 4Ch Digital Pwr Cntr w/LDO prog. thru PC
RoHS:否 制造商:Fairchild Semiconductor 输出端数量: 输出电流: 开关频率: 工作电源电压:30 V 电源电流: 最大工作温度:+ 105 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Reel
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