参数资料
型号: PM6670STR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封装: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件页数: 42/54页
文件大小: 742K
代理商: PM6670STR
PM6670S
Application information
Doc ID 14432 Rev 4
47/54
8.1.6
VDDQ current limit setting
The valley current limit is set by RCSNS and must be chosen to support the maximum load
current. The valley of the inductor current ILvalley is:
Equation 45
The output current limit depends on the current ripple as shown in Figure 41:
Figure 41.
Valley current limit waveforms
As the valley threshold is fixed, the greater the current ripple, the greater the DC output
current will be. If an output current limit greater than ILOAD(max) over all the input voltage
range is required, the minimum current ripple must be considered in the previous formula.
Then the resistor RCSNS is:
Equation 46
where RDSon is the drain-source on-resistance of the low-side switch. Consider the
temperature effect and the worst case value in RDSon calculation (typically +0.4 %/°C).
The accuracy of the valley current also depends on the offset of the internal comparator
(±6 mV).
The negative valley-current limit (if the device works in forced-PWM mode) is given by:
Equation 47
2
I
(max)
I
L
LOAD
Lvalley
Δ
=
Inductor current
Valley current limit
MAX LOAD 1
MAX LOAD 2
Current
Time
Inductor current
uA
100
I
R
Lvalley
DSon
CSNS
=
DSon
NEG
R
mV
110
I
=
相关PDF资料
PDF描述
PM6670S 3 A SWITCHING CONTROLLER, QCC24
PM6670TR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670 1.4 A SWITCHING CONTROLLER, QCC24
PM6675ASTR 3 A SWITCHING CONTROLLER, QCC24
相关代理商/技术参数
参数描述
PM6670TR 功能描述:直流/直流开关调节器 Complete DDR2/3 Mem Pwr supply controllr 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
PM6675 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:LDO CNTRLR STDN 0.6V TO 3.3V/1.5V 24PIN VFQFPN - Rail/Tube
PM6675AS 功能描述:DC/DC 开关控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK
PM6675ASTR 功能描述:低压差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6
PM6675ATR 功能描述:低压差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6