参数资料
型号: L5988D
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 5.6 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装: LEAD FREE, HTSSOP-16
文件页数: 8/52页
文件大小: 1858K
代理商: L5988D
Functional description
L5988D
16/52
Doc ID 15324 Rev 3
To improve the line transient performance, the voltage feed forward is implemented by
changing the slope of the sawtooth according to the input voltage change (see Figure 6 a).
Figure 6.
Sawtooth: voltage feed forward
The slope of the sawtooth does not change if the oscillator frequency is increased by an
external signal or adjusted by the external resistor (see Figure 7). As a consequence the
gain of the PWM stage is a function of the switching frequency and its contribution must be
taken in account when performing the calculations of the compensation network (see
Chapter 6.4.1 and Chapter 6.4.2).
Figure 7.
Sawtooth: synchronization and frequency adjust
Table 7.
FSW resistor examples
R1 (k
Ω)f
SW (kHz)
R2 (k
Ω)f
SW (kHz)
43
198
360
450
47
215
180
499
56
245
120
548
62
261
91
594
82
295
56
711
110
322
43
801
150
343
33
915
220
361
27
1022
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相关代理商/技术参数
参数描述
L5988DTR 功能描述:直流/直流开关调节器 4A Step Down Reg 2.9V to 18V 200ns 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
L5989D 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw 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
L5989DTR 功能描述:直流/直流开关调节器 4A cont 5A pulsed step-down sw 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
L5991 功能描述:电流型 PWM 控制器 Prog Current Mode RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
L5991_01 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:PRIMARY CONTROLLER WITH STANDBY