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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： | 10/52页 |
| 文件大小： | 1858K |
| 代理商： | L5988D |
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Functional description
L5988D
18/52
Doc ID 15324 Rev 3
5.3
External voltage reference
An external 1.8 V regulated voltage is provided. This reference is useful to set the voltage at
the multifunction pin (see 5.1) or to source current to ILIM-ADJ and FSW pins (see and
5.5.2). The typical current capability is 4 mA.
5.4
Soft-start
When VCC is above the selected UVLO threshold the start-up phase takes place. At start-
up, a voltage ramp is generated charging the external capacitor CSS with an internal current
generator. The device is in inhibit mode as long as SS/INH pin is below the INH threshold.
The L5988D implements the soft-start phase by clamping the output of the error amplifier
and, being based on a voltage mode control, the duty cycle. In fact the comparison between
the output of the error amplifier and the internal saw tooth waveform generates the duty
cycle needed to keep the output voltage in regulation.
Two different current sources charge the external capacitor depending on the pin voltage in
order to reduce the power consumption in INH mode.
The equation for the soft-start time is:
Considering ISS2/ISS1 = 22/5 = 4.4, the proper soft-start capacitor is simply calculated as
follows:
During the soft-start phase (VSS < 2.9 V):
●
the sink capability is always disabled (independently from the multifunction pin settings)
to be compatible with pre-biased output voltage
●
in case the overcurrent limit is detected, a constant current protection is provided in
order to deliver extra current for charging the output capacitor (see 5.5.2 for description
of current protection management).
I
SS
I
SS1
5
=
μA
0
V
SS/INH
1
<<
I
SS2
2
=
2
μA
1
V
SS/INH
2.9
<<
=
T
SS
T
1
Δ
T
2
Δ
+
C
SS
I
SS1
-----------
10
–
()
×
C
SS
I
SS2
-----------
2.9
1
–
()
×
+
==
CnF
()
Tss mS
() 3.5
×
=
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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 |
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