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| 型号： | MIC2182-5.0YM |
| 厂商： | Micrel Inc |
| 文件页数： | 15/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 48 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 86% |
| 电源电压： | 4.5 V ~ 32 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-2158 MIC2182-5.0YM-ND |
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MIC2182
? Reduced maximum duty cycle due to switching
transition times and constant delay times in the
controller. As the switching frequency increased,
the switching period decreases. The switching
transition times and constant delays in the
MIC2182 start to become noticeable. The effect
is to reduce the maximum duty cycle of the
controller. This will cause the minimum input to
output differential voltage (dropout voltage) to
increase.
Micrel
The soft-start voltage is applied directly to the PWM compara-
tor. A 5uA internal current source is used to charge up the
soft-start capacitor. The capacitor is discharged when either
the enable voltage drops below the UVLO threshold (2.5V) or
the V DD voltage drops below the UVLO level (4.1V).
The part switches at a minimum duty cycle when the soft-start
pin voltage is less than 0.4V. This maintains a charge on the
bootstrap capacitor and insures high-side gate drive voltage.
As the soft-start voltage rises above 0.4V, the duty cycle
increases from the minimum duty cycle to the operating duty
100
80
60
40
SOP
300kHz
cycle. The oscillator runs at the foldback frequency of 60kHz
until the output voltage rises above 0.95V. Above 0.95V, the
switching frequency increases to 300kHz (or the sync ’ d
frequency), causing the output voltage to rise a greater rate.
The rise time of the output is dependent on the soft-start
capacitor, output capacitance, output voltage, and load cur-
20
400kHz
500kHz
rent. The oscilloscope photo in Figure 9 show the output
voltage and the soft-start pin voltage at startup.
0
0
4
8 12 16 20 24 28 32
Minimum Pulse Width
SUPPLY VOLTAGE (V)
Figure 10a. SOP Gate Charge vs. Input Voltage
The MIC2182 has a specified minimum pulse width. This
minimum pulse width places a lower limit on the minimum
duty cycle of the buck converter. When the MIC2182 is
100
80
60
SSOP
operating in forced PWM mode (pin 2 low) and when the
output current is very low or zero, there is a limit on the ratio
of V OUT /V IN . If this limit is exceeded, the output voltage will
rise above the regulated voltage level. A minimum load is
40
300kHz
required to prevent the output from rising up. This will not
occur for output voltages greater than 3V.
20
400kHz
500kHz
Figure 11 should be used as a guide when the MIC2182 is
forced into PWM-only mode. The actual maximum input
0
0
4
8 12 16 20 24 28 32
voltage will depend on the exact external components used
SUPPLY VOLTAGE (V)
Figure 10b. SSOP Gate Charge vs. Input Voltage
It is recommended that the user limits the maximum synchro-
nized frequency to 600kHz. If a higher synchronized fre-
quency is required, it may be possible and will be design
dependent. Please consult Micrel applications for assis-
tance.
Soft Start
(MOSFETs, inductors, etc.).
35
30
25
20
15
Soft start reduces the power supply input surge current at
startup by controlling the output voltage rise time. The input
10
0
1 2 3 4 5
OUTPUT VOLTAGE (V)
6
surge appears while the output capacitance is charged up. A
slower output rise time will draw a lower input surge current.
Soft start may also be used for power supply sequencing.
Figure 11. Max. Input Voltage in Forced-PWM Mode
This restriction does not occur when the MIC2182 is set to
automatic mode (pin 2 connected to a capacitor) since the
converter operates in skip mode at low output current.
April 22, 2004
15
M9999-042204
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相关代理商/技术参数 |
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| MIC2182BM | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2182BM TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2182BSM | 功能描述:DC/DC 开关控制器 High EfficiencySynchronous Buck Controller SSOP Pkg 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 |
| MIC2182BSM TR | 功能描述:DC/DC 开关控制器 High EfficiencySynchronous Buck Controller SSOP Pkg 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 |
| MIC2182BSMTR | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
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