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参数资料
| 型号： | MIC2164-3YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 15/39页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-MSOP |
| 产品培训模块： | MIC2124 Synchronous Current Mode DC-DC Buck Controller |
| 标准包装： | 100 |
| 系列： | Hyper Speed Control™ |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 1.25MHz |
| 占空比： | 66% |
| 电源电压： | 3 V ~ 28 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 ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-3544-5 |
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I CL ≈
Micrel, Inc.
Figure 4. MIC2164/-2/-3 Current Limiting Circuit
Using the typical V CL value of 130mV, the current limit
value is roughly estimated as:
130mV
R DS(ON)
For designs where the current ripple is significant
compared to the load current I OUT , or for low duty cycle
operation, calculating the current limit I CL should take
into account that one is sensing the peak inductor
current and that there is a blanking delay of
approximately 150ns.
MIC2164/-2/-3/C
MOSFET Gate Drive
The MIC2164/-2/-3 high-side drive circuit is designed to
switch an N-Channel MOSFET. The block diagram of
Figure 1 shows a bootstrap circuit, consisting of D1 (a
Schottky diode is recommended) and C BST . This circuit
supplies energy to the high-side drive circuit. Capacitor
C BST is charged while the low-side MOSFET is on and
the voltage on the LX pin is approximately 0V. When the
high-side MOSFET driver is turned on, energy from C BST
is used to turn the MOSFET on. As the high-side
MOSFET turns on, the voltage on the LX pin increases
to approximately V HSD . Diode D1 is reversed biased and
C BST floats high while continuing to keep the high-side
MOSFET on. The bias current of the high-side driver is
less than 10mA so a 0.1 μ F to 1 μ F is sufficient to hold
the gate voltage with minimal droop for the power stroke
(high-side switching) cycle, i.e. Δ BST = 10mA x
3.33 μ s/0.1 μ F = 333mV for MIC2164. When the low-side
MOSFET is turned back on, C BST is recharged through
D1. A small resistor R G , which is in series with C BST , can
slow down the turn-on time of the high-side N-channel
MOSFET.
The drive voltage is derived from the supply voltage V IN .
The nominal low-side gate drive voltage is V IN and the
nominal high-side gate drive voltage is approximately V IN
– V DIODE , where V DIODE is the voltage drop across D1. An
approximate 30ns delay between the high-side and low-
I CL =
130mV
R DS(ON)
+
V OUT * T DLY
L
?
Δ I L(pp)
2
(2)
side driver transitions is used to prevent current from
simultaneously flowing unimpeded through both
MOSFETs.
Δ I L(pp) =
V OUT ? (1 ? D)
f SW ? L
(3)
where
V OUT = The output voltage
T DLY = Current limit blanking time, 150ns typical
Δ I L(pp) = Inductor current ripple peak-to-peak value
D = Duty Cycle
f SW = Switching frequency
The MOSFET R DS(ON)
varies 30 to 40% with
temperature; therefore, it is recommended to add a 50%
margin to I CL in the above equation to avoid false current
limiting due to increased MOSFET junction temperature
rise. It is also recommended to connect LX pin directly to
the drain of the low-side MOSFET to accurately sense
the MOSFETs R DS(ON) .
September 2010
15
M9999-091310-D
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相关代理商/技术参数 |
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| MIC2164-3YMM TR | 功能描述:DC/DC 开关控制器 1MHz PWM Buck Controller 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 |
| MIC2164CYMM | 功能描述:DC/DC 开关控制器 Constant Freq Sync DC-DC Buck Controller 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 |
| MIC2164CYMM TR | 功能描述:DC/DC 开关控制器 Constant Freq Sync DC-DC Buck Controller 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 |
| MIC2164YMM | 功能描述:DC/DC 开关控制器 300kHz PWM Buck Controller 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 |
| MIC2164YMM TR | 功能描述:DC/DC 开关控制器 300kHz PWM Buck Controller 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 |
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