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| 型号： | MIC2131-4YTSE |
| 厂商： | Micrel Inc |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16TSSOP |
| 标准包装： | 94 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 80% |
| 电源电压： | 8 V ~ 40 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-3099-5 |
D =
I RIPPLE =
= 2 . 1 A
= 5 +
= 6 . 05 A
2
I SET + 6 . 05 ?
= 6 . 00 A
R CS =
= 333 ?
6 . 00 ? 10 m ?
180 μ A
Micrel, Inc.
L = Power inductor value
T DLY = Current limit blanking time ~ 100ns
I CS(min) = 180μA
Example:
Consider a 12V to 3.3V @ 5A converter with 7.3μH
power inductor and 93% efficiency at a 5A load and an
LSD FET of RDS ON of 10m ? (typical values).
V OUT
V IN ? Efficiency
3 . 3 ? (1 ? 0 . 306 )
150 kHz ? 7 . 3 μ H
2 . 1
I PK
3 .3 ? 100 ns
7 . 3 μ H
(332 std. value)
Using the simple method here would result in a current
limit point lower than desired.
This equation sets the minimum current limit point of the
converter, but maximum will depend upon the actual
inductor value and RDS ON of the MOSFET under current
limit conditions. This could be in the region of 50%
higher and should be considered to ensure that all the
power components are within their thermal limits unless
thermal protection is implemented separately.
HCL (MIC2131 only)
The high current limit (HCL) is a function of the MIC2131
only. It allows for twice the output load current (for a time
T determined by the HCL cap) before the current limit
comparator trips. During the time T, the current sense
current source (200μA nominal) is increased to 400μA.
T = CHCL * 2/13μ = CHCL * 153.85 *1e3
Where CHCL is the cap at the HCL pin
Frequency Dithering
The MIC2131 has an additional useful feature. The
switching frequency is dithered ±12% in order to spread
the frequency spectrum over a wider range to lower the
EMI noise peaks generated by the switching
components. A pseudo random generator is used to
generate the ±dithering which further reduces the EMI
noise peaks.
MIC2130/1
Power Good Output
The power good output (PG) will go high only when
output is above 90% of the nominal set output voltage.
VDD Regulator
The internal regulator provides a regulated 5V for
supplying the analog circuit power (AV DD ). V DD also
powers the MOSFET drivers. V DD is designed to operate
at input voltages down to 8V. The AV DD supply should be
connected to V DD through an RC filter to provide
decoupling of the switching noise generated by the
MOSFET drivers taking large current pulses from the
V DD regulator.
Gate Drivers
The MIC2130/31 is designed to drive both high side and
low side N-Channel MOSFETs to enable high switching
speeds with the lowest possible losses. The high side
MOSFET gate driver is supplied by a bootstrap capacitor
CBST connected at the SW pin and the BST pin. A high
speed diode (a Schottky diode is recommended)
between the V DD pin and BST pin is required as shown
in Figure 8. This provides the high side MOSFET with a
constant VGS drive voltage equal to V DD - V DIODE .
Figure 8.
When HSD goes high, this turns on the high side
MOSFET and the SW node rises sharply. This is
coupled through the bootstrap capacitor CBST and
Diode DBST becomes reverse biased. The MOSFET
Gate is held at V DD -V DIODE above the Source for as long
as CBST remains charged. This bias current of the High
side driver is <10mA so a 0.1μF to1 μF is sufficient to
hold the gate voltage with minimal droop for the power
stroke (High side switching) cycle, i.e. ? BST = 10mA x
6μs / 0.1μF = 567mV. When the low side driver turns on
every switching cycle, any lost charge from CBST is
replaced via DBST as it becomes forward biased.
Therefore minimum BST voltage is V DD – 0.5V.
The Low side driver is supplied directly from V DD at
nominal 5V.
April 2008
12
M9999-042108-C
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| MIC2131-4YTSE TR | 功能描述:DC/DC 开关控制器 High Voltage 150KHz Synchronous Buck Control IC 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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| MIC2141_06 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower Boost Converter |
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