参数资料
| 型号： | SP6127EK1-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 6TSOT |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.05MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 29 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： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
____________________________________________________ GENERAL OVERVIEW
The SP6127 is a fixed frequency, Voltage-mode,
non-synchronous PWM controller optimized for
minimum component, small form factor and cost
where:
effectiveness. It has been designed for single-
supply operation ranging from 4.5V to 29V.
SP6127 has Type-II internal compensation for
use with Electrolytic/Tantalum output capacitors.
For ceramic capacitors Type-III compensation
can be implemented by simply adding an R and
C between output and Feedback. A precision
0.6V reference, present on the positive terminal
f ESRZERO =
f DBPOLE =
1
2 . π . R ESR . C OUT
1
2 . π . L ? C OUT
……….. (2)
………… (3)
of the Error Amplifier, permits programming of the
output voltage down to 0.6V via the FB pin. The
output of the Error Amplifier is internally
compared to a feed-forward (V IN /5 peak-to-peak)
ramp and generates the PWM control. Timing is
governed by an internal oscillator that sets the
PWM frequency at 900kHz.
SP6127 contains useful protection features.
Overcurrent protection is based on the high-side
MOSFET’s R DS ( ON ) and is programmable via a
resistor placed at LX node. Under-Voltage Lock-
Out (UVLO) ensures that the controller starts
functioning only when sufficient voltage exists for
powering IC’s internal circuitry.
Creating a Type-III compensation Network
The above condition requires the ESR zero to be
at a lower frequency than the double-pole from
the LC filter. If this condition is not met, Type-III
compensation should be used and can be
accomplished by placing a series RC
combination in parallel with R1 as shown below.
The value of CZ can be calculated as follows and
RZ selected from table 1.
SP6127 Loop Compensation
The SP6127 includes Type-II internal compensation
CZ =
L ? C
1 . 25 × R 1
………….. (4)
components for loop compensation. External
compensation components are not required for
systems with tantalum or aluminum electrolytic
output capacitors with sufficiently high ESR. Use
the condition below as a guideline to determine
f ESRZERO /
whether or not the internal compensation is
sufficient for your design.
Type-II internal compensation is sufficient if the
following condition is met:
f ESRZERO < f DBPOLE ………………. (1)
f DBPOLE
1X
2X
3X
5X
>= 10X
R Z
50K
40K
30K
10K
2K
Table1- Selection of R Z
Jan28-08 RevE
SP6127 TSOT-6 PFET Buck Controller
Page 4
? 2007 Exar Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6128A | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128A_05 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128AB | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Non-Isolated DC-DC SIP Modules:3.0Vdc-5.5Vdc In, 0.9Vdc-3.3Vdc out, 10A |
| SP6128ACY | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6128ACY/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
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