- 您现在的位置：买卖IC网 > PDF目录17380 > SP6126EB (Exar Corporation)EVAL BOARD FOR SP6126 PDF资料下载
参数资料
| 型号： | SP6126EB |
| 厂商： | Exar Corporation |
| 文件页数： | 6/14页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP6126 |
| 标准包装： | 1 |
| 系列： | * |
GENERAL OVERVIEW
Overcurrent Protection
SP6126
Gate
Vin
Q1
Using the above equation there is good
agreement between calculated and test results
when an RS in the range of 0.5k to 3k is used.
For RS larger than 3k test results are lower than
those predicted by (5), due to circuit parasitics.
Using the ON/OFF Function
Feedback pin serves a dual role of ON/OFF
Ov er-Current Comparator
LX
Rs
control. The MOSFET driver is disabled when a
voltage greater than 1V is applied at FB pin.
Maximum voltage rating of this pin is 5.5V. The
controlling signal should be applied through a
Ds
small signal diode as shown on page 1. Please
Vin - 0.3V
30uA
note that an optional 10k bleeding resistor
across the output helps keep the output
capacitor discharged under no load condition.
Programming the Output Voltage
To program the output voltage, calculate R2
using the following equation:
? ?
? 1 ? ?
Figure 3- Overcurrent protection circuit
The overcurrent protection circuit functions by
monitoring the voltage across the high-side FET
R 2 =
R 1
? Vout
? Vref
?
?
Q1. When this voltage exceeds 0.3V, the
overcurrent comparator triggers and the
controller enters hiccup mode. For example if
Q1 has Rds(on)=0.1 , then the overcurrent will
trigger at I = 0.3V/0.1 =3A. To program a lower
overcurrent use a resistor Rs as shown in figure
1. Calculate Rs from:
Where: Vref=0.6 is the reference voltage of the
SP6126
R1=200k is a fixed-value resistor that, in
addition to being a voltage divider, it is part of
the compensation network. In order to simplify
compensation calculations, R1 is fixed at 200k .
Rs =
0 . 3 ? ( 1 .15 × Iout × Rds ( on ) )
30 uA
…..…… (5)
Soft Start
Soft Start is preset internally to 5ms (nominal).
Internal Soft Start eliminates the need for the
The overcurrent circuit triggers at peak current
through Q1 which is usually about 15% higher
than average output current. Hence the
multiplier 1.15 is used in (5).
Example: A switching MOSFET used with
SP6126 has Rds(on) of 0.1 . Program the over-
current circuit so that maximum output is 2A.
external capacitor CSS that is commonly used to
program this function.
MOSFET Gate Drive
P-channel drive is derived through an internal
regulator that generates V IN -5V. This pin (VDR)
has to be connected to V IN with a 0.1uF
decoupling capacitor. The gate drive circuit
Rs =
0 . 3 ? ( 1 .15 × 1 A × 0 . 1 Ohm )
30 uA
swings between V IN and V IN -5 and employs
powerful drivers for efficient switching of the P-
channel MOSFET.
Rs = 2333
Nov07 -08 Rev G
SP6126: TSOT-6 PFET Buck Controller
6
? 200 8 Exar Corporation
相关PDF资料 |
PDF描述 |
|---|---|
| R1S8-1512/P-R | CONV DC/DC 1W 15VIN 12VOUT |
| SP6125EB | EVAL BOARD FOR SP6125 |
| R1S8-1509/P-R | CONV DC/DC 1W 15VIN 09VOUT |
| SP6123EB | EVAL BOARD FOR SP6123 |
| MAX4825ETP+T | IC RELAY DRIVER 8CHAN 20-TQFN |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6126EK1 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP6126EK1L | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L | 功能描述:DC/DC 开关控制器 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 |
| SP6126EK1L/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:High-Voltage, Step Down Controller in TSOT6 |
| SP6126EK1-L/TR | 功能描述:电压模式 PWM 控制器 High-Voltage Step Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。