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参数资料
| 型号： | XRP6124ES0.5-F |
| 厂商： | Exar Corporation |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM SOT23-5 |
| 标准包装： | 250 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 833kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 18 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： | SC-74A，SOT-753 |
| 包装： | 散装 |
| 其它名称： | 1016-1429 |
X R P 6 1 2 4
N o n - S y n c h r o n o u s P F E T S t e p - D o w n C o n t r o l l e r
THEORY OF OPERATION
THEORY OF OPERATION
fs =
V OUT
V IN × T ON
The XRP6124 utilizes a proprietary Constant
On-Time (COT) control with emulated ESR.
The on-time is internally set and automatically
adjusts during operation, inversely with the
Since for each voltage option, the product of
V IN and T ON is the constant K shown in table 1,
then switching frequency is determined by
V OUT as shown in table 2.
voltage V IN , in order to maintain a constant
frequency. Therefore the switching frequency
is independent of the inductor and capacitor
size, unlike hysteretic controllers. The
emulated ESR ramp allows the use of ceramic
capacitors for output filtering.
V OUT
1.2
1.5
Switching frequency fs(kHz)
XRP6124ES0.5-F XRP6124HVES0.5-F
200 100
250 125
At the beginning of each cycle, the XRP6124
turns on the P-Channel FET for a fixed
duration. The on-time is internally set and
adjusted by V IN . At the end of the on-time the
FET is turned off, for a predetermined
1.8
2.5
3.3
5.0
12
300
417
550
833
---
150
208
275
417
1000
minimum off time T OFF-MIN (nominally 250ns).
After the T OFF-MIN has expired the voltage at
feedback pin FB is compared to a voltage
ramp at the feedback comparators positive
input. Once V FB drops below the ramp voltage,
the FET is turned on and a new cycle starts.
This voltage ramp constitutes an emulated
ESR and makes possible the use of ceramic
capacitors, in addition to other capacitors, as
output filter for the buck converter.
V OLTAGE O PTIONS
The XRP6124 is available in two voltage
Table 2: Switching frequency fs
for the XRP6124 voltage options
Where it is advantageous, the high-voltage
option may be used for low-voltage
applications. For example a 12V IN to 5V OUT
conversion using a low-voltage option will
result in switching frequency of 833kHz as
shown in table 2. If it is desired to increase
the converter efficiency, then switching losses
can be reduced in half by using a high-voltage
option operating at a switching frequency of
417kHz.
options as shown in table 1. The low-voltage
and high-voltage options have T ON of 0.5μs at
12V IN and 24V IN respectively. Note that T ON is
inversely proportional to V IN . The constant of
proportionality K, for each voltage option is
shown in table 1. Variation of T ON versus V IN is
shown graphically in figures 6 and 7.
V OUT
1.2
1.5
1.8
Maximum Output Current I OUT (A)
XRP6124ES0.5-F XRP6124HVES0.5-F
3.3V IN 5.0V IN 12V IN 18V IN 24V IN
5 5 4 --- ---
5 5 4 4 ---
5 5 4 4 4
2.5
3.3
4
---
4
4
4
3
4
4
4
4
Voltage
rating (V)
Part Number
T ON (μs)
K=T ON xV IN
( μ s.V)
5.0
12
---
---
---
---
3
---
3
2
3
2
3-18
XRP6124ES0.5-F
0.5 @ 12V IN
6
Table 3: Maximum recommended I OUT
4.5-30
XRP6124HVES0.5-F 0.5 @ 24V IN
Table 1 : XRP6124 voltage options
12
SHORT - CIRCUIT PROTECTION
The purpose of this feature is to prevent an
For a buck converter the switching frequency
fs can be expressed in terms of V IN , V OUT and
T ON as follows:
accidental short-circuit at the output from
damaging the converter. The XRP6124 has a
short-circuit comparator that constantly
monitors the feedback node, after soft-start is
? 2011 Exar Corporation
7/12
Rev. 1.1.0
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相关代理商/技术参数 |
参数描述 |
|---|---|
| XRP6124ESTR0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl 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 |
| XRP6124EVB | 制造商:Exar Corporation 功能描述:XRP6124EVB 制造商:Exar Corporation 功能描述:EVAL BOARD, XRP6124, PFET STEP DOWN CTRLR, 18V; Silicon Manufacturer:Exar; Kit Application Type:Power Management; Application Sub Type:Buck Controller |
| XRP6124HVES0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl 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 |
| XRP6124HVESTR0.5-F | 功能描述:DC/DC 开关控制器 PFET controllers w/ Cnstnt OnTime Cntrl 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 |
| XRP6124HVEVB | 制造商:Exar Corporation 功能描述:XRP6124HVEVB 制造商:Exar Corporation 功能描述:EVAL BOARD, XRP6124, PFET STEP DOWN CTRLR, 30V; Silicon Manufacturer:Exar; Kit Application Type:Power Management; Application Sub Type:Buck Controller |
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