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参数资料
| 型号： | SP7661EB |
| 厂商： | Exar Corporation |
| 文件页数： | 8/20页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR SP7661 |
| 标准包装： | 1 |
| 系列： | * |
THEORY OF OPERATION
R9 = [60mV ? (R3 + R4)]
Solving for R9 we get:
[( I MAX ? DCR) – 60mV]
As an example: if desired I MAX is 17A, then
R9 = 63.4K Ω .
SP7661
R8 =
R4 ? [ V OUT - 60mV + ( I MAX ? DCR) ]
60mV - ( I MAX ? DCR)
As an example: for I MAX of 4A and V OUT of 3.3V,
calculated R8 is 381k?.
SP7661
SWN
L = 2.7uH, DCR = 4.1m?
R3
R4
5.11K?
5.11K?
V OUT
SWN
L = 2.7uH, DCR = 4.1m?
R3
R4
5.11K?
5.11K?
V OUT
ISP
R9
63.4K?
ISP
ISN
CSP
6.8nF
ISN
CSP
6.8nF
CS
0.1uF
R8
1.5M?
CS
0.1uF
Over-current detection circuit for
Imax > 60mV / DCR
Decreasing the Current Limit
If it is required to set I MAX < {60mV / DCR , a
resistor is added as shown in the following
figure. R8 increases the net voltage detected
by the current-sense comparator. Voltage at
the positive and negative terminal of com -
parator is given by:
VSP = V OUT + ( I MAX ? DCR)
VSN = V OUT ? { R8 / (R4 +R8) }
Since the comparator is triggered at 60mV:
VSP-VSN = 60 mV
Combining the above equations and solv -
ing for R8:
Over-current detection circuit for
I MAX < {60mV / DCR}
Handling of Faults
Upon the detection of power (UVLO), ther -
mal, or short-circuit faults, the SP7661 is
forced into an idle state where the SS and
COMP pins are pulled low and both switches
are held off. In the event of UVLO fault, the
SP7661 remains in this idle state until the
UVLO fault is removed. Upon the detection
of a thermal or short-circuit fault, an internal
100ms timer is activated. In the event of a
short-circuit fault, a restart is attempted im -
mediately after the 100ms timeout expires.
Whereas, when a thermal fault is detected
the 100ms delay continuously recycles and a
restart cannot be attempted until the thermal
fault is removed and the timer expires.
Mar -07 Rev N
SP766 Wide Input Voltage Range 3A, 600kHz Buck Regulator
8
? 2007 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP7661ER | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Evaluation Board Manual |
| SP7661ER/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 3A, 600kHz, Buck Regulator |
| SP7661ER-L | 功能描述:开关变换器、稳压器与控制器 Buck Regulator RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP7661ERL/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input Voltage Range 3A, 600kHz, Buck Regulator |
| SP7661ER-L/TR | 功能描述:开关变换器、稳压器与控制器 WIDE INPUT VOLTAGE Range A600KHz RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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