SP7651EB

更新时间： 2024-02-19 16:20:31

品牌	Logo	应用领域
西伯斯 - SIPEX		/
页数	文件大小	规格书
8页	315K
描述
Evaluation Board Manual

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技术参数
数据手册

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SP7651EB 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	HVSON,	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.66	其他特性：	ALSO OPERATES WITH 3V TO 20V SUPPLY
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION	最大输入电压：	5.5 V
最小输入电压：	4.5 V	标称输入电压：	5 V
JESD-30 代码：	R-PDSO-N26	JESD-609代码：	e3
长度：	7 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	26
最高工作温度：	85 °C	最低工作温度：	-40 °C
最大输出电流：	5 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	HVSON	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE	峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified	座面最大高度：	1 mm
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	990 kHz	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	4 mm
Base Number Matches：	1

SP7651EB 数据手册

USING THE EVALUATION BOARD

1) Powering Up the SP7651EB Circuit

Connect the SP7651 Evaluation Board with an external +12V power supply. Connect

with short leads and large diameter wire directly to the “VIN” and “GND” posts. Connect

a Load between the VOUT and GND2 posts, again using short leads with large

diameter wire to minimize inductance and voltage drops.

2) Measuring Output Load Characteristics

OUT ripple can best be seen touching the probe tip to the pad for C3 and the scope

GND collar touching the GND side of C3 using short wrapped wire around the collar –

avoid a GND lead on the scope which will increase noise pickup.

3) Using the Evaluation Board with Different Output Voltages

While the SP7651 Evaluation Board has been tested and delivered with the output set

to 3.30V, by simply changing one resistor, R2, the SP7651 can be set to other output

voltages. The relationship in the following formula is based on a voltage divider from the

output to the feedback pin VFB, which is set to an internal reference voltage of 0.80V.

Standard 1% metal film resistors of surface mount size 0603 are recommended.

OUT = 0.80V (R1 / R2 + 1) => R2 = R1 / [ ( Vout / 0.80V ) – 1 ]

Where R1 = 68.1KΩ and for VOUT = 0.80V setting, simply remove R2 from the board.

Furthermore, one could select the value of the R1 & R2 combination to meet the exact

output voltage setting by restricting R1 resistance range such that 50KΩ ≤ R1 ≤ 100KΩ

for overall system loop stability.

Note that since the SP7651 Evaluation Board design was optimized for 12V down

conversion to 3.30V, changes of output voltage and/or input voltage will alter

performance from the data given in the Power Supply Data section. In addition, the

SP7651ER provides short circuit protection by sensing VOUT at GND.

POWER SUPPLY DATA

The SP7651ER is designed with a very accurate 1.0% reference over line, load and

temperature. Figure 1 data shows a typical SP7655 Evaluation Board Efficiency plot,

with efficiencies to 87% (including generation of 5V Vcc) and output currents to 3A.

SP7651ER Load Regulation is shown in Figure 2 to have only 0.5% change in output

voltage from 0.5A load to 3A load. Figures 3 and 4 illustrate a 1.5A to 3A and 0A to 3A

Load Step. Start-up Responses in Figures 5, 6 and 7 show a controlled start-up with

different output load behavior when power is applied where the input current rises

smoothly as the Softstart ramp increases. In Figure 8 the SP7651ER is configured for

hiccup mode in response to an output dead short circuit condition and will Soft-start until

the over-load is removed. Figure 9 and 10 show output voltage ripple less than 25mV at

no load to 3A load.

While data on individual power supply boards may vary, the capability of the SP7651ER

of achieving high accuracy over a range of load conditions shown here is quite

impressive and desirable for accurate power supply design.

Sept12-06

SP7651 Evaluation Manual

Page 2 of 8

123 4 5 6 7 8

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