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SP7651ER-L

更新时间： 2024-02-27 21:36:36

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器
页数	文件大小	规格书
15页	1035K
描述
Wide Input Voltage Range 3Amp 900kHz Buck Regulator

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技术参数
数据手册

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SP7651ER-L 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

SP7651ER-L 数据手册

THEORY OF OPERATION

safely begin down conversion, and an inter-

nal V_CCUVLO ensures that the controller

itselfhasenoughvoltagetoproperlyoperate.

Other protection features include thermal

shutdown and short-circuit detection. In the

event that either a thermal, short-circuit, or

UVLOfaultisdetected,theSP765ꢀisforced

intoanidlestatewheretheoutputdriversare

held off for a ﬁnite period before a re-start

is attempted.

Thermal and Short-Circuit

Protection

Because the SP765ꢀ is designed to drive

largeoutputcurrent,thereisachancethatthe

power converter will become too hot. There-

fore, an internal thermal shutdown (145°C)

has been included to prevent the IC from

malfunctioning at extreme temperatures.

A short-circuit detection comparator has

also been included in the SP765ꢀ to protect

against an accidental short at the output

of the power converter. This comparator

constantly monitors the positive and nega-

tive terminals of the error ampliﬁer, and if

the V_FBpin falls more than 250mV (typical)

below the positive reference, a short-circuit

faultisset.BecausetheSSpinoverridesthe

internal 0.8V reference during soft start, the

SP765ꢀ is capable of detecting short-circuit

faults throughout the duration of soft start as

well as in regular operation.

Soft Start

“Soft Start” is achieved when a power con-

verter ramps up the output voltage while

controlling the magnitude of the input sup-

ply source current. In a modern step down

converter, ramping up the positive terminal

of the error ampliﬁer controls soft start. As a

result,excesssourcecurrentcanbedeﬁned

as the current required to charge the output

capacitor.

I_VIN= C_OUT* (∆V_OUT/ ∆T_SOFT-START

)

Handling of Faults:

The SP765ꢀ provides the user with the op-

tion to program the soft start rate by tying

a capacitor from the SS pin to GND. The

selection of this capacitor is based on the

ꢀ0µA pullup current present at the SS pin

and the 0.8V reference voltage. Therefore,

the excess source can be redeﬁned as:

Upon the detection of power (UVLO), ther-

mal, or short-circuit faults, the SP765ꢀ is

forced into an idle state where the SS and

COMP pins are pulled low and the NFETS

are held off. In the event of UVLO fault, the

SP765ꢀ remains in this idle state until the

UVLO fault is removed. Upon the detection

of a thermal or short-circuit fault, an internal

200ms timer is activated. In the event of a

short-circuit fault, a re-start is attempted im-

mediately after the 200ms timeout expires.

Whereas, when a thermal fault is detected

the200msdelaycontinuouslyrecyclesanda

re-startcannotbeattempteduntilthethermal

fault is removed and the timer expires.

I_VIN= C_OUT* (∆V_OUT*ꢀ0µA / (C_SS* 0.8V)

Under Voltage Lock Out (UVLO)

The SP765ꢀ contains two separate UVLO

comparatorstomonitortheinternalbias(V_CC

)

andconversion(V_IN)voltagesindependently.

The V_CCUVLO threshold is internally set

to 4.25V, whereas the V_INUVLO threshold

is programmable through the UVIN pin.

When the UVIN pin is greater than 2.5V,

the SP765ꢀ is permitted to start up pend-

ing the removal of all other faults. Both the

V_CCand V_INUVLO comparators have been

designed with hysteresis to prevent noise

from resetting a fault.

Error Ampliﬁer and Voltage Loop

Since the heart of the SP765ꢀ voltage error

loop is a high performance, wide bandwidth

transconductance amplifier, great care

shouldbetakentoselecttheoptimalcompen-

sation network. Because of the ampliﬁer’s

Rev J: 3/ꢀ4/07

SP765ꢀ Wide Input Voltage Range 3A, 900kHz, Buck Regulator

1 2 3 456 7 8...15

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