A7986ATR

更新时间： 2024-01-08 01:14:19

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管输出元件 PC
页数	文件大小	规格书
42页	1578K
描述
3 A step-down switching regulator for automotive applications

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A7986ATR 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	HSOP-8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
Factory Lead Time：	11 weeks	风险等级：	1.71
Samacsys Confidence：	4	Samacsys Status：	Released
Samacsys PartID：	293663	Samacsys Pin Count：	9
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Small Outline Packages
Samacsys Footprint Name：	HSOP8	Samacsys Released Date：	2016-03-17 17:20:29
Is Samacsys：	N	其他特性：	ADJUSTABLE OUTPUT VOLTAGE RANGE FROM 0.6 VOLT TO 38 VOLT
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：	38 V
最小输入电压：	4.5 V	标称输入电压：	12 V
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e3
长度：	4.9 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-40 °C
最大输出电流：	5.2 A	封装主体材料：	PLASTIC/EPOXY
封装代码：	HLSOP	封装等效代码：	SOP8,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, LOW PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	认证状态：	Not Qualified
座面最大高度：	1.7 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	1000 kHz	温度等级：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	3.9 mm
Base Number Matches：	1

A7986ATR 数据手册

A7986A

Functional description

5.1

Oscillator and synchronization

Figure 4 shows the block diagram of the oscillator circuit. The internal oscillator provides a

constant frequency clock. Its frequency depends on the resistor externally connected to the

FSW pin. If the FSW pin is left floating, the frequency is 250 kHz; it can be increased as

shown in Figure 6 by an external resistor connected to ground.

To improve the line transient performance, keeping the PWM gain constant versus the input

voltage, the voltage feed-forward is implemented by changing the slope of the sawtooth

according to the input voltage change (see Figure 5.a).

The slope of the sawtooth also changes if the oscillator frequency is increased by the

external resistor. In this way a frequency feed-forward is implemented (Figure 5.b) in order

to keep the PWM gain constant versus the switching frequency (see Section 6.4 for PWM

gain expression).

The synchronization signal is generated on the SYNCH pin. This signal has a phase shift of

180 ° with respect to the clock. This delay is useful when two devices are synchronized

connecting the SYNCH pins together. When the SYNCH pins are connected, the device

with higher oscillator frequency works as master, so the slave device switches at the

frequency of the master but with a delay of half a period. This minimizes the RMS current

flowing through the input capacitor (see the L5988D datasheet).

Figure 4. Oscillator circuit block diagram

Clock

FSW

Clock

SYNCH

Synchronization

Generator

Ramp

Sawtooth

Generator

The device can be synchronized to work at higher frequency feeding an external clock

signal. The synchronization changes the sawtooth amplitude, changing the PWM gain

(Figure 5.c). This change must be taken into account when the loop stability is studied. To

minimize the change of the PWM gain, the free-running frequency should be set (with a

resistor on the FSW pin) only slightly lower than the external clock frequency. This pre-

adjusting of the frequency changes the sawtooth slope in order to render the truncation of

sawtooth negligible, due to the external synchronization.

DocID022801 Rev 5

9/42

1...6 7 8910 11 12...42

中文翻译

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A7986ATR 替代型号

型号	品牌	替代类型	描述	数据表
A7986A	STMICROELECTRONICS	类似代替	3 A step-down switching regulator for automotive applications
L7986TA	STMICROELECTRONICS	类似代替	3 A step-down switching regulator

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A79L05K3R	AITSEMI	获取价格	THREE TERMINAL NEGATIVE VOLTAGE REGULATOR
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A79L05ZA	AITSEMI	获取价格	THREE TERMINAL NEGATIVE VOLTAGE REGULATOR
A79L05ZB	AITSEMI	获取价格	THREE TERMINAL NEGATIVE VOLTAGE REGULATOR
A79L05ZVA	AITSEMI	获取价格	THREE TERMINAL NEGATIVE VOLTAGE REGULATOR

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