Datasheet > RT9611AGQW

RT9611AGQW

更新时间： 2022-06-24 15:44:45

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
15页	228K
描述
Synchronous Rectified Buck MOSFET Drivers

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RT9611AGQW 数据手册

RT9611A/B

maximum power dissipation at T_A= 25°C can be calculated

Layout Consideration

by the following formulas :

Figure 6 shows the schematic circuit of a synchronous

buck converter to implement the RT9611A/B. The

converter operates from 5V to 12V of input Voltage.

P_D(MAX)= (125°C − 25°C) / (120°C/W) = 0.833W for

SOP-8 package

12V

P_D(MAX)= (125°C − 25°C) / (75°C/W) = 1.333W for

SOP-8 (Exposed Pad) package

12V

BOOT

VCC

P_D(MAX)= (125°C − 25°C) / (70°C/W) = 1.429W for

WDFN-8EL 3x3 package

RT9611A/B

UGATE

PWM

The maximum power dissipation depends on the operating

ambient temperature for fixed T_J(MAX)and thermal

resistance, θ_JA. The derating curves in Figure 5 allow the

designer to see the effect of rising ambient temperature

on the maximum power dissipation.

CORE

PHASE

LGATE

PHB83N03LT

PHB95N03LT

GND

Figure 6. Synchronous Buck Converter Circuit

1.5

1.4

Four-Layer PCB

1.3

1.2

When layout the PCB, it should be very careful. The power

circuit section is the most critical one. If not configured

properly, it will generate a large amount of EMI. The

junction of Q1, Q2, L2 should be very close.

SOP-8 (Exposed Pad)

1.1

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

SOP-8

WDFN-8EL 3x3

Next, the trace from UGATE, and LGATE should also be

short to decrease the noise of the driver output signals.

PHASE signals from the junction of the power MOSFET,

carrying the large gate drive current pulses, should be as

heavy as the gate drive trace. The bypass capacitor C4

should be connected to GND directly. Furthermore, the

bootstrap capacitors (C_B) should always be placed as close

to the pins of the IC as possible.

100

125

Ambient Temperature (°C)

Figure 5.Derating Curve of Maximum PowerDissipation

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS9611A/B-03 June 2012

1...9 10 111213 14 15

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与RT9611AGQW相关器件

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RT9611C	RICHTEK	Synchronous Rectified Buck MOSFET Drivers	获取价格
RT9611D	RICHTEK	Synchronous Rectified Buck MOSFET Drivers	获取价格
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RT9612B	RICHTEK	Synchronous-Rectified Buck MOSFET Driver	获取价格
RT9614A	RICHTEK	暂无描述	获取价格