Datasheet > RT6200

RT6200

更新时间： 2024-04-09 19:02:36

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
12页	255K
描述
0.6A, 36V, 1.2MHz Step-Down Converter

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RT6200 数据手册

RT6200

Application Information

The RT6200 is a high voltage buck converter that can

support the input voltage range from 4.5V to 36V and the

output current can be up to 0.6A.

Inductor Selection

The inductor value and operating frequency determine the

ripple current according to a specific input and output

voltage. The ripple current ΔI_Lincreases with higher V_IN

and decreases with higher inductance.

Output Voltage Setting

The resistive voltage divider allows the FB pin to sense a

fraction of the output voltage as shown in Figure 1.

f L

V_OUT



_OUT 

 1

 



I_L=









 

Having a lower ripple current reduces not only the ESR

losses in the output capacitors but also the output voltage

ripple. High frequency with small ripple current can achieve

highest efficiency operation. However, it requires a large

inductor to achieve this goal.

OUT

RT6200

GND

For the ripple current selection, the value of ΔI_L= 0.4(I_MAX

)

will be a reasonable starting point. The largest ripple

current occurs at the highest V_IN. To guarantee that the

ripple current stays below the specified maximum, the

inductor value should be chosen according to the following

equation :

Figure 1. Output Voltage Setting

For adjustable voltage mode, the output voltage is set by

an external resistive voltage divider according to the

following equation :



 



f  I

OUT

IN(MAX)

OUT











L =

 1

V_OUT= V_FB1





 



L(MAX)



 



Where V_FBis the feedback reference voltage (0.8V typ.).

Inductor Core Selection

The inductor type must be selected once the value for L

is known. Generally speaking, high efficiency converters

can not afford the core loss found in low cost powdered

iron cores. So, the more expensive ferrite or

mollypermalloy cores will be a better choice.

External Bootstrap Diode

Connect a 10nF low ESR ceramic capacitor between the

BOOT pin and PHASE pin. This capacitor provides the

gate driver voltage for the high side MOSFET.

It is recommended to add an external bootstrap diode

between an external 5V and the BOOT pin for efficiency

improvement when input voltage is lower than 5.5V or duty

ratio is higher than 65%. The bootstrap diode can be a

low cost one such as 1N4148 or BAT54.

The selected inductance rather than the core size for a

fixed inductor value is the key for actual core loss. As the

inductance increases, core losses decrease. Unfortunately,

increase of the inductance requires more turns of wire

and therefore the copper losses will increase.

The external 5V can be a 5V fixed input from system or a

Ferrite designs are preferred at high switching frequency

due to the characteristics of very low core losses. So,

design goals can focus on the reduction of copper loss

and the saturation prevention.

5V output of the RT6200.

BOOT

Ferrite core material saturates “hard”, which means that

inductance collapses abruptly when the peak design

current is exceeded. The previous situation results in an

abrupt increase in inductor ripple current and consequent

output voltage ripple.

10nF

RT6200

PHASE

Figure 2. External Bootstrap Diode

Do not allow the core to saturate!

is a registered trademark of Richtek Technology Corporation.

DS6200-04 August 2015

www.richtek.com

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与RT6200相关器件

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RT62019PN	AMPHENOL	获取价格	RT360â¢ industrial circular connectors are m
RT62019PW	AMPHENOL	获取价格	RT360â¢ industrial circular connectors are m
RT62019PX	AMPHENOL	获取价格	RT360â¢ industrial circular connectors are m
RT62019SN	AMPHENOL	获取价格	RT360â¢ industrial circular connectors are m
RT62019SW	AMPHENOL	获取价格	RT360â¢ industrial circular connectors are m
RT6201A	RICHTEK	获取价格	4A, 18V, 650kHz, ACOT? Synchronous Step-Down Converter
RT6201B	RICHTEK	获取价格	4A, 18V, 650kHz, ACOT? Synchronous Step-Down Converter
RT6202A	RICHTEK	获取价格	5A, 18V, 650kHz, ACOT? Synchronous Step-Down Converter
RT6202B	RICHTEK	获取价格	5A, 18V, 650kHz, ACOT? Synchronous Step-Down Converter
RT6203B	RICHTEK	获取价格	5A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter with VID Control

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