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RT6191A

更新时间： 2024-04-09 18:58:45
品牌 Logo 应用领域
立锜 - RICHTEK 光电二极管
页数 文件大小 规格书
75页 2941K
描述
36V Buck Controller with I2C Interface for USB-PD

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RT6191A 数据手册

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RT6191A  
V
= 12V  
IN  
V
= 12V  
IN  
VIN  
EN  
VIN  
EN  
V
UVLO  
V
= 3.3V  
EN  
V
ENH  
V
EN  
= 3.3V  
V
/ V  
= 5V  
VDDP  
VDD  
V
UVLO  
VDD /  
VDDP  
VDD /  
VDDP  
V
VDD  
/ V  
= 5V  
VDDP  
Software  
EN  
SS  
1.6V  
2.3V  
SS  
Discharge resistor  
default on  
VOUT  
0.7V  
VOUT  
PGOOD  
PGOOD  
16μs  
Figure 3. Power-off Sequence by External EN Pin  
EN Delay  
Time 50μs  
PG Delay  
Time 512μs  
T
SS  
Dynamic Voltage Scaling (DVS)  
Figure 1. Start-up Sequence by Software  
The RT6191A provides DVS function with wide voltage  
range for setting output voltage dynamically. Based on  
the voltage ratio setting of register 0x11[5], the output  
voltage can be set with different resolution by using  
register 0x01 and 0x02. The RT6191A also supports  
DVS rising and falling slew rate selection by using  
register 0x0D[6:3], the default factory setting of  
0x0D[6:3] is “1111” for DVS rising and falling slew rate  
= VOUT / 32s.  
V
= 12V  
IN  
VIN  
V
EN  
= 3.3V  
EN  
V
VDD  
/ V  
= 5V  
VDDP  
VDD /  
VDDP  
Software  
EN  
The ALERT_PG bit, 0x1F[6], will change to “1” when the  
output voltage reaches to the target voltage, and then  
the external ALERT pin will go low immediately. The  
RT6191A also supports Mask function by register  
0x21[6] to make the external ALERT pin not go low after  
DVS operation end. In addition, register 0x37[2] and  
0x38[2] shows 275ms timeout indication if output  
voltage do not reach to target level within 275ms, and  
this mechanism also has Mask function by register  
0x39[2].  
SS  
VOUT  
Discharge resistor off  
Discharge resistor on  
PGOOD  
16μs  
Figure 2. Power-off Sequence by Software  
TM  
AnyVolt Constant Voltage (CV) Regulation  
The RT6191A utilizes peak current mode control  
topology as main control loop for output constant  
voltage (CV) regulation. The output voltage is used to  
compare with the internal reference voltage to obtain an  
error signal by sensing VOUT pin voltage. This error  
Copyright © 2022 Richtek Technology Corporation. All rights reserved.  
is a registered trademark of Richtek Technology Corporation.  
DS6191A-00  
December 2022  
www.richtek.com  
7
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