Datasheet > RT7205AGQWXAA

RT7205AGQWXAA

更新时间： 2022-02-26 12:12:06

品牌	Logo	应用领域
立锜 - RICHTEK		/
页数	文件大小	规格书
36页	642K
描述
Programmable SMPS and USB Type-C Controller

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RT7205AGQWXAA 数据手册

RT7205A

be advertised to an Upstream Facing Port (UFP) as default

USB current, 1.5A, and 3.0A, respectively.

The OVP pin is pulled low when output over-voltage

condition (register-programmable : 115%, 120%, 125%)

occurs. By way of an optocoupler, it can shut down the

primary-side controller (for example, RT7752).

CC1I

DIEN

BLD/OVP

10-bit

MCU

DOL

CC1/CC2

ADC

Figure 5. Interface of BLD and OVP Pins

Figure 4. Interface of CC1 and CC2

SR Control

To improve theAC-DC converter's efficiency, the RT7205A

includes a SR controller, which has proprietary auto-

tracking function to minimize dead time between the

conduction intervals of the SR MOSFET and the main

switch MOSFET, while it can still ensure safe operation

in bothDCM and CCM conditions and even in a wide output

range. To prevent the on-time overlap of the main switch

MOSFET and the SR MOSFET, the SR controller will be

temporarily turned off under conditions of load transition,

output voltage transition, output short circuit, or low output

or input voltages with programmable thresholds. At light

load or no load condition, the SR controller will also be

disabled to reduce power consumption.

Open-Drain Drivers for BLD and OVP Pins

The BLD and OVP pins with their specific functions are

driven by open-drain drivers, as shown in Figure 5 and

explained below.

The BLD pin is used as a bleeder to help discharge the

output capacitor to V_safe5Vupon the detachment of a

connected device, or to a lower desired output voltage

level upon a UFP request, such as from 12V to 5V. A

resistor is connected between V_OUTand the BLD pin and

a power resistor can be used for better power dissipation

capability.

is a registered trademark of Richtek Technology Corporation.

DS7205A-00 February 2018

www.richtek.com

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