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PWM Controller for Programmable Power Converter (USBPD)

RT7786

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RT7786 series is specifically designed to work with controllers, such as RT7207, to provide a total solution for USB PD or a programmable power adapter. The RT7786 can achieve high efficiency, meet safety standards, and consume less than 30mW of power in a 5V standby condition.

The RT7786 includes several innovations in order to provide a solution with a wide range of output voltages. By way of DMAG pin, the RT7786 senses output voltages to adjust loop gain for system stability, to adjust output over-voltage protection threshold voltage to protect external devices, and to adjust current limit to meet Limited Power Source (LPS) safety requirements.

The RT7786 is also equipped with comprehensive protection features, including brown-in/brown-out protection, VDD over-voltage protection (VDD OVP), output over-voltage/under-voltage protection (Output OVP/UVP), secondary rectifier short-circuit protection (SRSP), and external over-temperature protection (External OTP). For constant output power regulation, a resistor connected to CS pin can be used to achieve accurate line compensation across the universal input voltage range. The RT7786 also provides various features to protect against any failures occurring at the secondary-side component, such as the RT7207 or a shunt regulator.

The RT7786 and the RT7207 work together to realize a robust and safe design to prevent all the potential fault scenarios, which may arise from versatile and unknown connections to various devices, cables, plugs and receptacles.

Applications

  • USB PD and Programmable Power Adapters
Key Spec.
RT7786AE RT7786GA RT7786GC RT7786GCD RT7786GE RT7786LC RT7786LE RT7786LEP
Status Active Active Active Active Active Active Active Preview
Feedback Regulation Mode SSR SSR SSR SSR SSR SSR SSR SSR
Switching Frequency_Normal (kHz) 85 85 85 85 85 85 85 85
Peak load Application No No No No No No No No
HV Start-up Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge) Yes(w/i X-CAP discharge)
CCM/Valley Multi-mode Yes No Yes Yes Yes Yes Yes Yes
Programmable Burst/Green-mode No No No No No No No No
OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP Adaptive OVP
External OTP Yes Yes Yes Yes Yes Yes Yes Yes
UVLO ON (V) 18 18 18 18 18 18 18 18
UVLO OFF (V) 7 7 7 7 7 7 7 7
VDD OVP (V) 34.5 34.5 34.5 34.5 34.5 34.5 34.5 34.5
Features Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP Adjustable Current Limit;Cycle-by-Cycle Current Limit;OCP;OVP;UVP
Package Type SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8 SOP-8
Features
  • Optimized for Adaptive Output Power
    ► Wide VDD Range : 10V to 32V
    ► Adaptive Output Over-Voltage Protection (Except RT7786XA)
    ► Adaptive Over-Current Protection
    ► Adaptive Loop Gain Control for Loop Stability
  • High Efficiency
    ► Green Mode Operation at Light Load or No Load
  • Comprehensive Protection Features
    ► Brown-In and Brown-Out Protection
    ► VDD Over-Voltage Protection
    ► Output Over-Voltage and Under-Voltage Protection
    ► External Over-Temperature Protection
    ► Secondary Rectifier Short-Circuit Protection
    ► Programmable Line Compensation
  • Others
    ► < 30mW in 5V Standby Mode for Power Saving
    ► Driver Capability : 300mA/−300mA
    ► SmartJitterTM Technology
Datasheet
TitleLast UpdateShareDownload
PWM Controller for Programmable Power Converter (USBPD)2016/12/29
Technical Documents
TitleLast UpdateShareDownload
Introduction to Richtek USB Type-C Power Delivery Solutions2018/12/18
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