iW1791
AC/DC Primary-Side Rapid ChargeTM PWM Controller
with High Resolution Voltage/Current Control
1 Description
The iW1791 is a high performance AC/DC power supply controller for rapid charge applications that supports high
resolution voltage/current control. It uses Renesas' PrimAccurateTM technology to minimize external component count
and simplify system design. The device operates in quasi-resonant mode to provide high efficiency and it also
provides a number of key built-in protection features. The iW1791 can achieve tight multi-level constant voltage and
multi-level constant current regulation without a traditional secondary feedback circuit. It also eliminates the need for
loop compensation components while maintaining stability over all operating conditions.
The iW1791 is optimized to work with Renesas' secondary-side controllers that use the proprietary digital link (DLNK)
technology. The iW1791 and DLNK-based secondary-side controller chipset together can implement various rapid
charge protocols, such as USB Power Delivery (USB PD), Qualcomm® Quick Charge™ 2.0 and 3.0 (QC2.0 and
QC3.0) technologies, etc. to achieve fast and smooth voltage transitions upon request by mobile devices (MD). The
iW1791 and compatible secondary-side controller from Renesas use the DLNK communction protocol for output
voltage requests, output current limits, output voltage undershoot and over voltage information from the secondary to
the primary.
In addition, the iW1791 uses source charging technology to charge up VCC before startup, which eliminates the external
active start-up (ASU) circuit and still can achieve < 20mW no-load power consumption at typical 5V output setting.
Renesas' innovative proprietary technology ensures that power supplies designed with the iW1791 and Renesas'
secondary-side controllers can provide output voltage configurations of 3V to 20V for USB PD, 5V/9V/12V for QC2.0
and 3.6V to 12V in 200mV increments for QC3.0 and other proprietary protocols.
2 Features
● Supports 10mV DLNK voltage step request required
by USB PD programmable power supply (PPS) and
other proprietary rapid charge protocols
● No audible noise over entire operating range
● User-configurable 4-level cable drop compensation
independent of output voltage
● Source charging VCC technology eliminates the active
start-up (ASU) and maintain ultra-low no-load power
consumption (< 20mW) at 230VAC with typical 5V
output setting
● Proprietary secondary-to-primary digital
communication with single optocoupler for all the
rapid charge information:
x
x
x
Output voltage request
Output current limit
● High VCC pin voltage rating eliminates external VCC
LDO
● Tight multi-level constant-voltage and multi-level
constant-current regulation with primary-side feedback
and control
Output voltage undershoot detection for fast
dynamic load response
x
Over-voltage protection
● Proprietary optimized load adaptive maximum constant
frequency PWM switching with quasi-resonant
operation achieves best size, efficiency, and common
mode noise
●
EZ-EMITM design enhances manufacturability
● Built-in single-point fault protections against output
short-circuit including soft short and half short, output
over-voltage, and output over-current
● Backward compatible with QC2.0/3.0 and other
proprietary rapid charge protocols with secondary-side
interface circuits
●
SmartDefender+TM control technology addresses
issues of soft shorts in cables and connectors by
effectively reducing the average output power at fault
conditions without latch
● Multi-mode PWM/PFM control improves efficiency at
various load conditions
3 Applications
● Rapid-charging AC/DC adapters for smart phones,
tablets and other portable devices.
Qualcomm® Quick ChargeTM 2.0 and 3.0 are products of Qualcomm Technologies, Inc.
Product Summary
Rev. 1.7
26-Jan-2022
1 of 7
www.renesas.com
© 2022 Renesas Electronics
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