SSR Controller - Suzhou Jiyuan Electronic Technology Co., Ltd.

Flyback Topology Converter Controller

Jiyuan can provide flyback converters integrated with BJT for power applications below 24W and integrated with MOSFET for power applications 30W and below, which greatly simplifies the circuit design.
At the same time, Jiyuan can also offer flyback controllers for power applications ranging from 30W to 150W.

Our flyback converter products are divided into two series: the primary-side controlled flyback series and the secondary-side controlled flyback series.
Primary-side controlled flyback series products eliminate the need for optocouplers and secondary-side feedback devices, which can greatly reduce the number of components used and the size of the overall solution.
Secondary-side controlled flyback series products can provide higher precision and faster transient response.

How to Choose Between Primary-side and Secondary-side Controller Series

The primary-side controlled flyback series adopts transformer winding for voltage sampling, eliminating the need for optocouplers and secondary-side voltage sampling circuits. This can greatly reduce the number of components used, minimize the solution size, and optimize the cost to the maximum extent.
However, precisely because of the transformer coupling method, its regulation accuracy is inferior to that of secondary-side control. In addition, the voltage drop of the secondary-side diode will cause inconsistency between the output voltage and the sampling voltage. Meanwhile, the dynamic performance of primary-side control is also not as good as that of secondary-side control. Generally speaking, primary-side control is preferred for low-power (<40W) applications with low precision requirements, while secondary-side control is recommended for high-power applications.

SSR Controller Key Features

The secondary-side power controller achieves ultra-high precision, ultra-fast dynamic response and excellent stability by directly sampling the output voltage and feeding it back to the controller via an isolated method. Although its cost and complexity are slightly higher than those of the primary-side solution, its superior performance makes it the absolute mainstream and preferred solution for applications with stringent requirements for power supply quality. As electronic devices continue to impose higher requirements on power supply performance, the importance of the secondary-side architecture has become increasingly prominent.

Part Number	Shipments State	Features	Output Max Power （90Vac to 264Vac)	Power Siwtching Type	Vcc Operating Range	HV Current Source For Vcc Start	Protection	Package	Application
CR6910C	New Product	High-Efficiency QR + Valley-Lock Green Energy-Saving SiC Controller	150W	External SiC-MOSFET	16V to 32V	N	Cycle-by-cycle current limiting, OCP, OTP, VDD_OVP, UVLO, etc.; input undervoltage protection and high-/low-line power compensation can also be set through the DEM pin	SOT-23-6	Industrial, medical, security, and motor power adapters
CR6890H	Active Supply	CCM+PFM mode, external over-temperature protection, VDD overvoltage protection, output overvoltage protection latch function, and 15 ms frequency multiplication function	65W, Peak Power up to 150W @ 15 ms	External MOSFET	12V to 24V	N	Cycle-by-cycle current limiting, OCP, OTP, VDD_OVP, UVLO, etc.; external over-temperature protection and output overvoltage protection can be precisely set separately through the PRT pin	SOT-23-6	Industrial, medical, security, and motor power adapters
LD7793	New Product	Integrated Boost PFC and QR/PFM Flyback controller Voltage mode transition operation on PFC Current mode QR/PFM operation on Flyback Frequency swapping operation on Flyback	150W	External MOSFET	10V to 29.5V	Y	OVP (Over voltage protection) OCP (Cycle-by-cycle current limiting) Internal OTP function and external protection pin	SOP-16	Industrial, medical, and security power adapters
LD7790GS	Active Supply	Integrated PFC and QR Flyback Controller Transition Mode PFC Controller Quasi-Resonant Operation for Flyback Built-in X-CAP Discharging Brown IN/OUT Protection	150W	External MOSFET	10V to 29.5V	Y	External Latch Protection PFC Light Load Turn-off Control OVP (Over Voltage Protection) OCP (Cycle by cycle current limiting)	SOP-16	Industrial, medical, and security power adapters
LD5760WGR-1	Active Supply	High-Voltage (700V) Startup Circuit Operating Current: 0.25mA(VCOMP=0) Built-in Brown-in/out Function on HV pin Gate Source/Sink Capability: +300mA/-800mA @ output pin with 33nF capacitor.	120W	External MOSFET	8.5V to 26V	Y	OLP (Over Power Protection) OSCP(Output Short Circuit Protection) SDSP (Secondary Diode Short Protection) OVP (Over Voltage Protection) on VCC/CS	SOP-7	Industrial, medical, and security power adapters
CR6841	Not Recommended for New Product Designs	1. High-voltage startup, soft start, PWM controller; 2. Externally programmable switching frequency; 3. Unique variable frequency and frequency hopping operating modes in green mode; 4. No audible noise during operation;	120W	External MOSFET	10V to 26V	Y	VDD overvoltage protection; Built-in over-temperature protection, programmable external over-temperature protection; Built-in output short-circuit and overload overcurrent protection; Open-circuit protection for all functional pins (except GND).	SOP-8	High-power power adapters, battery chargers
CR5842	Active Supply	1. High voltage start, ultra-low standby power consumption, PWM controller; 2. Built-in soft-start technology to reduce the voltage stress of the power rate tube leakage source of the start-up MOSFET ; 3. Built-in fixed working frequency 65K; 4. No audio noise in operation;	120W	External MOSFET	10V to 26V	Y	VDD overvoltage protection and output overvoltage protection; Built-in short-circuit protection of the secondary rectifier tube; Built-in over-temperature protection, programmable external over-temperature protection; Built-in output short-circuit and overload overcurrent protection;	SOP-8	High-power power adapters, battery chargers
CR5843AS	Active Supply	1. High-efficiency CCM+PFM+QR, PWM controller; 2. High voltage start, ultra-low standby power consumption; 3. Built-in working frequency 65k, 145kHz frequency doubling working mode; 4. Built-in X_CAP discharge, saving X-capacitor discharge resistance; 5. Built-in frequency ±7% jitter function to reduce EMI	120W	External MOSFET	10V to 29V	Y	Programmable input undervoltage & overvoltage protection; VDD overvoltage protection and output overvoltage protection; Built-in short-circuit protection of the secondary rectifier tube; Built-in over-temperature protection, programmable external over-temperature protection; Built-in output short-circuit and overload overcurrent protection;	SOP-8	High-power power adapters, battery chargers
LD5762P/Q	Active Supply	High-Voltage (710V) Startup Circuit Built-in Brown-in/out Function on HV pin Built- in X-Cap Discharge on HV pin Adj. CS_OTP (Over Temperature Protection) Peak Load FSW Boost	60W to 120W Peak Load 150W to 300W	External MOSFET	8.5V to 26V	Y	OVP (Over Voltage Protection) on VCC/FB OPP (Over Power Protection) OCP (Over Current Protection) OSCP(Output Short Circuit Protection)	SOP-7/SOP-8	LPS printer power supply\motor type adapter