COSINE Tier-1 distributor Jarwey｜PWM controllers UC3842/SG3525 paths

Jarwey is a Tier-1 distributor of COSINE—selection support, datasheets, sampling & small batch, lead-time coordination.

COSINE PWM controllers for AC-DC/DC-DC with external FETs target adapters and voltage converters. Split peak-current-mode (UC384x class) vs voltage-mode (SG3525 class) below. Isolated push-pull transformer drivers (COS650x) are a separate catalog family—not covered here.

Datasheets from Jarwey. UC3842 / SG3525 are evaluation anchors only.

Product features

External-FET PWM control; adjustable frequency, current limit, and error amp (see datasheet).

Applications (vendor-stated)

Adapters and converters (catalog notes: COS3842 often in EV chargers; COS3845 in adapters; COS3525 in welders/inverters).

PWM controller table

Also listed: COS3843/3844/3845.

Checklist before freeze

1. Adapter / charger: is current-mode COS3842 enough?
2. Inverter / welder: voltage-mode COS3525 and sync pin.
3. External FET: drive strength and gate resistor.
4. Protection: limit, soft-start, UVLO in the datasheet.
5. Samples: request from Jarwey.

Pages & contact

• COS3842BD · COS3525ADW

Jarwey · COSINE Tier-1 distributor · kerry.w@jarwey.cn · Contact.