STR-W6700/X6700 Series Application Manual is a switching power supply integrated circuit launched by Sanken Electric Co., Ltd. It has an internal power MOSFET and controller, and works in quasi-resonant mode.
This manual describes the STR-W6700 and STR-X6700 series integrated circuits, which are quasi‑resonant switch‑mode power supply controllers that integrate MOSFETs and a controller for high‑efficiency, low‑noise operation. It includes product overview, key features, a series overview table, package drawings, and block diagrams.
The document also details pin functions, electrical specifications, standby gap‑oscillation operation, Bottom‑Skip quasi‑resonant mode, step‑driver circuitry, and maximum ON‑time limitation, along with several example application circuits to aid designers. This manual is written in Chinese.
| Control Supply Voltage (VCC) | 35 V |
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The series uses a gap‑oscillation standby mode that reduces power consumption by switching to a low‑voltage operation when the output voltage drops.
The maximum ON‑time is limited to about 32 µs (≈70 % of the oscillation period) to prevent excessive low‑frequency oscillation during low‑input‑voltage conditions.