Combined Two-Switch Forward and Flyback Power Supply with Integrated High Voltage MOSFETs

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Figure 1. Simplified Schematic of Two-Switch Forward and Flyback Converters

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Product Details


The HiperTFS device family members incorporate both a high-power two-switch-forward converter and a mid-power flyback (standby) converter into a single, low-profile eSIP power package. The single chip solution provides the controllers for the two-switch-forward and flyback converters, high- and low-side drivers, all three of the high-voltage power MOSFETs, and eliminates the converter's need for costly external pulse transformers. The device is ideal for high power applications that require both a main power converter (two-switch forward) up to 414 W, and standby converter (flyback) up to 20 W. HiperTFS includes Power Integrations' standard set of comprehensive protection features, such as integrated soft-start, fault and over-load protection, and hysteretic thermal shutdown. HiperTFS utilizes advanced power packaging technology that simplifies the complexity of two-switch forward layout, mounting and thermal management, while providing very high power capabilities in a single compact package. The devices operate over a wide input voltage range, and can be used following a power-factor correction stage such as HiperPFS.

Product Highlights

Key Benefits

  • Single chip solution for two-switch forward main and flyback standby
  • High integration allows smaller form factor and higher power density designs
    • Incorporates control, gate drive, and three HV power MOSFETs
    • Level shift technology eliminates need for pulse transformer
    • Protection features include: UV, OV, OTP, OCP, & SCP
  • Transformer reset control
    • Prevents transformer saturation under all conditions
  • Allows >50% duty cycle operation
    • Reduces primary side RMS currents & conduction losses
  • Standby supply provides built-in overload power compensation
  • Up to 434 W total output power in a highly compact package
    • Up to 550 W peak
    • High efficiency solution easily enables design to meet stringent efficiency specifications.
    • >90% efficiency at full load
    • No-load regulation and low losses at light-load
  • Simple clip mounting to heat sink without need for insulation pad
  • Halogen free and RoHS compliant


  • PC
  • Printer
  • LCD TV
  • Video game consoles
  • High power adaptors
  • Industrial & appliance


Power Table

Output Power Table1
PRODUCT2 Two-Switched Forward
380 V
100 V - 400 V
(25 °C)
(50 °C)
(50 °C)
50 °C
TFS757HG 193 W 163 W 228 W 20 W
TFS758HG 236 W 200 W 278 W 20 W
TFS759HG 280 W 235 W 309 W 20 W
TFS760HG 305 W 258 W 358 W 20 W
TFS761HG 326 W 276 W 383 W 20 W
TFS762HG 360 W 304 W 407 W 20 W
TFS763HG 388 W 327 W 455 W 20 W
TFS764HG 414 W 344 W 530 W 20 W

Table 1. Output Power Table.


  1. Maximum practical continuous power in an open frame design with adequate heat sinking (assuming heat sink ΘC-A of <4 °C/W), measured at specified ambient temperature (see Key Applications Considerations for more information).
  2. Package: H: eSIP16/12. (Note: Direct attach to heat sink, does not require insulation SIL pad)

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