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Power Integrations

TFS7705 Datasheet Preview

TFS7705 Datasheet

Combined Two-Switch Forward and Flyback Power Supply Controllers

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TFS7701-7708
HiperTFS-2 Family
Combined Two-Switch Forward and Flyback Power Supply Controllers
with Integrated High-Voltage MOSFETs
Product Enhancements
Selectable 132 kHz main switching frequency for lower cost
and smaller magnetics
Increased main peak power vs. HiperTFS-1
Self-biased high-side driver eliminates high-side bias winding
and diode
Package lead form and pinout modified for easier insertion and
PC-board layout
TImigphrtoevreUdVs(OtaN)nsdtabnydnboy-ltohardespheorlfdortmolearnacnece
Key Benefits
Single IC solution for two-switch forward main (66 kHz/132 kHz)
and flyback (132 kHz) standby
High integration allows smaller form factor and higher power
density designs, with reduced component count
Incorporates control, gate drivers, and three power MOSFETs
Level shift technology eliminates need for pulse transformer
Protection features include: UV, OV, OTP, OVP, standby OPC,
STrCanPs, faonrmd eILrIMrIeT set control, prevents saturation under all conditions
Main duty cycle operation above 50% for reduced rms currents
and lower output diode voltage rating
Less than 10% variation in standby overload power over input
voltage range
+
HiperTFS-2 VDDH
HD
HS
Two-Switch
Forward
Transformer
Up to 586 W peak output power in a highly compact package
>90% efficiency at full load
Simple clip mounting to heat sink without need for insulation pad
Halogen free and RoHS compliant
Typical Applications
PC (80 PLUS® Bronze and 80 PLUS Silver)
Printer
LCD TV
Video game consoles
High-power adapters
Industrial and appliance
Output Power Table
Product 3
TFS7701H
TFS7702H
TFS7703H
TFS7704H
TFS7705H
TFS7706H
TFS7707H
TFS7708H
Two-Switch Forward
380 V
Continuous1
(50 °C)
Peak2
148 W
187 W
190 W
297 W
229 W
375 W
251 W
419 W
269 W
466 W
298 W
513 W
322 W
553 W
343 W
586 W
Flyback
100 V - 400 V
Continuous
(50 °C)
20 W
20 W
20 W
20 W
20 W
20 W
20 W
20 W
Table 1. Output Power Table.
Notes:
1. Maximum practical continuous power in an open frame design with adequate
heat sinking to maintain a heat sink temperature ≤95 ºC (see Key Applications
Considerations for more information) measured at specified ambient temperature.
2 Peak load less than 10 seconds and average power less than maximum
continuous load.
3. Package: eSIP-16F. (Note: Direct attach to heat sink, does not require insulation
SIL pad).
Main
Output
R
DC Input
(VDC)
L
FB
EN
FB
EN
G
D
DSB
BP
S
Standby Flyback
Transformer
Standby
Output
**
**
EN FB
RTN
eSIP-16F (H Package)
Figure 2. Package Option.
Figure 1. Schematic of Two-Switch Forward and Flyback Converter.
*Simpli ed feedback circuit
PI-7078-082213
www.power.com
This Product is Covered by Patents and/or Pending Patent Applications.
April 2015




Power Integrations

TFS7705 Datasheet Preview

TFS7705 Datasheet

Combined Two-Switch Forward and Flyback Power Supply Controllers

No Preview Available !

TFS7701-7708
Section List
Description................................................................................................................................................................... 3
Product Highlights....................................................................................................................................................... 3
Pin Functional Description.......................................................................................................................................... 5
Pin Configuration....................................................................................................................................................... 5
Functional Block Diagram......................................................................................................................................6-7
Functional Description ................................................................................................................................................ 8
Design, Assembly and Layout Considerations...................................................................................................... 14
Layout Considerations............................................................................................................................................... 17
Transformer Secondary and Output Diodes............................................................................................................ 21
Main Converter Typical Waveforms.......................................................................................................................... 22
Quick Design Checklist.............................................................................................................................................. 23
Design Example.......................................................................................................................................................... 25
Absolute Maximum Ratings...................................................................................................................................... 27
Parameter Table...................................................................................................................................................... 27
Package Details ......................................................................................................................................................... 34
Part Ordering Information......................................................................................................................................... 40
Part Marking Information ......................................................................................................................................... 41
2
Rev. B 04/15
www.power.com


Part Number TFS7705
Description Combined Two-Switch Forward and Flyback Power Supply Controllers
Maker Power Integrations
Total Page 30 Pages
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