PFS757 Datasheet PDF - Power Integrations

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PFS757
Power Integrations

Part Number PFS757
Description (PFS757 - PFS764) Combined Two-Switch Forward and Flyback Power Supply Controllers
Page 30 Pages


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TFS757-764HG
HiperTFSFamily
Combined Two-Switch Forward and Flyback Power Supply Controllers
with Integrated High Voltage MOSFETs
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 drivers, and three power
MOSFETS
Level shift technology eliminates need for pulse transformer
Protection features include: UV, OV, OTP, OCP, and SCP
Transformer reset control
Prevents transformer saturation under all conditions
Allows >50% duty cycle operation
Reduces primary side RMS currents and 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
Applications
PC
Printer
LCD TV
Video game consoles
High-power adapters
Industrial and appliance high-power adapters
Output Power Table
Product
TFS757HG
TFS758HG
TFS759HG
TFS760HG
TFS761HG
TFS762HG
TFS763HG
TFS764HG
Two-Switched Forward
380 V
Continuous Continuous
(25 °C)
(50 °C)
Peak
(50 °C)
193 W
163 W
228 W
236 W
200 W
278 W
280 W
235 W
309 W
305 W
258 W
358 W
326 W
276 W
383 W
360 W
304 W
407 W
388 W
327 W
455 W
414 W
344 W
530 W
Table 1. Output Power Table (See Notes on page 13).
Flyback
100 V - 400 V
50 °C
20 W
20 W
20 W
20 W
20 W
20 W
20 W
20 W
HiperTFS VDDH
L
HD
HS
D
DC
Input
Control,
Gate Drivers,
FB Level Shift
R
DSB
FB
EN
EN
BP
GS
Figure 1. Simplified Schematic of Two-Switch Forward and Flyback Converter.
www.powerint.com
Two-Switch Forward
Transformer
Flyback
Transformer
Main Output
Auxiliary/Standby
Output
RTN
EN FB
PI-6200-102910
February 2011



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TFS757-764HG
Section List
Description................................................................................................................................................................... 3
Product Highlights....................................................................................................................................................... 3
Pin Functional Description.......................................................................................................................................... 5
Pin Configuration....................................................................................................................................................... 5.
Functional Block Diagram......................................................................................................................................6-7.
Functional Description ................................................................................................................................................ 8
Output Power Table................................................................................................................................................ 13
Design, Assembly, and Layout Considerations..................................................................................................... 14
Application Example.................................................................................................................................................. 20
Absolute Maximum Ratings...................................................................................................................................... 23
Parameter Table...................................................................................................................................................... 23
Typical Performance Characteristics..................................................................................................................29-33.
Package Details ......................................................................................................................................................... 34
Part Ordering Information......................................................................................................................................... 35
Part Marking Information ......................................................................................................................................... 35
2
Rev. C 02/11
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TFS757-764HG
Description
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 comprehen-
sive 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.
Two-switch-forward power converters are often selected for
applications demanding cost-effective efficiency, fast transient
response, and accurate tolerance to line voltage fluctuation. The
two-switch-forward controller incorporated into HiperTFS
devices improves on the classic topology by allowing operation
considerably above 60% duty cycle. This improvement reduces
RMS currents conduction losses, minimizes the size and cost of
the bulk capacitor, and minimizes output diode voltage ratings.
The advanced design also includes transformer flux reset
control (saturation protection) and charge-recovery switching of
the high-side MOSFET, which reduces switching losses. This
combination of innovations yields an extremely efficient power
supply with smaller MOSFETs, fewer passives and discrete
components, and a lower-cost transformer.
HiperTFS’s flyback standby controller and MOSFET solution is
based on the highly popular TinySwitch™ technology used in
billions of power converter ICs due to its simplicity of operation,
light load efficiency, and rugged, reliable, performance. This
flyback converter can provide up to 20 W of output power and
the built in overload power compensation reduces component
design margin.
Product Highlights
Protected Two-Switch Forward and
Flyback Combination Solution
Incorporates three high-voltage power MOSFETs, main and
standby controllers, and gate drivers
Level shift technology eliminates need for pulse transformer
Programmable line undervoltage (UV) detection prevents
turn-off glitches
Programmable line overvoltage (OV) detection; latching and
non-latching
Accurate hysteretic thermal shutdown (OTP)
Accurate selectable current limit (main and standby)
Output over-current protection (OCP)
Fully integrated soft-start for minimum start-up stress
Simple fast AC reset
Reduced EMI
Synchronized 66 kHz forward and 132 kHz flyback
converters
Frequency jitter
Eliminates up to 30 discrete components for higher reliability
and lower cost
Asymmetrical Two-Switch Forward Reduces Losses
Allows >50% duty cycle operation
Reduces primary side RMS currents and conduction losses
Minimizes the size and cost of the bulk capacitor
Allows reduced capacitance or longer hold-up time
Allows lower voltage output diodes
Transformer reset control
Prevents transformer saturation under all conditions
Extends duty cycle to satisfy AC cycle drop out ride through
Duty cycle soft-start with 115% current limit boost
Satisfies 2 ms ~ 20 ms start-up with large capacitance at
output
Output short circuit protection (SCP) with auto-restart
Remote ON/OFF function
Voltage mode controller with current limit
20 W Flyback with Selectable Power Limit
TinySwitch-III based converter
Selectable power limit (10 W, 12.5 W, 15 W, or 20 W)
Built-in overload power compensation
Flat overload power vs. input voltage
Reduces component stress during overload conditions
Reduces required design margin for transformer and output
diode
Output overvoltage (OV) protection with fast AC reset
Latching, non-latching, or auto-restart
Auto-restart
Advanced Package for High Power Applications
434 W output power capability in a highly compact package
Up to 550 W peak
Simple clip mounting to heat sink
Can be directly connected to heat sink without insulation pad
Provides thermal impedance equivalent to a TO-220
Heat slug connected to ground potential for low EMI
Staggered pin arrangement for simple routing of board traces
and high-voltage creepage requirements
Single power package for two power converters reduces
assembly costs layout size
www.powerint.com
3
Rev. C 02/11



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TFS757-764HG
Function
Nominal Duty Cycle
Maximum Duty Cycle
Switch Current (RMS)
Output Catch Diode
Typical Two-Switch
Forward
33%
<50%
100%
VO + VD/DMAX
HiperTFS
45%
63%
83%
VO + VD/DMAX
Clamp Voltage
Thermal Shutdown
Current Sense Resistor
High-Side Drive
Component Count
TinySwitch Overload Power
Compensation vs. Input Voltage
Package Creepage
Package Assembly
Reset diodes from zero
to VIN
---
0.5 V drop (0.33 W at
300 W)
Requires gate-drive
transformer (high cost)
Higher
---
Reset from zero to
(VIN + 130)
118 °C Shutdown /
55 °C hysteresis
Sense resistor not
required
Built in high-side drive
Lower
Built-in compensation
TO-220 = 1.17 mm
2 × TO-220 package, 2
× SIL (insulation)
eSIP16/12 = 2.3 mm/
3.3 mm
1 Package
Table 2. Summary of Differences Between HiperTFS and Other Typical High Power Supplies.
Advantages of HiperTFS
Wider duty cycle reduces RMS switch currents by 17%.
Reduces RDS(ON) losses by 31%
Lower losses. Wider DMAX lowers catch diode rating by
(1-(50%/63%)) = 21% reduction in catch diode voltage
rating
With fast/slow diode combination, allows charge
recovery to limit high-side COSS loss
HiperTFS provides integrated OTP device protection
Improved efficiency. MOSFET RDS(ON) sense eliminated
need for sense resistor
Lower cost; component elimination. Removes
high-cost gate-drive transformer (EE10 or toroid)
Saves up to 50 components, depending on specification.
Safer design; easier to design power supply. Flattens
overload output power over line voltages
HiperTFS meets functional safety spacing at package
pins
No SIL (insulation) pad required
4
Rev. C 02/11
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PFS757 (PFS757 - PFS764) Combined Two-Switch Forward and Flyback Power Supply Controllers PFS757
Power Integrations
PFS757 pdf

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