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Número de pieza TFS757HG
Descripción (PFS757 - PFS764) Combined Two-Switch Forward and Flyback Power Supply Controllers
Fabricantes Power Integrations 
Logotipo Power Integrations Logotipo



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No Preview Available ! TFS757HG Hoja de datos, Descripción, Manual

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

1 page




TFS757HG pdf
TFS757-764HG
Pin Functional Description
MAIN DRAIN (D) Pin
Drain of the low-side MOSFET transistor forward converter.
STANDBY DRAIN (DSB) Pin
Drain of the MOSFET of standby power supply.
GROUND (G) Pin
This pin gives a signal current path to the substrate of the
low-side controller. This pin is provided to allow a separate
Kelvin connection to the substrate of the low-side controller to
eliminate inductive voltages that might be developed by high
switching currents in the SOURCE pin. The GROUND pin is
not intended to carrier high currents, instead it is intended as a
voltage-reference connection only.
SOURCE (S) Pin
SOURCE pin that is common to both the standby and main
supplies.
RESET (R) Pin
This pin provides information to limit the maximum duty cycle as a
function of the current fed into the RESET pin during the off-time
of the main converter MOSFET. This pin can also be pulled up to
bypass to signal remote ON/OFF of the main converter only.
ENABLE (EN) Pin
This is the ENABLE pin for the standby controller. Prior to the
start-up a resistor connected from ENABLE to BYPASS, can be
detected to select one of several internal current limits.
LINE-SENSE (L) Pin
This pin provides input bulk voltage line-sense function. This
information is used by the undervoltage and overvoltage
detection circuits for both main and standby. The pin can also
be pulled up to BYPASS or be pulled down to SOURCE to
implement a remote ON/OFF of both standby and main
supplies simultaneously. The LINE-SENSE pin works in
conjunction with the RESET pin to implement a duty-cycle limit
function. Also the LINE-SENSE pin compensates the value of
standby current limit so as to flatten the output overload
response as a function of input voltage.
FEEDBACK (FB) Pin
This pin provides feedback for the main two transistor forward
converter. An increase in current sink from FEEDBACK pin to
ground, will lead to a reduction in operating duty cycle. This pin
also selects the main device current limit at start-up (in a similar
manner to ENABLE pin).
BYPASS (BP) Pin
This is the decoupled operating voltage pin for the low-side
controller. At start-up the bypass capacitor is charged from an
internal device current source. During normal operation the
capacitor voltage is maintained by drawing current from the
low-side bias winding on the standby power supply. This pin is
also used to implement remote ON/OFF for the main controller.
This is done by driving extra current into the BYPASS pin when
we want to turn-on the Main controller. The BYPASS pin also
implements a latch-off function to disable standby and main
when the BP pin current exceeds latching threshold. Latch is
reset when LINE-SENSE pin falls below UV (off) standby
threshold.
HIGH-SIDE OPERATING VOLTAGE (VDDH) Pin
This is the high-side bias (VDD) of approximately 11.5 V. This
voltage is maintained with current from a high-side bias winding
on the main transformer and/or from a bootstrap diode from the
low-side standby bias supply.
HIGH-SIDE SOURCE (HS) Pin
SOURCE pin of the high-side MOSFET.
HIGH-SIDE DRAIN (HD) Pin
DRAIN pin of the high-side MOSFET. This MOSFET is floating
with respect to low-side source and ground.
H Package (eSIP-16/12)
Exposed Metal
(On Edge)
Internally
Connected
1 3 5 6 7 8 9 10 11 13 14 16
Figure 2. Pin Configuration.
Exposed Pad
(Backside) Internally
Connected to SOURCE
Pin (see eSIP-16B
Package Drawing)
PI-5290-110510
www.powerint.com
5
Rev. C 02/11

5 Page





TFS757HG arduino
TFS757-764HG
VIN
385 V
315 V
100 V
30 V
Supply Start-Up Sequence
Standby Power General Introduction
The standby is a wide range power supply, typically a flyback
converter, operating over a wide input range (85-265 VAC) and
delivering up to 20 W continuous output power. The standby
power supply provides two functions in most high-power
applications. It provides a direct secondary output but also
provide bias power to other primary-side devices (in particular
typically a PFC boost converter).
The HiperTFS standby retains most features of the TinySwitch-III,
such as auto-restart, thermal shutdown, multi-level current limit
ON/OFF control, etc. The HiperTFS standby controller has a
few differences versus TinySwitch-III:
Standby
Output
Main
Output
12 ms 2-20 ms
VBP
5.7 V
4.7 V
6.0 V
PI-5611a-062710
Figure 10. Main and Standby Start-Up.
Main Reset Overvoltage Detection
There is also an overvoltage threshold for the RESET pin. When
triggered, the RESET overvoltage will shutdown only the Main,
leaving the Standby in operation.
VIN
385 V
300 V
240 V
40 V
Standby
Output
To VIN To Clamp
Reset Circuit
RL RR
R
L
1. There are 4 current limits that are selected via the ENABLE
pin (rather than by using different BYPASS pin capacitors as
in TinySwitch-III). There are 4 user selectable current limits
500, 550, 650, 750 mA design for secondary standby
output power of 10, 12.5, 15 and 20 W.
2. Secondary OVP latching shutdown. This is triggered via a
current in excess of the BYPASS pin latching shutdown
3. tDheredsichaoteldd(LIBIPN(SED)-=SE1N5SmEAp).in for line-voltage detection providing
absolute UV and OV ON/OFF thresholds (unlike TinySwitch-III
which detects input voltage only during restart).
4. Current limit is compensated as a function of input voltage
to maintain a flat overload characteristic versus input voltage.
In a high-power system, the standby power supply is the first
power supply to begin operating. The main converter cannot
begin working until the standby is in operation. Likewise the
main converter will shutdown at a higher-voltage than the standby
and thus the standby is always the last power supply to
shutdown.
Standby On-Chip Current Limit with External Selection
During start-up, the FEEDBACK pin and ENABLE pin are both
used to select internal current limits for the Main and Standby
converters respectively. The detection period occurs at the
initial start-up of the device (just after BYPASS pin voltage of
4.7 V is achieved), and before the main or standby MOSFETs
start switching. This is done to minimize noise interference.
I EN
(Threshold)
0.0-8.5 mA
8.5-17.7 mA
17.7-33.0 mA
33.0-66.0 mA
L1
L2
L3
L4
ILIMIT
R EN (Select)
(1%)
500 mA Open kW
650 mA 280.0 kW
750 mA 137.0 KW
550 mA 63.4 kW
Main
Output
tHO2L0DmUPs
t1 t2
Typically turned off by
secondary supervisor
circuit, once regulation
below limit
t3 t4
PI-5612a-060910
Figure 11. L and R Pin Duty Limit Mode.
Table 4. ENABLE Pin Standby Current Limit Selection.
The ENABLE pin works in a similar way to the FEEDBACK pin
selection. The only difference being that the ENABLE pin is not
clamped to 1 V during selection, instead remaining at 2.35 V
during the detection period. Thus the selection resistor values
www.powerint.com
11
Rev. C 02/11

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