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기능 Off-Line Switcher
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TNY377PN 데이터시트, 핀배열, 회로
TNY375-380
TinySwitch®-PK Family
Energy-Efficient, Off-Line Switcher With
Enhanced Peak Power Performance
Product Highlights
Lowest System Cost with Enhanced Flexibility
Simple ON/OFF control, no loop compensation needed
Unique Peak Mode feature extends power range without
increasing transformer size
Maximum frequency and current limit boosted at peak loads
Selectable current limit through BP/M capacitor value
Higher current limit extends maximum power in open frame
Lower current limit improves efficiency in enclosed adapters
Allows optimum TinySwitch-PK choice by swapping devices
with no other circuit redesign
Tight I2f parameter tolerance reduces system cost
Maximizes MOSFET and magnetics power delivery
ON time extension – typically extends low line regulation range/
hold-up time to reduce input bulk capacitance
Self-biased: no bias winding required for TNY375-376; winding
required for TNY377-380
Frequency jittering reduces EMI filter costs
Optimized pin out eases pcb/external heatsinking
Quiet source-connected heatsink pins for low EMI
Enhanced Safety and Reliability Features
Accurate hysteretic thermal shutdown with automatic recovery
provides complete system level overload protection and
eliminates need for manual reset
Auto-restart delivers <3% maximum power in short circuit and
open loop fault conditions
Output overvoltage shutdown with optional Zener
Line undervoltage detect threshold set using a single resistor
Very low component count enhances reliability and enables
single sided printed circuit board layout
High bandwidth provides fast turn on with no overshoot and
excellent transient load response
Extended creepage between DRAIN and all other pins improves
field reliability
EcoSmart®– Extremely Energy Efficient
Easily meets all global energy efficiency regulations
No-load <170 mW at 265 VAC without bias winding, <60 mW
with bias winding
ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC efficiency regulations and 1 W
PC standby requirements
Applications
Applications with high peak-to-continuous power demands –
DVDs, PVRs, active speakers (e.g. PC audio), audio amplifiers,
modems, photo printers
Applications with high power demands at startup (large output
capacitance or motor loads) - PC standby, low voltage motor
drives
AC +
IN DC
OUT
D
TinySwitch-PK
S
EN/UV
BP/M
Figure 1. Typical Peak Power Application.
PI-4266-010906
Output Power Table
Product3
230 VAC ± 15%
Adapter1
Open
Frame2
Peak
85-265 VAC
Adapter1
Open
Frame2
Peak
TNY375PN
TNY376PN
TNY377PN
TNY378PN
TNY379PN
8.5 W
10 W
13 W
16 W
18 W
15 W
19 W
23.5 W
28 W
32 W
16.5 W
22 W
28 W
34 W
39 W
6W
7W
8W
10 W
12 W
11.5 W
15 W
18 W
21.5 W
25 W
12.5 W
17 W
23 W
27 W
31 W
TNY380PN 20 W 36.5 W 45 W 14 W 28.5 W 35 W
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +50 °C ambient. Use of an external heatsink will increase power
capability.
2. Minimum continuous power in an open frame design (see Key Applications
Considerations).
3. Packages: P: DIP-8C. Lead free only. See Part Ordering Information.
Description
TinySwitch-PK incorporates a 700 V MOSFET, oscillator, high-
voltage switched current source, current limit (user selectable),
and thermal shutdown circuitry. A unique peak mode feature
boosts current limit and frequency for peak load conditions. The
boosted current limit provides the peak output power while the
increased peak mode frequency ensures the transformer can be
sized for continuous load conditions rather than peak power
demands.
www.powerint.com
May 2007
www.DataSheet.in




TNY377PN pdf, 반도체, 판매, 대치품
TNY375-380
BYPASS/MULTI-FUNCTION Pin Undervoltage
The BYPASS/MULTI-FUNCTION pin undervoltage circuitry
disables the power MOSFET when the BYPASS/MULTI-
FUNCTION pin voltage drops below 4.9 V in steady state
operation. Once the BYPASS/MULTI-FUNCTION pin voltage
drops below 4.9 V in steady state operation, it must rise back to
5.85 V to enable (turn-on) the power MOSFET.
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature.
The threshold is typically set at 142 °C with 75 °C hysteresis.
When the die temperature rises above this threshold, the power
MOSFET is disabled and remains disabled, until the die
temperature falls by 75 °C, at which point it is re-enabled. A
large hysteresis of 75 °C (typical) is provided to prevent
overheating of the PC board due to a continuous fault condition.
Current Limit
The current limit circuit senses the current in the power
MOSFET. When this current exceeds the internal threshold
(cILyIMcIlTe),.
the power MOSFET is
The current limit state
turned of
machine
f for the remainder of that
reduces the current limit
threshold by discrete amounts under medium and light loads.
The leading edge blanking circuit inhibits the current limit
ctuormnepdaroanto. rTfohirsalesahdoinrtgtiemdege(tLbEBla) nafktienrgthtiempeohwaesrbMeeOnSsFeEtTsios
that current spikes caused by typical capacitance and
secondary-side rectifier reverse recovery time will not cause
premature termination of the switching pulse.
Auto-Restart
In the event of a fault condition such as output overload, output
short circuit, or an open loop condition, TinySwitch-PK enters
into auto-restart operation. An internal counter clocked by the
oscillator is reset every time the EN/UV pin is pulled low. If the
EN/UV pin is not pulled low for 8192 switching cycles
(or 32 ms), the power MOSFET switching is normally disabled
for 1 second (except in the case of line undervoltage condition,
in which case it is disabled until the condition is removed). The
300
V
DRAIN
200
100
0
10
5 VDC-OUTPUT
0
0 1000
Time (ms)
Figure 5. Auto-Restart Operation.
2000
auto-restart alternately enables and disables the switching of
the power MOSFET until the fault condition is removed.
Figure 5 illustrates auto-restart circuit operation in the presence
of an output short circuit.
In the event of a line undervoltage condition, the switching of
the power MOSFET is disabled beyond its normal 1 second
until the line undervoltage condition ends.
Adaptive Switching Cycle On-Time Extension
Adaptive switching cycle on-time extension keeps the cycle on
until current limit is reached, instead of prematurely terminating
amftineirmthuemDinCpMuAtX
signal goes low.
voltage required
This feature reduces the
to maintain regulation, typically
extending hold-up time and minimizing the size of bulk
capacitor required. The on-time extension is disabled during
the startup of the power supply, and after auto-restart, until the
power supply output reaches regulation.
Line Undervoltage Sense Circuit
The DC line voltage can be monitored by connecting an
external resistor from the DC line to the EN/UV pin. During
power-up or when the switching of the power MOSFET is
disabled in auto-restart, the current into the EN/UV pin must
exceed 25 mA to initiate switching of the power MOSFET.
During power-up, this is accomplished by holding the BYPASS/
MULTI-FUNCTION pin to 4.9 V while the line undervoltage
condition exists. The BYPASS/MULTI-FUNCTION pin then rises
from 4.9 V to 5.85 V when the line undervoltage condition goes
away. Once MOSFET switching is enabled, the DC line voltage
is ignored unless the power supply enters auto-restart mode in
the event of a fault condition. When the switching of the power
MOSFET is disabled in auto-restart mode and a line
undervoltage condition exists, the auto-restart counter is
stopped. This stretches the disable time beyond its normal
1 second until the line undervoltage condition ends.
The line undervoltage circuit also detects when there is no
external resistor connected to the EN/UV pin (less than ~1 mA
into the pin). In this case the line undervoltage function is
disabled.
TinySwitch-PK Operation
TinySwitch-PK devices operate in the current limit mode.
When enabled, the oscillator turns the power MOSFET on at the
beginning of each cycle. The MOSFET is turned off when the
current ramps up to the current limit or when the DCMAX limit is
reached (applicable when On-Time Extension is disabled).
Since the highest current limit level and frequency of a
TinySwitch-PK design are constant, the power delivered to the
load is proportional to the primary inductance of the transformer
and peak primary current squared. Hence, designing the
supply involves calculating the primary inductance of the
transformer for the maximum output power required. If the
TinySwitch-PK is appropriately chosen for the power level, the
current in the calculated inductance will ramp up to current limit
before the DCMAX limit is reached.

Rev. A 05/07
www.DataSheet.in
www.powerint.com

4페이지










TNY377PN 전자부품, 판매, 대치품
TNY375-380
reduced, and the clock frequency is reduced to half that at the
highest current limit level (Figure 8). At very light loads, the
current limit will be reduced even further (Figure 9). Only a small
percentage of cycles will occur to satisfy the power consumption
of the power supply. The response time of the ON/OFF control
scheme is very fast compared to PWM control. This provides
tight regulation and excellent transient response.
Power Up/Down
The TinySwitch-PK requires only a 0.1 mF capacitor on the
BYPASS/MULTI-FUNCTION pin to operate with standard
current limit. Because of its small size, the time to charge this
capacitor is kept to an absolute minimum, typically 0.6 ms. The
time to charge will vary in proportion to the BYPASS/MULTI-
FUNCTION pin capacitor value when selecting different current
limits. Due to the high bandwidth of the ON/OFF feedback,
there is no overshoot at the power supply output. When an
external resistor (4 MW) is connected from the power supply
positive DC input to the EN/UV pin, the power MOSFET
switching will be delayed during power-up until the DC line
voltage exceeds the threshold (100 V). Figures 10 and 11 show
the power-up timing waveform in applications with and without
an external resistor (4 MW) connected to the EN/UV pin.
During power-down, when an external resistor is used, the
power MOSFET will switch for 32 ms after the output loses
regulation. The power MOSFET will then remain off without any
glitches since the undervoltage function prohibits restart when
the line voltage is low.
Figure 12 illustrates a typical power-down timing waveform.
Figure 13 illustrates a very slow power-down timing waveform,
as in standby applications. The external resistor (4 MW) is
connected to the EN/UV pin in this case to prevent unwanted
restarts.
With the TNY375 and TNY376, no bias winding is needed to
provide power to the chip because it draws the power directly
from the DRAIN pin (see Functional Description above). This
eliminates the cost of a bias winding and associated
components. For the TNY377-380 or for applications that
require very low no-load power consumption (50 mW), a resistor
from a bias winding to the BYPASS/MULTI-FUNCTION pin can
provide the power to the chip. The minimum recommended
current supplied is
pin in this case will
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+clIaDmIS.pTehdeaBt 6Y.P4AVS.ST/MhisULmTeI-tFhUodNCwTillION
eliminate the power draw from the DRAIN pin, thereby reducing
the no-load power consumption and improving full-load
efficiency.
Current Limit Operation
Each switching cycle is terminated when the DRAIN current
reaches the current limit of the device. Current limit operation
provides good line ripple rejection and relatively constant power
delivery independent of input voltage.
BYPASS/MULTI-FUNCTION Pin Capacitor
The BYPASS/MULTI-FUNCTION pin can use a ceramic
capacitor as small as 0.1 mF for decoupling the internal power
supply of the device. A larger capacitor size can be used to
adjust the current limit. A 1 mF BP/M pin capacitor will select a
lower current limit equal to the standard current limit of the next
smaller device, and a 10 mF BP/M pin capacitor will select a
higher current limit equal to the standard current limit of the next
larger device. The TNY375 and TNY376 MOSFETs do not have
the capability to match the current limit of the next larger
devices in the family. The current limit is therefore increased to
the maximum capability of their respective MOSFETs. The
higher current limit level of the TNY380 is set to 1105 mA typical.
The smaller current limit of the TNY375 is set to 325 mA.
www.powerint.com
www.DataSheet.in

Rev. A 05/07

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