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TNY287P 데이터시트 PDF




Power Integrations에서 제조한 전자 부품 TNY287P은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 TNY287P 기능
기능 (TNY284 - TNY290) Off-Line Switcher
제조업체 Power Integrations
로고 Power Integrations 로고


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TNY287P 데이터시트, 핀배열, 회로
TNY284-290
TinySwitch-4 Family
Energy-Efficient, Off-Line Switcher with
Line Compensated Overload Power
Product Highlights
Lowest System Cost with Enhanced Flexibility
725 V rated MOSFET
Increases BV de-rating margin
Line compensated overload power – no additional components
Dramatically reduces max overload variation over universal input
voltage range
±5% turn on UV threshold: line voltage sense with single external
resistor
Simple ON/OFF control, no loop compensation needed
Selectable current limit through BP/M capacitor value
Higher current limit extends peak power or, in open frame
applications, maximum continuous power
Lower current limit improves efficiency in enclosed adapters/
chargers
Allows optimum TinySwitch-4 choice by swapping devices with no
other circuit redesign
Tight I2f parameter tolerance reduces system cost
Maximizes MOSFET and magnetics utilization
ON-time extension – extends low-line regulation range/hold-up time
to reduce input bulk capacitance
Self-biased: no bias winding or bias components
Frequency jittering reduces EMI filter costs
Pin-out simplifies heat sinking to the PCB
SOURCE pins are electrically quiet for low EMI
Enhanced Safety and Reliability Features
Accurate hysteretic thermal shutdown protection with automatic
recovery eliminates need for manual reset
Auto-restart delivers <3% of maximum power in short-circuit and
open loop fault conditions
Output overvoltage shutdown with optional Zener
Fast AC reset with optional UV external 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 <30 mW with bias winding, <150 mW at 265 VAC without
bias winding
ON/OFF control provides constant efficiency down to very light loads
– ideal for mandatory CEC regulations and EuP standby requirements
Applications
PC Standby and other auxiliary supplies
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc
Chargers/adapters for cell/cordless phones, PDAs, digital cameras,
MP3/portable audio, shavers, etc.
+
Wide-Range
High-Voltage
DC Input
D
TinySwitch-4
S
EN/UV
BP/M
Figure 1. Typical Standby Application.
+
DC
Output
PI-6578-020915
SO-8C (D Package)
DIP-8C (P Package)
Figure 2. Package Options.
eSOP-12B (K Package)
Output Power Table
Product3
230 VAC ± 15%
Adapter1
Peak or
Open
Frame2
85-265 VAC
Adapter1
Peak or
Open
Frame2
TNY284P/D/K
TNY285P/D
TNY285K
6W
8.5 W
11 W
11 W
15 W
15 W
5W
6W
7.5 W
8.5 W
11.5 W
11.5 W
TNY286P/D
10 W
19 W
7W
15 W
TNY286K
13.5 W
19 W
9.5 W
15 W
TNY287P
13 W
23.5 W
8W
18 W
TNY287D
11.5 W
23.5 W
7W
18 W
TNY287K
TNY288P
TNY288D
TNY288K
TNY289P
18 W
16 W
14.5 W
23 W
18 W
23.5 W
28 W
26 W
28 W
32 W
11 W
10 W
9W
14.5 W
12 W
18 W
21.5 W
19.5 W
21.5 W
25 W
TNY289K
25 W
32 W
17 W
25 W
TNY290P
20 W
36.5 W
14 W
28.5 W
TNY290K
28 W
36.5 W
20 W
28.5 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 heat sink will increase power
capability.
2. Minimum peak power capability in any design or minimum continuous power
in an open frame design (see Key Applications Considerations).
3. Packages: P: DIP-8C, D: SO-8C, K: eSOP-12B. See Part Ordering Information.
www.power.com
This Product is Covered by Patents and/or Pending Patent Applications.
February 2015




TNY287P pdf, 반도체, 판매, 대치품
TNY284-290
Current Limit
The current limit circuit senses the current in the power MOSFET.
When this current exceeds the internal threshold (ILIMIT), the power
MOSFET is turned off for the remainder of that cycle. The current
limit state machine reduces the current limit threshold by discrete
amounts under medium and light loads.
The leading edge blanking circuit inhibits the current limit comparator
for a short time (tLEB) after the power MOSFET is turned on. This
leading edge blanking time has been set so that current spikes
caused by 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-4 enters into
auto-restart operation. An internal counter clocked by the oscillator
is reset every time the ENABLE/UNDERVOLTAGE pin is pulled low.
If the ENABLE/UNDERVOLTAGE pin is not pulled low for 64 ms, the
power MOSFET switching is normally disabled for 2.5 seconds (except
in the case of line undervoltage condition, in which case it is disabled
until the condition is removed). The auto-restart alternately enables
and disables the switching of the power MOSFET until the fault
condition is removed. Figure 6 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 2.5 seconds 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 after the
DCMAX signal goes low. This feature reduces the minimum input
voltage required to maintain regulation, extending hold-up time and
minimizing the size of bulk capacitor required. The on-time extension
is disabled during the start-up of the power supply, 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 ENABLE/UNDERVOLTAGE pin. During
power-up or when the switching of the power MOSFET is disabled in
auto-restart, the current into the ENABLE/UNDERVOLTAGE pin must
exceed 25 μA to initiate switching of the power MOSFET. During
power-up, this is accomplished by holding the BYPASS/MULTI-
300
200
100
0
10
5
0
VDRAIN
VDC-OUTPUT
0 2500
Time (ms)
Figure 6. Auto-Restart Operation.
5000
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. 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 2.5 seconds until
the line undervoltage condition ends.
The line undervoltage circuit also detects when there is no external
resistor connected to the ENABLE/UNDERVOLTAGE pin (less than
~2 μA into the pin). In this case the line undervoltage function is
disabled.
TinySwitch-4 Operation
TinySwitch-4 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. Since the
highest current limit level and frequency of a TinySwitch-4 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-4 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.
Enable Function
TinySwitch-4 senses the ENABLE/UNDERVOLTAGE pin to determine
whether or not to proceed with the next switching cycle. The
sequence of cycles is used to determine the current limit. Once a
cycle is started, it always completes the cycle (even when the
ENABLE/UNDERVOLTAGE pin changes state half way through the
cycle). This operation results in a power supply in which the output
voltage ripple is determined by the output capacitor, amount of
energy per switch cycle and the delay of the feedback.
The ENABLE/UNDERVOLTAGE pin signal is generated on the
secondary by comparing the power supply output voltage with a
reference voltage. The ENABLE/UNDERVOLTAGE pin signal is high
when the power supply output voltage is less than the reference
voltage. In a typical implementation, the ENABLE/UNDERVOLTAGE
pin is driven by an optocoupler. The collector of the optocoupler
transistor is connected to the ENABLE/UNDERVOLTAGE pin and the
emitter is connected to the SOURCE pin. The optocoupler LED is
connected in series with a Zener diode across the DC output voltage
to be regulated. When the output voltage exceeds the target
regulation voltage level (optocoupler LED voltage drop plus Zener
voltage), the optocoupler LED will start to conduct, pulling the
ENABLE/UNDERVOLTAGE pin low. The Zener diode can be replaced
by a TL431 reference circuit for improved accuracy.
ON/OFF Operation with Current Limit State Machine
The internal clock of the TinySwitch-4 runs all the time. At the
beginning of each clock cycle, it samples the ENABLE/UNDERVOLTAGE
pin to decide whether or not to implement a switch cycle, and based
on the sequence of samples over multiple cycles, it determines the
appropriate current limit. At high loads, the state machine sets the
current limit to its highest value. At lighter loads, the state machine
sets the current limit to reduced values.
At near maximum load, TinySwitch-4 will conduct during nearly all of
its clock cycles (Figure 7). At slightly lower load, it will “skip”
additional cycles in order to maintain voltage regulation at the power
supply output (Figure 8). At medium loads, cycles will be skipped and
the current limit will be reduced (Figure 9). At very light loads, the
current limit will be reduced even further (Figure 10). Only a small
4
Rev. C 02/15
www.power.com

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TNY287P 전자부품, 판매, 대치품
TNY284-290
BYPASS/MULTI-FUNCTION Pin Capacitor
The BYPASS/MULTI-FUNCTION pin can use a ceramic capacitor as
small as 0.1 μF for decoupling the internal power supply of the
device. A larger capacitor size can be used to adjust the current limit.
For TNY285-290, a 1 μF BYPASS/MULTI-FUNCTIONAL pin capacitor
will select a lower current limit equal to the standard current limit of
the next smaller device and a 10 μF BYPASS/MULTI-FUNCTIONAL pin
capacitor will select a higher current limit equal to the standard
current limit of the next larger device. The higher current limit level
of the TNY290 is set to 850 mA typical. The TNY284 MOSFET does
not have the capability for increased current limit so this feature is
not available in this device.
40
35
30
25
TNY290
TNY280
20
85 100 115 130 145 160 175 190 205 220 235 250 265
Input Voltage (VAC)
Figure 15. Comparison of Maximum Overpower for TinySwitch-4 and
TinySwitch-III as a Function of Input Voltage (Data Collected from
RDK-295 20 W Reference Design).
www.power.com
7
Rev. C 02/15

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