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What is TYN256P?

This electronic component, produced by the manufacturer "Power Integrations Inc.", performs the same function as "Energy Efficient/ Low Power Off-line Switcher".


TYN256P Datasheet PDF - Power Integrations Inc.

Part Number TYN256P
Description Energy Efficient/ Low Power Off-line Switcher
Manufacturers Power Integrations Inc. 
Logo Power Integrations  Inc. Logo 


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TNY256
TinySwitch TM Plus
Energy Efficient, Low Power Off-line Switcher
®
Product Highlights
TinySwitch Plus Features
Extended power range
Fully integrated auto-restart reduces short circuit current
Line under-voltage sense eliminates turn-off glitches
Frequency jittering dramatically reduces EMI (5 to 10 dB)
TO-220 package option
Lowest Cost, Low Power Switcher Solution
Lower cost than RCC, discrete PWM and other integrated/
hybrid solutions
Cost effective replacement for bulky linear adapters
Lowest component count
Simple ON/OFF control no loop compensation components
No bias winding simpler, lower cost transformer
Designed to work with low cost external components
Extremely Energy Efficient
Consumes only 30/60 mW at 115/230 VAC with no load
Meets Blue Angel, Energy Star, Energy 2000 and
200mW European cell phone requirements for standby
Saves $1 to $4 per year in energy costs (at $0.12/kWHr)
compared to bulky linear adapters
Ideal for cellular phone chargers and adapters
High Performance at Low Cost
High voltage powered ideal for charger applications
High bandwidth provides fast turn on with no overshoot
Current limit operation rejects line frequency ripple
Built-in current limit and thermal protection
Description
The TNY256 extends the power range of the TinySwitch family
of energy efficient, low power off-line switchers. TinySwitch
devices use a breakthrough design to provide the lowest cost,
high efficiency, off-line switching solution for low power
applications. They integrate a 700 V power MOSFET, oscillator,
high voltage switched current source, current limit and thermal
shutdown circuitry into a single, monolithic device. The devices
start-up and operate on power derived from the DRAIN voltage,
eliminating the need for a transformer bias winding and associated
circuitry. TinySwitch's low operating current allows power
supply no-load consumption to be kept under 100 mW, even at
265 VAC input.
+
Optional
UV Resistor
Wide-Range
HV DC Input
D
TinySwitch Plus
S
EN/UV
BP
Figure 1. Typical Standby Application.
+
DC Output
PI-2363-022699
OUTPUT POWER CAPABILITY*
ORDER
PART
NUMBER
PACKAGE
230 VAC or
115 VAC
w/Doubler
85-265
VAC
TNY256P
TNY256G
TNY256Y
DIP-8
SMD-8
TO-220-7B
8-15 W
8-19 W
5-10 W
5-11 W
Table 1. * The low end of the power ranges shown represent enclosed
adapters with minimal heat sinking whereas, the high end of the power
ranges represent open frame power supplies with adequate heat
sinking, both measured at an ambient of 50 oC. Please refer to the Key
Application Considerations section for more details.
The TinySwitch Plus incorporates auto-restart, line under-voltage
sense, and frequency jittering features. The auto-restart circuit
safely limits output power during fault conditions such as output
short or open loop. The auto-restart circuit is fully integrated and
does not require external timing components. The line under-
voltage sense threshold can be externally programmed using a line
sense resistor. During start-up, this feature keeps the TNY256 off
until the input line voltage reaches the under-voltage threshold.
When the input line voltage is removed, the line under-voltage
circuit prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by the
slow discharge of input storage capacitors present in applications
such as standby supplies. A single resistor is used to implement
this feature, eliminating what normally takes five to six components.
The line sense resistor is optional. The TNY256 operating frequency
of 130 kHz is jittered (frequency modulated) to reduce both quasi-
peak and average EMI, minimizing filtering costs.
August 1999

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TYN256P equivalent
TNY256
200
100 VDC-BUS
0
10
5 VBYPASS
0
400
200
0
0
VDRAIN
1
Time (ms)
Figure 8. TNY256 Power-up With External Resistor (2 M)
Connected to EN/UV Pin.
2
power level at the lowest input voltage, the calculated inductance
will ramp up the current to the current limit before the DCMAX
limit is reached.
Enable Function
TNY256 senses the EN/UV pin to determine whether or not to
proceed with the next switch cycle as described earlier. Once
a cycle is started, it always completes the cycle (even when the
EN/UV pin changes state half way through the cycle). This
operation results in a power supply whose output voltage ripple
is determined by the output capacitor, amount of energy per
switch cycle and the delay of the feedback.
The EN/UV pin signal is generated on the secondary by
comparing the power supply output voltage with a reference
voltage. The EN/UV pin signal is high when the power supply
output voltage is less than the reference voltage.
In a typical implementation, the EN/UV pin is driven by an
optocoupler. The collector of the optocoupler transistor is
connected to the EN/UV pin and the emitter is connected to the
SOURCE pin. The optocoupler LED is connected in series with
a Zener across the DC output voltage to be regulated. When the
output voltage exceeds the target regulation voltage level
(optocoupler diode voltage drop plus Zener voltage), the
optocoupler diode will start to conduct, pulling the EN/UV pin
low. The Zener can be replaced by a TL431 device for
improved accuracy.
The EN/UV pin pull-down current threshold is nominally
50 µA, but is set to 40 µA the instant the threshold is exceeded.
This is reset back to 50 µA when the EN/UV pull-down current
drops below the current threshold of 40 µA.
200
100 VDC-BUS
0
10
5 VBYPASS
0
400
200
0
0
VDRAIN
1
Time (ms)
2
Figure 9. TNY256 Power-up Without External Resistor Connected
to EN/UV Pin.
ON/OFF Control
The internal clock of the TNY256 runs all the time. At the
beginning of each clock cycle, it samples the EN/UV pin to
decide whether or not to implement a switch cycle. If the EN/
UV pin is high (< 40 µA), then a switching cycle takes place. If
the EN/UV pin is low (greater than 50 µA) then no switching
cycle occurs, and the EN/UV pin status is sampled again at the
start of the subsequent clock cycle.
At full load, TNY256 will conduct during the majority of its
clock cycles (Figure6). At loads less than full load, it will
skipmore cycles in order to maintain voltage regulation at the
secondary output. At light load or no load, almost all cycles will
be skipped (Figure7). A small percentage of cycles will
conduct to support the power consumption of the power supply.
The response time of the TNY256 ON/OFF control scheme is
very fast compared to normal PWM control. This provides tight
regulation and excellent transient response.
Power Up/Down
The TNY256 requires only a 0.1 µF capacitor on the BYPASS
pin. Because of the small size of this capacitor, the power-up
delay is kept to an absolute minimum, typically 0.3 ms. Due to
the fast nature of the ON/OFF feedback, there is no overshoot
at the power supply output. When an external resistor (2 M)
is connected 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 8 and 9 illustrate the
power-up timing waveform of TNY256 in applications with
and without an external resistor (2 M) connected to the
EN/UV pin.
During power-down, when an external resistor is used, the
5B
8/99


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Part NumberDescriptionMFRS
TYN256PThe function is Energy Efficient/ Low Power Off-line Switcher. Power Integrations Inc.Power Integrations  Inc.

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