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Power Integrations

TNY254GN Datasheet Preview

TNY254GN Datasheet

Low Power Off-line Switcher

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TNY253/254/255
TinySwitchFamily
Energy Efficient, Low Power Off-line Switchers
Product Highlights
Lowest Cost, Low Power Switcher Solution
• Lower cost than RCC, discrete PWM and other integrat-
ed/hybrid solutions
• Cost effective replacement for bulky linear adapters
• Lowest component count
• Simple ON/OFF control – no loop compensation devices
• No bias winding – simpler, lower cost transformer
• Allows simple RC type EMI filter for up to 2 W from
universal input or 4 W from 115 VAC input
Extremely Energy Efficient
• Consumes only 30/60 mW at 115/230 VAC with no load
• Meets Blue Angel, Energy Star, Energy 2000 and 200 mW
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, standby power supplies for
PC, TV and VCR, utility meters, and cordless phones.
High Performance at Low Cost
• High-voltage powered – ideal for charger applications
• Very high loop bandwidth provides excellent transient
response and fast turn on with practically no overshoot
• Current limit operation rejects line frequency ripple
• Glitch free output when input is removed
• Built-in current limit and thermal protection
• 44 kHz operation (TNY253/4) with snubber clamp
reduces EMI and video noise in TVs and VCRs
• Operates with optocoupler or bias winding feedback
Description
The TinySwitch family uses a breakthrough design to provide
the lowest cost, high efficiency, off-line switcher solution in
the 0 to 10 W range. These devices integrate a 700 V power
MOSFET, oscillator, high-voltage switched current source,
current limit and thermal shutdown circuitry. They start-up
and run on power derived from the DRAIN voltage, eliminat-
ing the need for a transformer bias winding and the associated
circuitry. And yet, they consume only about 80 mW at no load,
from 265 VAC input. A simple ON/OFF control scheme also
eliminates the need for loop compensation.
+
Wide-Range
High-Voltage
DC Input
TinySwitch
D
EN
BP
S
Figure 1. Typical Standby Application.
+
DC
Output
PI-2178-022699
TinySwitch Selection Guide
ORDER
PART
NUMBER
TNY253P
TNY253G
TNY254P
TNY254G
TNY255P
TNY255G
PACKAGE
DIP-8
SMD-8
DIP-8
SMD-8
DIP-8
SMD-8
Recommended Range
for Lowest System Cost*
230 VAC or
115 VAC
w/Doubler
85-265
VAC
0-4 W
0-2 W
2-5 W
1-4 W
4-10 W 3.5-6.5 W
Table 1. *Please refer to the Key Application Considerations section
for details.
The TNY253 and TNY254 switch at 44 kHz to minimize EMI
and to allow a simple snubber clamp to limit DRAIN spike
voltage. At the same time, they allow use of low cost EE16 core
transformers to deliver up to 5 W. The TNY253 is identical to
TNY254 except for its lower current limit, which reduces output
short-circuit current for applications under 2.5 W. TNY255
uses higher switching rate of 130 kHz to deliver up to 10 W
from the same low cost EE16 core for applications such as PC
standby supply. An EE13 or EF13 core with safety spaced
bobbin can be used for applications under 2.5 W. Absence of
a bias winding eliminates the need for taping/margins in most
applications, when triple insulated wire is used for the secondary.
This simplifies the transformer construction and reduces cost.
February 2012




Power Integrations

TNY254GN Datasheet Preview

TNY254GN Datasheet

Low Power Off-line Switcher

No Preview Available !

TNY253/254/255
BYPASS
50 μA
OSCILLATOR
CLOCK
DCMAX
REGULATOR
5.8 V
5.8 V
5.1 V
UNDERVOLTAGE
+
-
THERMAL
SHUTDOWN
DRAIN
VILIMIT
S
Q
ENABLE
1.5 V + VTH
R
Q
LEADING
EDGE
BLANKING
SOURCE
Figure 2. Functional Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
Power MOSFET drain connection. Provides internal operating
current for both start-up and steady-state operation.
BYPASS (BP) Pin:
Connection point for an external bypass capacitor for the inter-
nally generated 5.8 V supply. Bypass pin is not intended for
sourcing supply current to external circuitry.
ENABLE (EN) Pin:
The power MOSFET switching can be terminated by pulling
this pin low. The I-V characteristic of this pin is equivalent to
a voltage source of approximately 1.5 V with a source current
clamp of 50 µA.
SOURCE (S) Pin:
Power MOSFET source connection. Primary return.
TinySwitch Functional Description
TinySwitch is intended for low power off-line applications. It
combines a high-voltage power MOSFET switch with a power
supply controller in one device. Unlike a conventional PWM
(Pulse Width Modulator) controller, the TinySwitch uses a
simple ON/OFF control to regulate the output voltage.
The TinySwitch controller consists of an Oscillator, Enable
(Sense and Logic) circuit, 5.8 V Regulator, Undervoltage circuit,
PI-2197-061898
BYPASS 1
8 SOURCE
SOURCE 2
7 SOURCE
SOURCE 3
6 SOURCE
ENABLE 4
5 DRAIN
P Package (DIP-8)
G Package (SMD-8)
PI-2199-031501
Figure 3. Pin Configuration.
Hysteretic Over Temperature Protection, Current Limit circuit,
Leading Edge Blanking, and a 700 V power MOSFET. Figure
2 shows a functional block diagram with the most important
features.
Oscillator
The oscillator frequency is internally set at 44 kHz (130 kHz
for the TNY255). The two signals of interest are the Maxi-
mum Duty Cycle signal (DMAX) which runs at typically 67%
duty cycle and the Clock signal that indicates the beginning of
each cycle. When cycles are skipped (see below), the oscilla-
tor frequency doubles (except for TNY255 which remains at
130 kHz). This increases the sampling rate at the ENABLE
pin for faster loop response.
Enable (Sense and Logic)
The ENABLE pin circuit has a source follower input stage set
at 1.5 V. The input current is clamped by a current source set
at 50 µA with 10 µA hysteresis. The output of the enable sense
2
Rev E
02/12


Part Number TNY254GN
Description Low Power Off-line Switcher
Maker Power Integrations
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TNY254GN Datasheet PDF






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