Off-line Switchers. TNY254G Datasheet

TNY254G Datasheet PDF, Equivalent


Part Number

TNY254G

Description

TinySwitch Family Energy Efficient/ Low Power Off-line Switchers

Manufacture

Power Integrations Inc.

Total Page 20 Pages
PDF Download
Download TNY254G Datasheet PDF


TNY254G Datasheet
TNY253/254/255
TinySwitch® Family
Energy Efficient, Low Power Off-line Switchers
®
Product Highlights
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 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
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, 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 & 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, eliminating the
need for a transformer bias winding and the associated circuitry.
And yet, they consume only about 80 mW at no load, from
265VAC input. A simple ON/OFF control scheme also
eliminates the need for loop compensation.
The TNY253 and TNY254 switch at 44 kHz to minimize EMI
and to allow a simple snubber clamp to limit DRAIN spike
+
Wide-Range
HV 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.
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 2.5W.
TNY255 uses higher switching rate of 130kHz 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 2.5W.
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.
July 2001

TNY254G Datasheet
TNY253/254/255
BYPASS
50 µA
OSCILLATOR
CLOCK
DCMAX
REGULATOR
5.8 V
5.8 V
5.1 V
UNDER-VOLTAGE
+
-
THERMAL
SHUTDOWN
DRAIN
+
- VILIMIT
SQ
ENABLE
1.5 V + VTH
RQ
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
internally generated 5.8V 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 1.5V 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, 5.8V Regulator, Under-Voltage
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)
Figure 3. Pin Configuration.
PI-2199-031501
circuit, Hysteretic Over Temperature Protection, Current Limit
circuit, Leading Edge Blanking, and a 700V 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 Maximum
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 oscillator
frequency doubles (except for TNY255 which remains at
130kHz). 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 1.5V. The input current is clamped by a current source set
at 50 µA with 10 µA hysteresis. The output of the enable sense
2C
7/01


Features Datasheet pdf ® TNY253/254/255 TinySwitch Family Ene rgy Efficient, Low Power Off-line Switc hers Product Highlights Lowest Cost, Lo w Power Switcher Solution • Lower cos t than RCC, discrete PWM and other inte grated/hybrid solutions • Cost effect ive replacement for bulky linear adapte rs • Lowest component count • Simpl e ON/OFF control – no loop compensati on devices • No bias winding – simp ler, lower cost transformer • Allows simple RC type EMI filter for up to 2 W from universal input or 4 W from 115 V AC input Extremely Energy Efficient • Consumes only 30/60 mW at 115/230 VAC with no load • Meets Blue Angel, Ener gy Star, Energy 2000 and 200mW European cell phone requirements for standby Saves $1 to $4 per year in energy cos ts (at $0.12/kWHr) compared to bulky li near adapters • Ideal for cellular ph one chargers, standby power supplies fo r PC, TV and VCR, utility meters, and c ordless phones. High Performance at Low Cost • High voltage powered – ideal for charger applications • Very high loop bandwidth.
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