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PDF TNY255G Data sheet ( Hoja de datos )
| Número de pieza | TNY255G | |
| Descripción | TinySwitch Family Energy Efficient/ Low Power Off-line Switchers | |
| Fabricantes | Power Integrations Inc. | |
| Logotipo |  |
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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
1 page  
TNY253/254/255
VEN
CLOCK
DCMAX
VIN 0 V
IDRAIN
VDRAIN
VDRAIN
0 .2
.4 .6
Time (ms)
.8
Figure 7. TinySwitch Power-Up Timing Diagram.
0V
1
Figure 6. TinySwitch Operation at Light Load.
PI-2261-061198
VIN
130 kHz Switching Frequency (TNY255)
The switching frequency (with no cycle skipping) is set at
130kHz. This allows the TNY255 to deliver 10W while still
using the same size, low cost transformer (EE16) as used by the
TNY253/254 for lower power applications.
BYPASS Pin Capacitor
The BYPASS pin uses a small 0.1 µF ceramic capacitor for
decoupling the internal power supply of the TinySwitch.
VDRAIN
12 V
12 V
0V
0V
Application Examples
Television Standby
TinySwitch is an ideal solution for low cost, high efficiency
standby power supplies used in consumer electronic products
such as TVs. Figure9 shows a 7.5 V, 1.3 W flyback circuit that
uses TNY253 for implementing a TV standby supply. The
circuit operates from the DC high voltage already available
from the main power supply. This input voltage can range from
120 to 375VDC depending on the input AC voltage range that
the TV is rated for. Capacitor C1 filters the high voltage DC
supply, and is necessary only if there is a long trace length from
the source of the DC supply to the inputs of the TV standby
circuit. The high voltage DC bus is applied to the series
combination of the primary winding of T1 and the integrated
high voltage MOSFET inside the TNY253. The low operating
frequency of the TNY253 (44kHz), allows a low cost snubber
circuit C2 and R1 to be used in place of a primary clamp circuit.
In addition to limiting the DRAIN turn off voltage spike to a
safe value, the RC snubber also reduces radiated video noise by
0 100 200 300 400
Time (ms)
Figure 8. TinySwitch Power Down Timing Diagram.
500
lowering the dv/dt of the DRAIN waveform, which is critical for
video applications such as TV and VCR. On fixed frequency
PWM and RCC circuits, use of a snubber will result in an
undesirable fixed AC switching loss that is independent of load.
The ON/OFF control on the TinySwitch eliminates this problem
by scaling the effective switching frequency and therefore,
switching loss linearly with load. Thus the efficiency of the
supply stays relatively constant down to a fraction of a watt of
output loading.
The secondary winding is rectified and filtered by D1 and C4 to
create the 7.5V output. L1 and C5 provide additional filtering.
The output voltage is determined by the sum of the optocoupler
U2 LED forward drop (~ 1 V) and Zener diode VR1 voltage.
The resistor R2, maintains a bias current through the Zener to
improve its voltage tolerance.
5C
7/01
5 Page 
TNY253/254/255
Parameter
Symbol
Conditions
SOURCE = 0 V; TJ = -40 to 125 °C
See Figure 14
(Unless Otherwise Specified)
Min
Typ
CIRCUIT PROTECTION
Current Limit
ILIMIT
Note F
Initial Current
Limit
Leading Edge
Blanking Time
Current Limit
Delay
Thermal Shutdown
Temperature
IINIT
t
LEB
tILD
di/dt = 12.5 mA/µs
TJ = 25 °C
di/dt = 25 mA/µs
TJ = 25 °C
di/dt = 80 mA/µs
T
J
=
25
°C
TNY253
TNY254
TNY255
See Figure 17
T
J
=
25
°C
TJ = 25 °C
TJ = 25 °C
See Note G
TNY253
TNY254
TNY255
TNY253
TNY254
TNY255
135
230
255
0.65 x
ILIMIT(MIN)
170
170
150
255
280
240
215
200
100
125 135
Thermal Shutdown
Hysteresis
70
OUTPUT
ON-State
Resistance
OFF-State
Leakage
Breakdown
Voltage
RDS(ON)
IDSS
BVDSS
TNY253/TNY254
I = 25 mA
D
TNY255
I = 33 mA
D
TJ = 25 °C
T
J
=
100
°C
TJ = 25 °C
TJ = 100 °C
VBP = 6.2 V, VEN = 0 V,
VDS = 560 V, TJ = 125 °C
VBP = 6.2 V, VEN = 0 V,
IDS = 100 µA, TJ = 25 °C
700
31
50
23
37
Rise Time
Fall Time
tR
Measured with Figure 10
Schematic.
tF
50
50
Max
165
280
310
250
150
145
36
60
27
45
50
Units
mA
mA
ns
ns
°C
°C
Ω
µA
V
ns
ns
11C
7/01
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet TNY255G.PDF ] | |
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