tny264 Power Integrations, Inc., tny264 Datasheet - Page 10

• Manufacturer Part Number: tny264
• Description: Enhanced, Energy Ef?cient, Low Power Off-line Switcher
• Manufacturer: Power Integrations, Inc.

*Not available.
Key Application Considerations
TinySwitch-II vs. TinySwitch
Table 2 compares the features and performance differences
between the TNY254 device of the TinySwitch family with
the TinySwitch-II family of devices. Many of the new features
eliminate the need for or reduce the cost of circuit components.
Other features simplify the design and enhance performance.
Table 2. Comparison Between TinySwitch and TinySwitch-II.
Function
Switching Frequency
and Tolerance
Temperature Variation
(0-100 °C)**
Active Frequency Jitter
Transformer Audible
Noise Reduction
Line UV Detect
Current Limit Tolerance
Temperature Variation
(0-100 °C)**
Auto-Restart
BYPASS Pin Zener
Clamp
DRAIN Creepage at
Package
10
TNY263-268
G
4/05
** See typical performance curves.
44 kHz ±10% (at 25 °C)
+8%
N/A*
N/A*
N/A*
±11% (at 25 °C)
-8%
N/A*
N/A*
0.037 in. / 0.94 mm
TinySwitch
TNY254
132 kHz ±6% (at 25 °C)
+2%
±4 kHz
Yes–built into controller
Single resistor
programmable
±7% (at 25 °C)
0%
6% effective on-time
Internally clamped to
6.3 V
0.137 in. / 3.48 mm
TinySwitch-II
TNY263-268
Design
Output Power
Table 1 (front page) shows the practical continuous output power
levels that can be obtained under the following conditions:
1. The minimum DC input voltage is 90 V or higher for
85 VAC input, or 240 V or higher for 230 VAC input or
115 VAC input with a voltage doubler. This corresponds to
a filter capacitor of 3 µF/W for universal input and 1 µF/W
for 230 VAC or 115 VAC with doubler input.
• Smaller transformer for low cost
• Ease of design
• Manufacturability
• Optimum design for lower cost
• Lower EMI minimizing filter
• Practically eliminates audible
• Prevents power on/off glitches
• Increases power capability and
• Limits output short-circuit current
• Protects load in open loop fault
• Allows TinySwitch-II to be
• Greater immunity to arcing as a
component costs
noise with ordinary dip varnished
transformer – no special
construction or gluing required
simplifies design for high volume
manufacturing
to less than full load current
- No output diode size penalty
conditions
- No additional components
powered from a low voltage bias
winding to improve efficiency and
to reduce on-chip power
dissipation
result of dust, debris or other
contaminants build-up
required
TinySwitch-II
Advantages