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TNY277PG Datasheet(PDF) 5 Page - Power Integrations, Inc.

Part # TNY277PG
Description  Energy-Effi cient, Off-Line Switcher With Enhanced Flexibility and Extended Power Range
Download  24 Pages
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Manufacturer  POWERINT [Power Integrations, Inc.]
Direct Link  http://www.powerint.com
Logo POWERINT - Power Integrations, Inc.

TNY277PG Datasheet(HTML) 5 Page - Power Integrations, Inc.

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Rev. I 01/09
5
TNY274-280
www.powerint.com
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 diode across the DC output voltage to be regulated.
When the output voltage exceeds the target regulation voltage
level (optocoupler LED voltage drop plus Zener voltage), the
optocoupler LED will start to conduct, pulling the EN/UV pin
low. The Zener diode can be replaced by a TL431 reference
circuit for improved accuracy.
ON/OFF Operation with Current Limit State Machine
The internal clock of the TinySwitch-III 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, and based
on the sequence of samples over multiple cycles, it determines
the appropriate current limit. At high loads, the state machine
sets the current limit to its highest value. At lighter loads, the
state machine sets the current limit to reduced values.
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
PI-2749-082305
Figure 6.
Operation at Near Maximum Loading.
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
PI-2667-082305
Figure 7.
Operation at Moderately Heavy Loading.
Figure 8.
Operation at Medium Loading.
PI-2377-082305
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
PI-2661-082305
V
DRAIN
V
EN
CLOCK
DC
DRAIN
I
MAX
Figure 9.
Operation at Very Light Load.


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