TNY288KG Power Integrations, TNY288KG Datasheet - Page 5

• Manufacturer Part Number: TNY288KG
• Description: AC/DC Switching Converters 21.5 W (85-265 VAC) 28 W (230 VAC)
• Manufacturer: Power Integrations
• Type: Off-Line Switcherr

Specifications of TNY288KG

• Rohs: yes
• Output Voltage: 85 V to 265 V
• Input / Supply Voltage (max): 265 V
• Input / Supply Voltage (min): 85 V
• Supply Current: 650 uA
• Mounting Style: SMD/SMT
• Package / Case: eSOP-12B
• Number Of Outputs: 1
• Output Power: 28 W

Enable Function
TinySwitch-4 senses the ENABLE/UNDERVOLTAGE pin to
determine whether or not to proceed with the next switching
cycle. The sequence of cycles is used to determine the current
limit. Once a cycle is started, it always completes the cycle
(even when the ENABLE/UNDERVOLTAGE pin changes state
half way through the cycle). This operation results in a power
supply in which the output voltage ripple is determined by the
output capacitor, amount of energy per switch cycle and the
delay of the feedback.
Figure 7.
Figure 9.
www.powerint.com
DC
V
I
CLOCK
DRAIN
DRAIN
DC
MAX
V
I
V
CLOCK
DRAIN
EN
DRAIN
MAX
V
Operation at Near Maximum Loading.
EN
Operation at Medium Loading.
PI-2749-082305
PI-2377-082305
The ENABLE/UNDERVOLTAGE pin signal is generated on the
secondary by comparing the power supply output voltage with
a reference voltage. The ENABLE/UNDERVOLTAGE pin signal
is high when the power supply output voltage is less than the
reference voltage. In a typical implementation, the ENABLE/
UNDERVOLTAGE pin is driven by an optocoupler. The collector
of the optocoupler transistor is connected to the ENABLE/
UNDERVOLTAGE pin and the emitter is connected to the
SOURCE pin. The optocoupler LED is connected in series with
Figure 10. Operation at Very Light Load.
Figure 8.
V
DC
I
CLOCK
DRAIN
DRAIN
DC
V
MAX
I
CLOCK
DRAIN
V
DRAIN
EN
MAX
V
EN
Operation at Moderately Heavy Loading.
TNY284-290
PI-2661-082305
PI-2667-082305
Rev. A 09/12
5