TNY378 Datasheet PDF - Power Integrations
| Part Number | TNY378 | |
| Description | Off-Line Switcher | |
| Manufacturers | Power Integrations | |
| Logo |  |
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TNY375-380
TinySwitch®-PK Family
Energy-Efficient, Off-Line Switcher With
Enhanced Peak Power Performance
Product Highlights
Lowest System Cost with Enhanced Flexibility
• Simple ON/OFF control, no loop compensation needed
• Unique Peak Mode feature extends power range without
increasing transformer size
• Maximum frequency and current limit boosted at peak loads
• Selectable current limit through BP/M capacitor value
• Higher current limit extends maximum power in open frame
• Lower current limit improves efficiency in enclosed adapters
• Allows optimum TinySwitch-PK choice by swapping devices
with no other circuit redesign
• Tight I2f parameter tolerance reduces system cost
• Maximizes MOSFET and magnetics power delivery
• ON time extension – typically extends low line regulation range/
hold-up time to reduce input bulk capacitance
• Self-biased: no bias winding required for TNY375-376; winding
required for TNY377-380
• Frequency jittering reduces EMI filter costs
• Optimized pin out eases pcb/external heatsinking
• Quiet source-connected heatsink pins for low EMI
Enhanced Safety and Reliability Features
• Accurate hysteretic thermal shutdown with automatic recovery
provides complete system level overload protection and
eliminates need for manual reset
• Auto-restart delivers <3% maximum power in short circuit and
open loop fault conditions
• Output overvoltage shutdown with optional Zener
• Line undervoltage detect threshold set using a single resistor
• Very low component count enhances reliability and enables
single sided printed circuit board layout
• High bandwidth provides fast turn on with no overshoot and
excellent transient load response
• Extended creepage between DRAIN and all other pins improves
field reliability
EcoSmart®– Extremely Energy Efficient
• Easily meets all global energy efficiency regulations
• No-load <170 mW at 265 VAC without bias winding, <60 mW
with bias winding
• ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC efficiency regulations and 1 W
PC standby requirements
Applications
• Applications with high peak-to-continuous power demands –
DVDs, PVRs, active speakers (e.g. PC audio), audio amplifiers,
modems, photo printers
• Applications with high power demands at startup (large output
capacitance or motor loads) - PC standby, low voltage motor
drives
AC +
IN DC
OUT
D
TinySwitch-PK
S
EN/UV
BP/M
Figure 1. Typical Peak Power Application.
PI-4266-010906
Output Power Table
Product3
230 VAC ± 15%
Adapter1
Open
Frame2
Peak
85-265 VAC
Adapter1
Open
Frame2
Peak
TNY375PN
TNY376PN
TNY377PN
TNY378PN
TNY379PN
8.5 W
10 W
13 W
16 W
18 W
15 W
19 W
23.5 W
28 W
32 W
16.5 W
22 W
28 W
34 W
39 W
6W
7W
8W
10 W
12 W
11.5 W
15 W
18 W
21.5 W
25 W
12.5 W
17 W
23 W
27 W
31 W
TNY380PN 20 W 36.5 W 45 W 14 W 28.5 W 35 W
Table 1. Output Power Table.
Notes:
1. Minimum continuous power in a typical non-ventilated enclosed adapter
measured at +50 °C ambient. Use of an external heatsink will increase power
capability.
2. Minimum continuous power in an open frame design (see Key Applications
Considerations).
3. Packages: P: DIP-8C. Lead free only. See Part Ordering Information.
Description
TinySwitch-PK incorporates a 700 V MOSFET, oscillator, high-
voltage switched current source, current limit (user selectable),
and thermal shutdown circuitry. A unique peak mode feature
boosts current limit and frequency for peak load conditions. The
boosted current limit provides the peak output power while the
increased peak mode frequency ensures the transformer can be
sized for continuous load conditions rather than peak power
demands.
www.powerint.com
May 2007
www.DataSheet.in
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TNY375-380
VEN
CLOCK
DCMAX
IDRAIN
VDRAIN
PI-2749-082305
Figure 6. Operation at Near Maximum Loading (fOSC 264 kHz).
VEN
CLOCK
DCMAX
The EN/UV pin signal is generated on the secondary by
comparing the power supply output voltage with a reference
voltage. The EN/UV pin signal is high when the power supply
output voltage is less than the reference voltage.
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-PK runs at all times. 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. With TinySwitch-PK,
when the state machine sets the current limit to its highest
value, the oscillator frequency is also doubled, providing the
unique peak mode operation. At lighter loads, the state
machine sets the current limit to reduced values. At these lower
current limit levels, the oscillator frequency returns to the
standard value.
At near maximum load, TinySwitch-PK will conduct during
nearly all of its clock cycles (Figure 6). At slightly lower load, it
will “skip” additional cycles in order to maintain voltage
regulation at the power supply output (Figure 7). At medium
loads, more cycles will be skipped, the current limit will be
IDRAIN
VDRAIN
VEN
CLOCK
DCMAX
PI-2667-082305
Figure 7. Operation at Moderately Heavy Loading (fOSC 264 kHz).
Enable Function
TinySwitch-PK senses the EN/UV 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 EN/UV
pin changes state halfway 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.
IDRAIN
VDRAIN
Figure 8. Operation at Medium Loading (fOSC 132 kHz).
PI-4540-050407
www.powerint.com
www.DataSheet.in
Rev. A 05/07
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for TNY378 electronic component. |
| Information | Total 20 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ TNY378.PDF Datasheet ] | |
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