Off-Line Switcher. TNY278 Datasheet

TNY278 Datasheet PDF, Equivalent


Part Number

TNY278

Description

(TNY274 - TNY280) Energy Efficient / Off-Line Switcher

Manufacture

Power Integrations

Total Page 24 Pages
PDF Download
Download TNY278 Datasheet PDF


TNY278 Datasheet
TNY274-280
TinySwitch®-III Family
Energy-Efficient, Off-Line Switcher With
Enhanced Flexibility and Extended Power Range
Product Highlights
Lowest System Cost with Enhanced Flexibility
Simple ON/OFF control, no loop compensation needed
Selectable current limit through BP/M capacitor value
Higher current limit extends peak power or, in open
frame applications, maximum continuous power
Lower current limit improves efficiency in enclosed
adapters/chargers
Allows optimum TinySwitch-III choice by swapping
devices with no other circuit redesign
Tight I2f parameter tolerance reduces system cost
Maximizes MOSFET and magnetics power delivery
Minimizes max overload power, reducing cost of
transformer, primary clamp & secondary components
ON-time extension – extends low line regulation range/hold-up
time to reduce input bulk capacitance
Self-biased: no bias winding or bias components
Frequency jittering reduces EMI filter costs
Pin-out simplifies heatsinking to the PCB
SOURCE pins are electrically quiet for low EMI
Enhanced Safety and Reliability Features
Accurate hysteretic thermal shutdown protection with
automatic recovery eliminates need for manual reset
Improved auto-restart delivers <3% of maximum power in short
circuit and open loop fault conditions
Output overvoltage shutdown with optional Zener
Line undervoltage detect threshold set using a single optional
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 <150 mW at 265 VAC without bias winding, <50 mW
with bias winding
ON/OFF control provides constant efficiency down to very light
loads – ideal for mandatory CEC regulations and 1 W PC
standby requirements
Applications
Chargers/adapters for cell/cordless phones, PDAs, digital
cameras, MP3/portable audio, shavers, etc.
PC Standby and other auxiliary supplies
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc.
+
Wide-Range
HV DC Input
D
EN/UV
TinySwitch-III
BP/M
S
-
Figure 1. Typical Standby Application.
+
DC
Output
-
PI-4095-082205
Output Power Table
230 VAC ± 15%
Product3
Adapter1
Peak or
Open
Frame2
TNY274P/G 6 W 11 W
TNY275P/G
8.5 W
15 W
TNY276P/G
10 W
19 W
TNY277P/G
13 W
23.5 W
TNY278P/G
16 W
28 W
TNY279P/G
18 W
32 W
TNY280P/G
20 W
36.5 W
85-265 VAC
Adapter1
Peak or
Open
Frame2
5 W 8.5 W
6 W 11.5 W
7 W 15 W
8 W 18 W
10 W
21.5 W
12 W
25 W
14 W
28.5 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 peak power capability in any design or minimum continuous power in
an open frame design (see Key Applications Considerations).
3. Packages: P: DIP-8C, G: SMD-8C. See Part Ordering Information.
Description
TinySwitch-III incorporates a 700 V power MOSFET, oscillator,
high voltage switched current source, current limit (user
selectable) and thermal shutdown circuitry. The IC family uses an
ON/OFF control scheme and offers a design flexible solution with
a low system cost and extended power capability.
www.powerint.com
January 2009

TNY278 Datasheet
TNY274-280
BYPASS/
MULTI-FUNCTION
(BP/M)
115 μA
25 μA
LINE UNDER-VOLTAGE
FAULT
PRESENT
AUTO-
RESTART
COUNTER
6.4 V
RESET
ENABLE
1.0 V + VT
ENABLE/
UNDER-
VOLTAGE
(EN/UV)
1.0 V
JITTER
CLOCK
DCMAX
OSCILLATOR
OVP
LATCH
REGULATOR
5.85 V
DRAIN
(D)
+
BYPASS
CAPACITOR
SELECT AND
CURRENT
5.85 V
4.9 V
-
LIMIT STATE
MACHINE
BYPASS PIN
UNDER-VOLTAGE
VILIMIT
CURRENT LIMIT
COMPARATOR
-
+
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
SOURCE
(S)
PI-4077-062306
Figure 2. Functional Block Diagram.
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides
internal operating current for both startup and steady-state
operation.
BYPASS/MULTI-FUNCTION (BP/M) Pin:
This pin has multiple functions:
1. It is the connection point for an external bypass capacitor for
the internally generated 5.85 V supply.
2. It is a mode selector for the current limit value, depending on
the value of the capacitance added. Use of a 0.1 μF
capacitor results in the standard current limit value. Use of a
1 μF capacitor results in the current limit being reduced to
that of the next smaller device size. Use of a 10 μF capacitor
results in the current limit being increased to that of the next
larger device size for TNY275-280.
3. It provides a shutdown function. When the current into the
bypass pin exceeds I , the device latches off until the
SD
BP/M voltage drops below 4.9 V, during a power down. This
can be used to provide an output overvoltage function with a
Zener connected from the BP/M pin to a bias winding supply.
P Package (DIP-8C)
G Package (SMD-8C)
EN/UV 1
BP/M 2
D4
8S
7S
6S
5S
PI-4078-080905
Figure 3. Pin Configuration.
ENABLE/UNDERVOLTAGE (EN/UV) Pin:
This pin has dual functions: enable input and line undervoltage
sense. During normal operation, switching of the power
MOSFET is controlled by this pin. MOSFET switching is
terminated when a current greater than a threshold current is
drawn from this pin. Switching resumes when the current being
2
Rev. I 01/09
www.powerint.com


Features Datasheet pdf www.DataSheet4U.com TNY274-280 ® Tiny Switch-III Family Product Highlights E nergy Efficient, Off-Line Switcher wit h Enhanced Flexibility and Extended Pow er Range + + DC Lowest System Cost wit h Enhanced Flexibility Output • Simpl e ON/OFF control, no loop compensation needed • Selectable current limit thr ough BP/M capacitor value Wide-Range D - Higher current limit extends peak pow er or, in open HV DC Input EN/UV frame applications, maximum continuous power BP/M TinySwitch-III - Lower current lim it improves efficiency in enclosed S a dapters/chargers - Allows optimum TinyS witch-III choice by swapping PI-4095-08 2205 devices with no other circuit rede sign • Tight I2f parameter tolerance reduces system cost Figure 1. Typical S tandby Application. - Maximizes MOSFET and magnetics power delivery - Minimize s max overload power, reducing cost of OUTPUT POWER TABLE transformer, primary clamp & secondary components • ON-ti me extension – extends low line regulation range/ 230 VAC ±15% 85-265 VAC ho.
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