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Power Integrations

TNY174 Datasheet Preview

TNY174 Datasheet

(TNY174 - TNY180) Offline Switcher

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TNY174-180
TinySwitch-LT Family
Energy Efficient, Offline Switcher with Enhanced
Flexibility and Extended Power Range
Product Highlights
Lowest System Cost with Enhanced Flexibility
650 V rating optimized for non-active PFC applications
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-LT 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 heat sinking 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
Auto-restart delivers <3% of maximum power in short-circuit and
open loop fault conditions
Output overvoltage shutdown with optional Zener
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
Applications
Chargers/adapters for cell/cordless phones, PDAs, digital cameras,
MP3/portable audio, shavers, etc.
DVD/PVR and other low power set top decoders
Supplies for appliances, industrial systems, metering, etc.
Description
TinySwitch™-LT incorporates a 650 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.
AC
Input
D
TinySwitch-LT
S
EN
BP/M
Figure 1. Typical Application.
+
DC
Output
PI-4770-010709
Output Power Table
Product3
TNY174P/D4
TNY175P/D4
TNY176P/D4
TNY177P4
230 VAC ± 15%
Adapter1
Peak or
Open
Frame2
6 W 11 W
8.5 W
15 W
10 W
19 W
13 W
23.5 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
TNY177D
11.5 W
23.5 W
7W
18 W
TNY178P
16 W
28 W
10 W
21.5 W
TNY178D
TNY179P
TNY180P
14.5 W
18 W
20 W
26 W
32 W
36.5 W
9W
12 W
14 W
19.5 W
25 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 heat sink 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, D: SO-8C. See Part Ordering Information.
4. See Key Application Considerations.
www.power.com
August 2016




Power Integrations

TNY174 Datasheet Preview

TNY174 Datasheet

(TNY174 - TNY180) Offline Switcher

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TNY174-180
BYPASS/
MULTI-FUNCTION
(BP/M)
115 µA
ENABLE
ENABLE
(EN)
1.0 V + VT
1.0 V
FAULT
PRESENT
AUTO-
RESTART
COUNTER
RESET
JITTER
CLOCK
DCMAX
OSCILLATOR
OVP
LATCH
REGULATOR
5.85 V
DRAIN
(D)
+
BYPASS
CAPACITOR
SELECT AND
CURRENT
LIMIT STATE
MACHINE
5.85 V
4.9 V
-
BYPASS PIN
UNDER-VOLTAGE
VILIMIT
CURRENT LIMIT
COMPARATOR
-
+
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
Figure 2. Functional Block Diagram.
SOURCE
(S)
PI-4771-090313
Pin Functional Description
DRAIN (D) Pin:
This pin is the power MOSFET drain connection. It provides internal
operating current for both start-up 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 mF capacitor results
in the standard current limit value. Use of a 1 mF capacitor
results in the current limit being reduced to that of the next
smaller device size. Use of a 10 mF capacitor results in the
current limit being increased to that of the next larger device size
for TNY175-180.
3. It provides a shutdown function. When the current into the
bypass pin exceeds ISD, the device latches off until the
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)
EN 1
BP/M 2
D4
8S
7S
6S
D Package (SO-8C)
5S
EN 1
8S
BP/M 2
7S
6S
D4 5S
Figure 3. Pin Configuration.
PI-4772-090313
2
Rev. G 08/16
www.power.com


Part Number TNY174
Description (TNY174 - TNY180) Offline Switcher
Maker Power Integrations
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TNY174 Datasheet PDF





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