Offline Switcher. TNY175 Datasheet

TNY175 Datasheet PDF, Equivalent


Part Number

TNY175

Description

(TNY174 - TNY180) Offline Switcher

Manufacture

Power Integrations

Total Page 22 Pages
PDF Download
Download TNY175 Datasheet PDF


TNY175 Datasheet
TNY174-180
TinySwitch®-LT Family
Energy Efcient, Ofine 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
www.DataShfreaemt4eUa.cpopmlications, maximum continuous power
- Lower current limit improves efciency 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 lter costs
• Pin-out simplies 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
• 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 eld reliability
EcoSmart®– Extremely Energy Efcient
• Easily meets all global energy efciency regulations
• No-load <150 mW at 265 VAC without bias winding,
<50 mW with bias winding
• ON/OFF control provides constant efciency 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.
AC
Input
D
EN
BP/M
TinySwitch-LT
S
Figure 1. Typical Application.
+
DC
Output
-
PI-4770-073107
OUTPUT POWER TABLE
230 VAC ±15% 85-265 VAC
PRODUCT3
Peak or
Peak or
Adapter1 Open Adapter1 Open
Frame2
Frame2
TNY174PN 6 W 11 W 5 W 8.5 W
TNY175PN 8.5 W 15 W 6 W 11.5 W
TNY176PN 10 W 19 W 7 W 15 W
TNY177PN 13 W 23.5 W 8 W 18 W
TNY178PN 16 W 28 W 10 W 21.5 W
TNY179PN 18 W 32 W 12 W 25 W
TNY180PN 20 W 36.5 W 14 W 28.5 W
Table 1. 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 Application Considerations). 3. Packages:
P: DIP-8C, G: SMD-8C. See Part Ordering Information.
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 exible solution
with a low system cost and extended power capability.
August 2007

TNY175 Datasheet
TNY174-180
BYPASS/
MULTI-FUNCTION
(BP/M)
115 μA
ENABLE
www.DataSheet4U.com
1.0 V + VT
ENABLE
(EN)
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
5.85 V
4.9 V
-
LIMIT STATE
MACHINE
BYPASS PIN
UNDER-VOLTAGE
VILIMIT
CURRENT LIMIT
COMPARATOR
-
+
THERMAL
SHUTDOWN
SQ
RQ
LEADING
EDGE
BLANKING
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 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
2A
08/07
SOURCE
(S)
PI-4771-073107
P Package (DIP-8C)
EN 1
BP/M 2
D4
8S
7S
6S
5S
Figure 3. Pin Conguration.
PI-4772-07307
with a Zener connected from the BP/M pin to a bias winding
supply.
ENABLE (EN) Pin:
The switching of the power MOSFET is controlled by this pin.
MOSFET switching is terminated when a current greater than


Features Datasheet pdf TNY174-180 ® TinySwitch-LT Family Ener gy Efficient, Offline Switcher with E nhanced Flexibility and Extended Power Range Product Highlights Lowest System Cost with Enhanced Flexibility • 650 V rating optimized for non-active PFC a pplications • Simple ON/OFF control, no loop compensation needed • Selecta ble current limit through BP/M capacito r value - Higher current limit extends peak power or, in open frame applicatio ns, maximum continuous power www.DataSh eet4U.com - Lower current limit improve s efficiency in enclosed adapters/char gers - Allows optimum TinySwitch-LT cho ice by swapping devices with no other c ircuit redesign • Tight I2f parameter tolerance reduces system cost - Maximi zes MOSFET and magnetics power delivery - Minimizes max overload power, reduci ng cost of transformer, primary clamp & secondary components • ON-time exten sion – extends low line regulation ra nge/ hold-up time to reduce input bulk capacitance • Self-biased: no bias winding or bias components • Frequency jitterin.
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