DataSheet26.com

TNY178 PDF даташит

Спецификация TNY178 изготовлена ​​​​«Power Integrations» и имеет функцию, называемую «(TNY174 - TNY180) Offline Switcher».

Детали детали

Номер произв TNY178
Описание (TNY174 - TNY180) Offline Switcher
Производители Power Integrations
логотип Power Integrations логотип 

22 Pages
scroll

No Preview Available !

TNY178 Даташит, Описание, Даташиты
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









No Preview Available !

TNY178 Даташит, Описание, Даташиты
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









No Preview Available !

TNY178 Даташит, Описание, Даташиты
a threshold current is drawn from this pin. Switching resumes
when the current being pulled from the pin drops to less than
a threshold current. A modulation of the threshold current
reduces group pulsing. The threshold current is between 75
μA and 115 μA.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source
for high voltage power return and control circuit common.
TinySwitch-LT Functional
Description
TinySwitch-LT combines a high voltage power MOSFET
switch with a power supply controller in one device. Unlike
wwwc.DoantvaeSnhteioenta4lUP.cWomM (pulse width modulator) controllers, it uses
a simple ON/OFF control to regulate the output voltage.
The controller consists of an oscillator, enable circuit (sense and
logic), current limit state machine, 5.85 V regulator, BYPASS/
MULTI-FUNCTION pin undervoltage, overvoltage circuit, and
current limit selection circuitry, over- temperature protection,
current limit circuit, leading edge blanking, and a 700 V power
MOSFET. TinySwitch-LT incorporates additional circuitry for
auto-restart, adaptive switching cycle on-time extension, and
frequency jitter. Figure 2 shows the functional block diagram
with the most important features.
Oscillator
The typical oscillator frequency is internally set to an average
of 132 kHz. Two signals are generated from the oscillator: the
maximum duty cycle signal (DCMAX) and the clock signal that
indicates the beginning of each cycle.
The oscillator incorporates circuitry that introduces a small
amount of frequency jitter, typically 8 kHz peak-to-peak, to
minimize EMI emission. The modulation rate of the frequency
600
500
VDRAIN
400
300
200
100
0
136 kHz
128 kHz
0
Figure 4. Frequency Jitter.
5
Time (μs)
10
TNY174-180
jitter is set to 1 kHz to optimize EMI reduction for both average
and quasi-peak emissions. The frequency jitter should be
measured with the oscilloscope triggered at the falling edge of
the DRAIN waveform. The waveform in Figure 4 illustrates
the frequency jitter.
Enable Input and Current Limit State Machine
The enable input circuit at the EN pin consists of a low impedance
source follower output set at 1.2 V. The current through the
source follower is limited to 115 μA. When the current out
of this pin exceeds the threshold current, a low logic level
(disable) is generated at the output of the enable circuit, until
the current out of this pin is reduced to less than the threshold
current. This enable circuit output is sampled at the beginning
of each cycle on the rising edge of the clock signal. If high, the
power MOSFET is turned on for that cycle (enabled). If low, the
power MOSFET remains off (disabled). Since the sampling is
done only at the beginning of each cycle, subsequent changes
in the EN pin voltage or current during the remainder of the
cycle are ignored.
The current limit state machine reduces the current limit by
discrete amounts at light loads when TinySwitch-LT is likely to
switch in the audible frequency range. The lower current limit
raises the effective switching frequency above the audio range
and reduces the transformer ux density, including the associated
audible noise. The state machine monitors the sequence of
enable events to determine the load condition and adjusts the
current limit level accordingly in discrete amounts.
Under most operating conditions (except when close to no-load),
the low impedance of the source follower keeps the voltage
on the EN pin from going much below 1.2 V in the disabled
state. This improves the response time of the optocoupler that
is usually connected to this pin.
5.85 V Regulator and 6.4 V Shunt Voltage Clamp
The 5.85 V regulator charges the bypass capacitor connected
to the BYPASS pin to 5.85 V by drawing a current from the
voltage on the DRAIN pin whenever the MOSFET is off. The
BYPASS/MULTI-FUNCTION pin is the internal supply voltage
node. When the MOSFET is on, the device operates from the
energy stored in the bypass capacitor. Extremely low power
consumption of the internal circuitry allows TinySwitch-LT to
operate continuously from current it takes from the DRAIN
pin. A bypass capacitor value of 0.1 μF is sufcient for both
high frequency decoupling and energy storage.
In addition, there is a 6.4 V shunt regulator clamping the
BYPASS/MULTI-FUNCTION pin at 6.4 V when current
is provided to the BYPASS/MULTI-FUNCTION pin
through an external resistor. This facilitates powering of
TinySwitch-LT externally through a bias winding to decrease
the no-load consumption to well below 50 mW.
A
08/07
3










Скачать PDF:

[ TNY178.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
TNY174(TNY174 - TNY180) Offline SwitcherPower Integrations
Power Integrations
TNY174PN(TNY174 - TNY180) Offline SwitcherPower Integrations
Power Integrations
TNY175(TNY174 - TNY180) Offline SwitcherPower Integrations
Power Integrations
TNY175PN(TNY174 - TNY180) Offline SwitcherPower Integrations
Power Integrations

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск