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TNY379 の電気的特性と機能

TNY379のメーカーはPower Integrationsです、この部品の機能は「Off-Line Switcher」です。


製品の詳細 ( Datasheet PDF )

部品番号 TNY379
部品説明 Off-Line Switcher
メーカ Power Integrations
ロゴ Power Integrations ロゴ 




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TNY379 Datasheet, TNY379 PDF,ピン配置, 機能
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

1 Page





TNY379 pdf, ピン配列
TNY375-380
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 mA and 115 mA.
The EN/UV pin also senses line undervoltage conditions
through an external resistor connected to the DC line voltage.
If there is no external resistor connected to this pin,
TinySwitch-PK detects its absence and disables the line under-
voltage function.
SOURCE (S) Pin:
This pin is internally connected to the output MOSFET source
for high voltage power return and control circuit common.
TinySwitch-PK Functional Description
TinySwitch-PK combines a high voltage power MOSFET switch
with a power supply controller in one device. Unlike
conventional PWM (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-PK incorporates additional circuitry for
line undervoltage sense, 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
264 kHz (at the highest current limit level). 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 ±3% of the oscillator
frequency, to minimize EMI emission. The modulation rate of
600
500
VDRAIN
400
300
200
100
0
272 kHz
256 kHz
0
Figure 4. Frequency Jitter.
2.5
Time (µs)
5
the frequency 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 with an oscillator frequency of
264 kHz.
Enable Input and Current Limit State Machine
The enable input circuit at the EN/UV pin consists of a low
impedance source follower output set at 1.2 V. The current
through the source follower is limited to 115 mA. 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/UV pin voltage or current during
the remainder of the cycle are ignored. When a cycle is
disabled, the EN/UV pin is sampled at 264 kHz. This faster
sampling enables the power supply to respond faster without
being required to wait for completion of the full period.
The current limit state machine reduces the current limit by
discrete amounts at light loads when TinySwitch-PK 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 flux 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/UV 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 the TNY375 and
TNY376 to operate continuously from current taken from the
DRAIN pin. A bypass capacitor value of 0.1 mF is sufficient 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-PK
externally through a bias winding as required for TNY377-380.
Powering the TinySwitch-PK externally in this way also
decreases the no-load consumption to below 60 mW.
www.powerint.com
www.DataSheet.in

Rev. A 05/07


3Pages


TNY379 電子部品, 半導体
TNY375-380
VEN
CLOCK
DMAX
IDRAIN
VDRAIN
Figure 9. Operation at Very Light Load (fOSC 132 kHz).
PI-4541-042507
200
100
V
DC-INPUT
0
10
5
V
BYPASS
0
400
200
0
0
VDRAIN
1
Time (ms)
2
Figure 10. Power-up With Optional External UV Resistor (4 MW) Connected
to EN/UV Pin.

Rev. A 05/07
www.DataSheet.in
200
100 VDC-INPUT
0
10
5 VBYPASS
0
400
200 V
DRAIN
0
01
Time (ms)
Figure 11. Power-up Without Optional External UV Resistor Connected
to EN/UV Pin.
2
200
100
V
DC-INPUT
0
400
300
200 VDRAIN
100
0
0 .5
Time (s)
Figure 12. Normal Power-down Timing (Without UV Resistor).
1
200
100 VDC-INPUT
0
400
300
200
V
DRAIN
100
0
0 2.5 5
Time (s)
Figure 13. Slow Power-down Timing With Optional External (4 MW) UV Resistor
Connected to EN/UV Pin.
www.powerint.com

6 Page



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共有リンク

Link :


部品番号部品説明メーカ
TNY375

Off-Line Switcher

Power Integrations
Power Integrations
TNY375PN

Off-Line Switcher

Power Integrations
Power Integrations
TNY376

Off-Line Switcher

Power Integrations
Power Integrations
TNY376PN

Off-Line Switcher

Power Integrations
Power Integrations


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