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TNY180 PDF 데이터시트 ( Data , Function )

부품번호 TNY180 기능
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TNY180 데이터시트, 핀배열, 회로
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




TNY180 pdf, 반도체, 판매, 대치품
TNY174-180
BYPASS/MULTI-FUNCTION Pin Undervoltage
The BYPASS/MULTI-FUNCTION pin undervoltage circuitry
disables the power MOSFET when the BYPASS/MULTI-
FUNCTION pin voltage drops below 4.9 V in steady state
operation. Once the BYPASS/MULTI-FUNCTION pin voltage
drops below 4.9 V in steady state operation, it must rise back
to 5.85 V to enable (turn-on) the power MOSFET.
Over Temperature Protection
The thermal shutdown circuitry senses the die temperature. The
threshold is typically set at 142 °C with 75 °C hysteresis. When
the die temperature rises above this threshold the power MOSFET
is disabled and remains disabled until the die temperature falls
by 75 °C, at which point it is re-enabled. A large hysteresis of
75 °C (typical) is provided to prevent overheating of the PC
wwwb.DoaatradSdhueeett4oUa.ccoomntinuous fault condition.
Current Limit
The current limit circuit senses the current in the power MOSFET.
When this current exceeds the internal threshold (ILIMIT), the
power MOSFETis turned off for the remainder of that cycle.The
current limit state machine reduces the current limit threshold
by discrete amounts under medium and light loads.
The leading edge blanking circuit inhibits the current limit
comparator for a short time (tLEB) after the power MOSFET is
turned on. This leading edge blanking time has been set so that
current spikes caused by capacitance and secondary-side rectier
reverse recovery time will not cause premature termination of
the switching pulse.
Auto-Restart
In the event of a fault condition such as output overload, output
short circuit, or an open loop condition, TinySwitch-LT enters
into auto-restart operation. An internal counter clocked by the
oscillator is reset every time the EN pin is pulled low. If the EN
pin is not pulled low for 64 ms, the power MOSFET switching
300
V
DRAIN
200
100
0
10
V
5 DC-OUTPUT
0
0 2500
Time (ms)
Figure 5. Auto-Restart Operation.
4A
08/07
5000
is normally disabled for 2.5 seconds. The auto-restart alternately
enables and disables the switching of the power MOSFET until
the fault condition is removed. Figure 5 illustrates auto-restart
circuit operation in the presence of an output short circuit.
Adaptive Switching Cycle On-Time Extension
Adaptive switching cycle on-time extension keeps the cycle
on until current limit is reached, instead of prematurely
terminating after the DCMAX signal goes low. This feature
reduces the minimum input voltage required to maintain
regulation, extending hold-up time and minimizing the size
of bulk capacitor required. The on-time extension is disabled
during the startup of the power supply, until the power supply
output reaches regulation.
TinySwitch-LT Operation
TinySwitch-LT devices operate in the current limit mode. When
enabled, the oscillator turns the power MOSFET on at the
beginning of each cycle. The MOSFET is turned off when the
current ramps up to the current limit or when the DCMAX limit is
reached. Since the highest current limit level and frequency of
a TinySwitch-LT design are constant, the power delivered to the
load is proportional to the primary inductance of the transformer
and peak primary current squared. Hence, designing the supply
involves calculating the primary inductance of the transformer
for the maximum output power required. If the TinySwitch-LT
is appropriately chosen for the power level, the current in the
calculated inductance will ramp up to current limit before the
DCMAX limit is reached.
Enable Function
TinySwitch-LT senses the EN pin to determine whether or not to
proceed with the next switching cycle. The sequence of cycles
is used to determine the current limit. Once a cycle is started,
it always completes the cycle (even when the EN pin changes
state half way through the cycle). This operation results in a
power supply in which the output voltage ripple is determined
by the output capacitor, amount of energy per switch cycle and
the delay of the feedback.
The EN pin signal is generated on the secondary by comparing
the power supply output voltage with a reference voltage. The
EN pin signal is high when the power supply output voltage is
less than the reference voltage.
In a typical implementation, the EN pin is driven by an
optocoupler. The collector of the optocoupler transistor is
connected to the EN pin and the emitter is connected to the
SOURCE pin. The optocoupler LED is connected in series with
a Zener diode across the DC output voltage to be regulated.
When the output voltage exceeds the target regulation voltage
level (optocoupler LED voltage drop plus Zener voltage), the
optocoupler LED will start to conduct, pulling the EN pin low.
The Zener diode can be replaced by a TL431 reference circuit

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TNY180 전자부품, 판매, 대치품
TNY174-180
D1
1N4007
F1
J1 3.15 A
85-265 RV1
VAC 275 VAC
J2
D3
1N4007
D2
1N4007
C1
6.8 μF
400 V
D4
1N4007
L1
1 mH
www.DataSheet4U.com *R5 is optional
C7 is configurable to adjust
U1 current limit, see circuit
description
VR1
P6KE150A
C2
22 μF
400 V
R1
1 kΩ
R2
100 Ω
C4
10 nF
1 kV
C5
2.2 nF
250 VAC
NC T1 8
D7
BYV28-200
16
3 R7
4 20 Ω
L2
Ferrite Bead
3.5 × 7.6 mm
+12 V, 1 A
C10
1000 μF
25 V
C11 J3
100 μF
25 V J4
RTN
D5
1N4007GP
VR2
1N5255B
28 V
D
EN
S BP/M
S
TinySwitch-LT C7
U1 100 nF
TNY178P
50 V
R8*
21 kΩ
1%
2
5
R3
47 Ω
1/8 W
D6
UF4003
C6
1 μF
60 V
VR3
BZX79-C11
11 V
U2
PC817A
R6
390 Ω
1/8 W
R4
2 kΩ
1/8 W
PI-4773-073107
Figure 12. TNY178P, 12 V, 1 A Universal Input Power Supply.
Applications Example
The circuit shown in Figure 12 is a low cost, high efciency,
yback power supply designed for 12 V, 1 A output from
universal input using the TNY178.
The supply features primary sensed output overvoltage latching
shutdown protection, high efciency (>80%), and very low no-
load consumption (<50 mW at 265 VAC). Output regulation is
accomplished using a simple zener reference and optocoupler
feedback.
The rectied and ltered input voltage is applied to the primary
winding of T1. The other side of the transformer primary is
driven by the integrated MOSFET in U1. Diode D5, C2, R1,
R2, and VR1 comprise the clamp circuit, limiting the leakage
inductance turn-off voltage spike on the DRAIN pin to a safe
value. The use of a combination a Zener clamp and parallel
RC optimizes both EMI and energy efciency. Resistor R2
allows the use of a slow recovery, low cost, rectier diode by
limiting the reverse current through D5. The selection of a
slow diode also improves efciency and conducted EMI but
should be a glass passivated type, with a specied recovery
time of 2 μs.
The output voltage is regulated by the Zener diode VR3. When
the output voltage exceeds the sum of the Zener and optocoupler
LED forward drop, current will ow in the optocoupler LED.
This will cause the transistor of the optocoupler to sink current.
When this current exceeds the ENABLE pin threshold current
the next switching cycle is inhibited. When the output voltage
falls below the feedback threshold, a conduction cycle is allowed
to occur and, by adjusting the number of enabled cycles, output
regulation is maintained. As the load reduces, the number of
enabled cycles decreases, lowering the effective switching
frequency and scaling switching losses with load. This provides
almost constant efciency down to very light loads, ideal for
meeting energy efciency requirements.
As the TinySwitch-LT devices are completely self-powered,
there is no requirement for an auxiliary or bias winding on the
transformer. However by adding a bias winding, the output
overvoltage protection feature can be congured, protecting
the load against open feedback loop faults.
When an overvoltage condition occurs, such that bias voltage
exceeds the sum of VR2 and the BYPASS/MULTIFUNCTION
(BP/M) pin voltage (28V+5.85V), current begins to ow into the
BP/M pin. When this current exceeds ISD the internal latching
shutdown circuit in TinySwitch-LT is activated. This condition
is reset when the BP/M pin voltage drops below 2.6 V after
removal of the AC input. In the example shown, on opening
the loop, the OVP trips at an output of 17 V.
A
08/07
7

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