- 您现在的位置：买卖IC网 > PDF目录22116 > TNY278PG (Power Integrations)IC OFFLINE SWIT OVP OTP HV 8DIP PDF资料下载
参数资料
| 型号： | TNY278PG |
| 厂商： | Power Integrations |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC OFFLINE SWIT OVP OTP HV 8DIP |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 124kHz ~ 140kHz |
| 输出电压： | 700V |
| 功率（瓦特）： | 28W |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm），7 引线 |
| 供应商设备封装： | DIP-8B |
| 包装： | 管件 |
| 相关产品： | 732-2250-ND - TRANS OFF LINE POWER PI TNY278 |
| 其它名称： | 596-1318-5 |
TNY274-280
C5
2.2 nF
250 VAC
VR1
P6KE150A
NC
T1
8
D7
BYV28-200
L2
Ferrite Bead
3.5 × 7.6 mm
12 V, 1 A
85 - 265
F1
3.15 A
RV1
D1
1N4007
D2
1N4007
C1
6.8 μ F
400 V
C2
22 μ F
400 V
R1
1 k Ω
R2
100 Ω
C4
10 nF
1 kV
1
3
6
R7
4 20 Ω
C10
1000 μ F
25 V
C11
100 μ F
25 V
RTN
VAC
275 VAC
D3
1N4007
D4
1N4007
L1
1 mH
R5*
3.6 M Ω
D5
1N4007GP
VR2
1N5255B
28 V
2
5
C6
1 μ F
60 V
D6
UF4003
VR3
BZX79-C11
11 V
C7 is used to adjust U1
*R5 and R8 are optional
components
?
current limit. See circuit
D
EN/UV
R8*
21 k Ω
1%
R3
47 Ω
1/8 W
U2
PC817A
R6
390 Ω
1/8 W
description
S
BP/M
TinySwitch-III
U1
TNY278PN
S
C7 ?
100 nF
50 V
R4
2 k Ω
1/8 W
PI-4244-111708
Figure 14. TNY278P, 12 V, 1 A Universal Input Power Supply.
Applications Example
The circuit shown in Figure 14 is a low cost, high ef ?ciency,
?yback power supply designed for 12 V, 1 A output from
universal input using the TNY278.
The supply features undervoltage lockout, primary sensed
output overvoltage latching shutdown protection, high
ef ?ciency (>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 recti?ed 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 ef ?ciency. Resistor R2 allows
the use of a slow recovery, low cost, recti?er diode by limiting
the reverse current through D5. The selection of a slow diode
also improves ef ?ciency and conducted EMI but should be a
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 ef ?ciency down to very light
loads, ideal for meeting energy ef ?ciency requirements.
As the TinySwitch-III 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 con?gured, 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 (28 V+5.85 V), current begins to ?ow into the
BP/M pin. When this current exceeds I SD the internal latching
shutdown circuit in TinySwitch-III 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.
glass passivated type, with a speci?ed recovery time of ≤ 2 μ s.
For lower no-load input power consumption, the bias winding
The output voltage is regulated by the Zener diode VR3. When
the output voltage exceeds the sum of the Zener and opto-
coupler 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
8
Rev. I 01/09
may also be used to supply the TinySwitch-III device. Resistor
R8 feeds current into the BP/M pin, inhibiting the internal high
voltage current source that normally maintains the BP/M pin
capacitor voltage (C7) during the internal MOSFET off time.
This reduces the no-load consumption of this design from
140 mW to 40 mW at 265 VAC.
www.powerint.com
相关PDF资料 |
PDF描述 |
|---|---|
| TAP334K035BRS | CAP TANT 0.33UF 35V 10% RADIAL |
| RMC40DRYN | CONN EDGECARD 80POS DIP .100 SLD |
| RSC40DRYH | CONN EDGECARD 80POS DIP .100 SLD |
| GEC31DRTN | CONN EDGECARD 62POS DIP .100 SLD |
| LTC1421IG#TRPBF | IC CONTROLLER HOT SWAP 24-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TNY278PN | 功能描述:交流/直流开关转换器 21.5W 85-265 VAC 28W/230 VAC RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
| TNY278PN-TL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range |
| TNY278PTL | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range |
| TNY279G | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy Efficient, Off-Line Switcher with Enhanced Flexibility and Extended Power Range |
| TNY279GN | 功能描述:交流/直流开关转换器 25W 85-265 VAC 32W/230 VAC RoHS:否 制造商:STMicroelectronics 输出电压:800 V 输入/电源电压（最大值）:23.5 V 输入/电源电压（最小值）:11.5 V 开关频率:115 kHz 电源电流:1.6 mA 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:SSO-10 封装:Reel |
发布紧急采购，3分钟左右您将得到回复。