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参数资料
| 型号： | TNY377P |
| 厂商： | POWER INTEGRATIONS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.4 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PDIP7 |
| 封装： | PLASTIC, MS-001AB, DIP-8/7 |
| 文件页数： | 19/20页 |
| 文件大小： | 1076K |
| 代理商： | TNY377P |
Rev. A 05/07
8
TNY375-380
www.powerint.com
Applications Examples
The circuit shown in Figure 14 is a low cost universal AC input,
four-output flyback power supply utilizing a TNY376. The
continuous output power is 7.5 W with a peak of 13 W. The
output voltages are 3.3 V, 5 V, 12 V, and –12 V.
The rectified and filtered input voltage is applied to the primary
winding of T1. The other side of the transformer’s primary is
driven by the integrated MOSFET in U4. Diode D5, C3, R1, R2,
and VR1 compose the clamp circuit, limiting the leakage
inductance turn-off voltage spike on the DRAIN pin to a safe
value. The use of a combination Zener clamp and parallel RC
optimizes both EMI and energy efficiency.
Both the 3.3 V and 5V outputs are sensed through resistors R6
and R7. The voltage across R8 is regulated to 2.5 V by reference
IC U3. If the voltage across R8 begins to exceed 02.5 V, then
current will flow in the LED inside the optocoupler U2, driven by
the cathode of U3. This will cause the transistor of the
optocoupler to sink current. When the current exceeds the
ENABLE pin threshold current, the next switching cycle is
inhibited. Conversely, when the voltage across resistor R13 falls
below 2.5 V, and the current out of the ENABLE pin is below the
threshold, a conduction cycle is allowed to occur. By adjusting
the number of enabled cycles, 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 efficiency down to very
light loads, ideal for meeting energy efficiency requirements.
The input filter circuit (C1, L1 and C2) reduces conducted EMI.
To improve common mode EMI, this design makes use of
E-ShieldTM shielding techniques in the transformer. E-Shielding
thus reduces common mode displacement currents, reducing
EMI. These techniques, combined with the frequency jitter of
TNY376, give excellent EMI performance, with this design
achieving >10 dB
mV of margin to EN55022 Class B conducted
EMI limits.
For design flexibility, the value of C4 can be selected to pick one
of the three current limit options in U4. Doing so allows the
designer to select the current limit appropriate for the application.
Standard current limit is selected with a 0.1
mF BP/M pin
capacitor and is the normal choice for typical applications.
When a 1
mF BP/M pin capacitor is used, the current limit is
reduced, offering reduced RMS device currents and therefore
improved efficiency, but at the expense of maximum power
capability. This is ideal for thermally challenging designs where
dissipation must be minimized.
When a 10
mF BP/M pin capacitor is used, the current limit is
increased, extending the power capability for applications
requiring higher peak power or continuous power where the
thermal conditions allow.
Further flexibility comes from the current limits between adjacent
TinySwitch-PK family members being compatible. The reduced
current limit of a given device is equal to the standard current
limit of the next smaller device, and the increased current limit is
equal to the standard current limit of the next larger device.
D9
UF4003
U1
TNY376P
U2A
LTV817A
U3
L431
2%
C1
22 F
400 V
C2
22 F
400 V
C3
10 nF
1 kV
C4
10 F
50 V
C11
47 F
25 V
C14
100 nF
50 V
C13
10 F
50 V
C9
1000 F
10 V
C5
220 F
25 V
C10
470 F
10 V
C8
470 F
10 V
C6
100 F
25 V
C7
1000 F
25 V
C12
220 F
25 V
U2B
LTV817A
JP1
JP2
C5
330 pF
250 VAC
R1
100
R4
200
1/2 W
R6
20 k
1%
R5
1 k
R7
6.34 k
1%
R8
10 k
1%
R9
3.3 k
R2
47
R3
1
1/2 W
L1
5 mH
L2
3.3 H
L3
3.3 H
L4
3.3 H
F1
3.15 A
85-265
VAC
+12 V, 0.64 A
+5.0 V, 0.6 A
+3.3 V, 0.6 A
RTN
-12 V, 0.03 A
L
N
D1
FR106
D2
FR106
D5
FR106
D6
UF4003
D7
1N5819
D8
SB340
VR1
P6KE180A
D3
1N4007
D4
1N4007
PI-4673-051107
T1
EEL19
1
N.C.
6
11
7
8,9,10
12
4
3
5
D
S
EN/UV
BP
TinySwitch-PK
Figure 14. TNY376P, Four Output, 7.5 W, 13 W Peak Universal Input Power Supply.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TNY377PN | 功能描述:交流/直流开关转换器 23W 85-265 VAC 28 W 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 |
| TNY378G | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy-Efficient, Off-Line Switcher With Enhanced Peak Power Performance |
| TNY378GN | 功能描述:交流/直流开关转换器 27 W (85-265 VAC) 34 W (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 |
| TNY378GN-TL | 功能描述:交流/直流开关转换器 27 W (85-265 VAC) 34 W (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 |
| TNY378P | 制造商:POWERINT 制造商全称:Power Integrations, Inc. 功能描述:Energy-Efficient, Off-Line Switcher With Enhanced Peak Power Performance |
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