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參數資料
| 型號： | TOP100YAI |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁數： | 6/20頁 |
| 文件大小： | 166K |
| 代理商： | TOP100YAI |
E
7/96
6
TOP100-4
current will flow into the control pin.
Increasing control pin current decreases
the duty cycle until a stable operating
point is reached. The output voltage is
proportional to the bias voltage by the
turns ratio of the output to bias windings.
C5 is used to bypass the CONTROL pin.
C5 also provides loop compensation for
the power supply by shunting AC
currents around the CONTROL pin
dynamic impedance, and also determines
the auto-restart frequency during start-
up and auto-restart conditions. See DN-
8 for more information regarding bias
supplies.
General Circuit Operation
Primary Feedback Regulation
The circuit shown in Figure 7 is a simple
5 V, 5 W bias supply using the TOP100.
This flyback power supply employs
primary-side regulation from a
transformer bias winding. This approach
is best for low-cost applications requiring
isolation and operation within a narrow
range of load variation. Line and load
regulation of
±
5% or better can be
achieved from 10% to 100% of rated
load.
Voltage feedback is obtained from the
transformer (T1) bias winding, which
eliminates the need for optocoupler and
secondary-referenced error amplifier.
High-voltage DC is applied to the
primary winding of T1. The other side
of the transformer primary is driven by
Figure 7. Schematic Diagram of a Minimum Parts Count 5 V, 5 W Bias Supply Utilizing the TOP100.
the integrated high-voltage MOSFET
transistor within the TOP100 (U1). The
circuit operates at a switching frequency
of 100 kHz, set by the internal oscillator
of the TOP100. The clamp circuit
implemented by VR1 and D1 limits the
leading-edge voltage spike caused by
transformer leakage inductance to a safe
value. The 5 V power secondary winding
is rectified and filtered by D2, C2, C3,
and L1 to create the 5 V output voltage.
The output of the T1 bias winding is
rectified and filtered by D3, R1, and C5.
The voltage across C5 is regulated by
U1, and is determined by the 5.7 V
internal shunt regulator at the
CONTROL pin of U1. When the
rectified bias voltage on C5 begins to
exceed the shunt regulator voltage,
PI-1767-020296
5 V
RTN
C5
47
μ
F
U1
TOP100YAI
D2
1N5822
D3
1N4148
L1
(Bead)
C2
330
μ
F
25 V
C3
150
μ
F
25 V
T1
D1
UF4004
DC
INPUT
VR1
P6KE91
R1
22
CIRCUIT PERFORMANCE:
Load Regulation - ±4%
(10% to 100%)
Line Regulation - ±1.5%
95 to 185 V DC
Ripple Voltage ±25 mV
DRAIN
SOURCE
CONTROL
相關PDF資料 |
PDF描述 |
|---|---|
| TOP100YAI* | 0-60 W TOPSwitch using a 100/110 VAC input |
| TOP101YAI | Analog IC |
| TOP101YAI* | 0-60 W TOPSwitch using a 100/110 VAC input |
| TOP102YAI | Analog IC |
| TOP102YAI* | 0-60 W TOPSwitch using a 100/110 VAC input |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TOP100YN | 功能描述:交流/直流開關轉換器 0-20 W 100/110 VAC RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP101AI | 制造商:POWERINT 制造商全稱:Power Integrations, Inc. 功能描述:Three-terminal Off-line PWM Switch |
| TOP101YAI | 功能描述:交流/直流開關轉換器 15-35 W 100/110 VAC RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開關頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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