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參數(shù)資料
| 型號(hào)： | TOP414G |
| 廠商： | POWER INTEGRATIONS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0-21 W TOPSwitch using a 18-90 VDC input |
| 中文描述： | 4.25 A SWITCHING REGULATOR, 132 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MS-001-AB, SMD-8 |
| 文件頁(yè)數(shù)： | 3/16頁(yè) |
| 文件大?。?/td> | 434K |
| 代理商： | TOP414G |
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A
4/99
TOP412/414
3
TOPSwitch
Family Functional Description
TOPSwitch
is a self biased and protected linear control current-
to-duty cycle converter with an open drain output. High
efficiency is achieved through the use of CMOS and integration
of the maximum number of functions possible. CMOS
significantly reduces bias currents as compared to bipolar or
discrete solutions. Integration eliminates external power resistors
used for current sensing and/or supplying initial start-up bias
current.
During normal operation, the internal output MOSFET duty
cycle linearly decreases with increasing CONTROL pin current
as shown in Figure 4. To implement all the required control,
bias, and protection functions, the DRAIN and CONTROL pins
each perform several functions as described below. Refer to
Figure 2 for a block diagram and Figure 6 for timing and voltage
waveforms of the
TOPSwitch
integrated circuit.
Control Voltage Supply
CONTROL pin voltage V
is the supply or bias voltage for the
controller and driver circuitry. An external bypass capacitor
closely connected between the CONTROL and SOURCE pins
is required to supply the gate drive current. The total amount of
capacitance connected to this pin (C
) also sets the auto-restart
timing as well as control loop compensation. V
is regulated in
either of two modes of operation. Hysteretic regulation is used
for initial start-up and overload operation. Shunt regulation is
used to separate the duty cycle error signal from the control
circuit supply current. During start-up, V
current is supplied
from a high-voltage switched current source connected internally
between the DRAIN and CONTROL pins. The current source
provides sufficient current to supply the control circuitry as
well as charge the total external capacitance (C
T
).
PI-1691-112895
DMAX
DMIN
ICD1
D
IC (mA)
2.5
6.5
45
Slope = PWM Gain
-16%/mA
IB
Auto-restart
Figure 4. Relationship of Duty Cycle to CONTROL Pin Current.
Figure 5. Start-up Waveforms for (a) Normal Operation and (b)
Auto-restart.
DRAIN
0
VIN
VC
0
4.7 V
5.7 V
8 Cycles
95%
5%
Off
Switching
Switching
Off
IC
Charging CT
ICD1
Discharging CT
ICD2
Discharging CT
IC
Charging CT
Off
PI-1124A-060694
DRAIN
0
VIN
VC
0
4.7 V
5.7 V
Off
Switching
(b)
(a)
C
T
is the total external capacitance
connected to the CONTROL pin
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| TOP414GN | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 12 W 48 VDC 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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP414GN-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 12 W 48 VDC 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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| TOP414G-TL | 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 12 W 48 VDC 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(guān)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(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
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