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參數(shù)資料
| 型號(hào)： | UCC388DP |
| 英文描述： | Positive Adjustable Voltage Regulator |
| 中文描述： | 積極可調(diào)電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 9/19頁 |
| 文件大?。?/td> | 296K |
| 代理商： | UCC388DP |
SLUS458C AUGUST 2001 REVISED SEPTEMBER 2003
9
www.ti.com
APPLICATION INFORMATION
precautions
The absolute maximum supply voltage is 20 V, including any transients that may be present. If this voltage is
exceeded, device damage is likely. This is in contrast to the predecessor bipolar devices, which could survive
up to 30 V. Thus, the supply pin should be decoupled as close to the ground pin as possible. Also, since no clamp
is included in the device, the supply pin should be protected from external sources which could exceed the 20 V
level.
Careful layout of the printed board has always been a necessity for high frequency power supplies. As the device
switching speeds and operating frequencies increase the layout of the converter becomes increasingly
important.
This 8-pin device has only a single ground for the logic and power connections. This forces the gate drive current
pulses to flow through the same ground that the control circuit uses for reference. Thus, the interconnect
inductance should be minimized as much as possible. One implication is to place the device (gate driver)
circuitry close to the MOSFET it is driving. Note that this can conflict with the need for the error amplifier and
the feedback path to be away from the noise generating components.
circuit applications
Figure 4 shows a typical off-line application.
UDG01071
C53
1
COMP
2
FB
3
CS
4
RT/CT
8
REF
7
VCC
6
OUT
5
GND
UCC38C44
R6
C13
R16
T1
R12
C5
C12
D50
C52
D51
C3
R10
R11
C18
C1A
F1
BR1
+
RT1
L50
C54
R55
R53
R56
C55
R52
SEC
COMMON
12 V
OUT
R50
C50
C51
R50
IC3
R54
A
R
K
Q1
5 V
OUT
AC INPUT
100 Vac 240 Vac
EMI FILTER
REQUIRED
D2
D6
IC2
IC2
Figure 4. Typical Off-Line Application
Figure 5 shows the forward converter with synchronous rectification. This application provides 48 V to 3.3 V at
10 A with over 85% efficiency and uses the UCC38C42 as the secondary-side controller and UCC3961 as the
primary-side startup control device.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| UCC388DPTR | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
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| UCC3890 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Off-Line Battery Charger Circuit |
| UCC3895 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:BiCMOS Advanced Phase Shift PWM Controller |
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