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參數(shù)資料
| 型號(hào)： | L4992 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TRIPLE OUTPUT POWER SUPPLY CONTROLLER |
| 中文描述： | 三路輸出電源控制器 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 296K |
| 代理商： | L4992 |
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An auxiliary winding could be used also on the choke of the +5.1V section, either to power the +12V lin-
ear regulator or to derive a further supplemental output, however the 3.3 V section has been provided
with some features aimed at ensuring a proper operation under all circumstances.
For a correct operation of the regulator, the voltage at pin V13IN must not be too low. The flyback con-
nection of the two windings ensures a well regulated voltage, provided there is good magnetic coupling.
The coupled inductors configuration, however, is not able to sustain the auxiliary voltage if the main out-
put is lightly loaded: the secondary voltage drops and the system goes out of regulation.
To overcome this problem, when the V13IN voltage falls below a certain threshold (13.7 V +/- 5%) be-
cause of too light a load on the 3.3V section, the relevant synchronous rectifier is turned on for 1.5
μ
s
max. during the interval in which the inductor current is zero ("one-shot" feature, see fig. 6). In this way,
the inductor current reverses and draws from the output capacitor energy which is forward transferred to
the auxiliary output.
In case the 3.3V section is working at full load and the linear regulator is lightly loaded, the voltage at pin
V13IN can exceed the expected value. In fact, Ds and Cs act as a peak-holding circuit and V13IN is in-
fluenced by the voltage spikes at switching transients. An internal clamp limits the voltage but, in case of
intervention, the chip power dissipation will rise.
When the 3.3V regulator is disabled, the linear regulator is disabled as well and is placed in a low-power
mode to reduce device consumption.
Figure 5:
12V regulator supply with auxiliary winding.
DETAILED FUNCTIONAL DESCRIPTION
(continued)
1
n
D
S
C
S
to V13IN
3.3V
D97IN575
t
t
t
H3GATE
L3GATE
IL
D97IN576A
1.5
μ
s
t
V13IN
13.7V
Figure 6:
"One shot" feature to sustain V13IN voltage.
L4992
10/26
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| L4993 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Low drop voltage regulator |
| L4993D | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993DTR | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993MD | 功能描述:低壓差穩(wěn)壓器 - LDO Low drop voltage regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| L4993MDTR | 功能描述:低壓差穩(wěn)壓器 - LDO 5V 150mA LW DROP VLT REGULATOR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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