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參數(shù)資料
| 型號： | L4992 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PQFP32 |
| 封裝： | TQFP-32 |
| 文件頁數(shù)： | 10/26頁 |
| 文件大?。?/td> | 296K |
| 代理商： | L4992 |
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PCB side and power traces on the other side.
7) Use heavy copper traces: this will reduce their resistance, increasing overall efficiency and will im-
prove their heat-sinking ability.
L4992 EVAL-KIT
The L4992 EVAL KIT is a fully assembled and tested demonstration board that implements a standard
application circuit, configured according to the following specifications:
Input Voltage Range: 6 to 25 V
3.3V Output: Iout3 = 3 A, Vrpp3
≤ 30 mV
5.1V Output: Iout5 = 3 A, Vrpp5
≤ 50 mV
12 V Output: Iout12 = 120 mA
Switching frequency: fsw = 300 kHz
The electrical schematic, illustrated in fig. 9, shows that some pull-up/down resistor are added to the
components strictly needed in a real application. Along with a quad dip-switch, they allow to set manually
the logic signals that control the chip operation. These signals are in the present case:
- Switch 1: RUN5 (0= 5.1V OFF, 1= 5.1V ON)
- Switch 2: NOSKIP (0= pulse-skipping ON, 1= pulse-skipping OFF)
- Switch 3: OSC (0= 200 kHz, 1= 300 kHz)
- Switch 4: RUN3 (0= 3.3V OFF, 1= 3.3V ON)
The demonstration board is delivered with the switches configured as illustrated in fig. 8.
Switches 1 and 4 enable/disable the two PWM sections (switch 4 manages the +12V linear regulator as
well). They must be set on 1 to turn on the regulators.
Please note that as long as each regulator is disabled, the relevant low-side MOSFET is in ON state.
Hence, if the load is capable of sourcing current, it will be short-circuited to ground through the choke
and the low-side MOS.
Although the default switching frequency is 300 kHz (switch 3 set on 1) and the passive components
have been selected for this frequency, the demo board will work satisfactorily at 200 kHz as well. Actu-
ally, at 200 kHz the regulators exhibit the maximum efficiency and the maximum extension of the input
voltage range downwards. On the other hand, the output ripple is greater and the dynamic behaviour
slightly worse.
The demostration board, as it is, does not provide an interface for synchronization. Anyway, it is possible
to synchronize the oscillator (with an appropriate signal: 5V amplitude pulses, spaced out by 400 ns
min.), provided the switch is set on 1, simply by feeding the signal into the middle of the divider R8-R9. In
this way, synchronization can be achieved at a frequency higher than 300 kHz. To synchronize the oscil-
lator to a frequency between 200 and 300 kHz, heavier interventions on the board are needed.
DESIGN PROCEDURE (continued)
12
3
4
0
1
Figure 8: Default switches configuration
L4992
18/26
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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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