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參數(shù)資料
| 型號： | L6732CTR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | HTSSOP-16 |
| 文件頁數(shù)： | 15/32頁 |
| 文件大?。?/td> | 905K |
| 代理商： | L6732CTR |
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6 Application details
L6732C
22/32
6.2
Output capacitors
The output capacitors are basic components for the fast transient response of the power
supply. They depend on the output voltage ripple requirements, as well as any output voltage
deviation requirement during a load transient. During a load transient, the output capacitors
supply the current to the load or absorb the current stored in the inductor until the converter
reacts. In fact, even if the controller recognizes immediately the load transient and sets the duty
cycle at 100% or 0%, the current slope is limited by the inductor value. The output voltage has
a first drop due to the current variation inside the capacitor (neglecting the effect of the ESL):
Moreover, there is an additional drop due to the effective capacitor discharge or charge that is
given by the following formulas:
Formula (8) is valid in case of positive load transient while the formula (9) is valid in case of
negative load transient. DMAX is the maximum duty cycle value that in the L6732C is 100%. For
a given inductor value, minimum input voltage, output voltage and maximum load transient, a
maximum ESR and a minimum COUT value can be set. The ESR and COUT values also affect
the static output voltage ripple. In the worst case the output voltage ripple can be calculated
with the following formula:
Usually the voltage drop due to the ESR is the biggest one while the drop due to the capacitor
discharge is almost negligible.
6.3
Input capacitors
The input capacitors have to sustain the RMS current flowing through them, that is:
Where D is the duty cycle. The equation reaches its maximum value, IOUT /2 with D = 0.5. The
losses in worst case are:
ESR
Iout
Vout
ESR
=
(7)
)
max
min
,
(
2
Vout
D
Vin
Cout
L
Iout
Vout
COUT
=
(8)
Vout
Cout
L
Iout
Vout
COUT
=
2
(9)
)
8
1
(
Fsw
Cout
ESR
I
Vout
L
+
=
(10)
)
1
(
D
Iout
Irms
=
(11)
2
)
5
.
0
(
Iout
ESR
P
=
(12)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6732TR | 功能描述:DC/DC 開關(guān)控制器 VOLTAGE REGULATOR RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| L6733 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6733TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller |
| L6738 | 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| L6738A | 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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