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參數資料
| 型號： | L6730BTR |
| 廠商： | 意法半導體 |
| 英文描述： | Adjustable step-down controller with synchronous rectification |
| 中文描述： | 可調式降壓同步整流控制器 |
| 文件頁數： | 34/52頁 |
| 文件大?。?/td> | 1370K |
| 代理商： | L6730BTR |
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Application details
L6730 - L6730B
34/52
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 into 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. D
MAX
is the maximum duty cycle value that in the L6730/B is 100%. For
a given inductor value, minimum input voltage, output voltage and maximum load transient, a
maximum ESR, and a minimum C
OUT
value can be set. The ESR and C
OUT
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, I
OUT
/2 with D = 0.5. The
losses in worst case are:
ESR
Iout
Vout
ESR
=
(7)
)
max
min
,
(
2
2
Vout
D
Vin
Cout
L
Iout
Vout
COUT
=
(8)
Vout
Cout
L
Iout
Vout
COUT
=
2
2
(9)
)
8
1
(
Fsw
Cout
ESR
I
Vout
L
+
=
(10)
)
1
D
D
Iout
Irms
=
(11)
2
)
5
Iout
ESR
P
=
(12)
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| L6730CTR | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
| L6730D | 功能描述:IC REG CTRLR BUCK PWM VM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:2,500 系列:- PWM 型:電流模式 輸出數:1 頻率 - 最大:500kHz 占空比:100% 電源電壓:8.2 V ~ 30 V 降壓:無 升壓:無 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:是 工作溫度:0°C ~ 70°C 封裝/外殼:8-DIP（0.300"，7.62mm） 包裝:管件 產品目錄頁面:1316 (CN2011-ZH PDF) |
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