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參數(shù)資料
| 型號(hào)： | LTC1436A-PLL |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 20/28頁(yè) |
| 文件大?。?/td> | 518K |
| 代理商： | LTC1436A-PLL |
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20
LTC1436A
LTC1436-PLL-A/LTC1437A
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 11a. 12V Output Auxiliary Regulator Using
Internal Feedback Resistors
The minimum on-time for the LTC1436A/LTC1437A in a
properly configured application is less than 300ns but
increases at low ripple current amplitudes (see Figure 12).
If an application is expected to operate close to the
minimum on-time limit, an inductor value must be chosen
that is low enough to provide sufficient ripple amplitude to
meet the minimum on-time requirement. To determine the
proper value, use the following procedure:
1. Calculate on-time at maximum supply, t
ON(MIN)
=
(1/f)(V
OUT
/V
IN(MAX)
).
2. Use Figure 12 to obtain the peak-to-peak inductor ripple
current as a percentage of I
MAX
necessary to achieve
the calculated t
ON(MIN)
.
3. Ripple amplitude
I
L(MIN)
= (% from Figure 12) (I
MAX
)
where I
MAX
= 0.1/R
SENSE
.
4. L
MAX
=
t
V
V
I
ON MIN
(
IN MAX
(
OUT
L MIN
(
)
)
)
–
Choose an inductor less than or equal to the calculated
L
MAX
to ensure proper operation.
1436 F11a
V
SEC
= 1.19V 1 + R5
(
)
ON/OFF
V
SEC
SECONDARY WINDING
R6
R5
10
μ
F
1:N
V
OAUX
12V
AUXDR
LTC1436A
LTC1437A
AUXFB
AUXON
+
SFB
+
Figure 11c. Auxiliary Comparator Configuration
–
+
AUXON
AUXFB
ON/OFF
INPUT
V
PULL-UP
<
8.5V
AUXDR
OUTPUT
1436 F11c
1.19V REFERENCE
LTC1436A
LTC1437A
Figure 11b. 5V Output Auxiliary Regulator Using
External Feedback Resistors
ON/OFF
V
SEC
SECONDARY WINDING
R6
R5
R8
R7
1436 F11b
10
μ
F
1:N
V
OAUX
AUXDR
LTC1436A
LTC1437A
AUXFB
AUXON
(
V
SEC
= 1.19V 1 +
R6
R5
)
V
OAUX
= 1.19V 1 + R7
(
)
+
SFB
+
Minimum On-Time Considerations
Minimum on-time, t
ON(MIN)
, is the smallest amount of
time that the LTC1436A/LTC1437A are capable of turning
the top MOSFET on and off again. It is determined by
internal timing delays and the gate charge required to turn
on the top MOSFET. Low duty cycle applications may
approach this minimum on-time limit. If the duty cycle
falls below what can be accommodated by the minimum
on-time, the LTC1436A/LTC1437A will begin to skip cycles.
The output voltage will continue to be regulated, but the
ripple current and ripple voltage will increase. Therefore
this limit should be avoided.
Figure 12. Minimum On-Time vs Inductor Ripple Current
Because of the sensitivity of the LTC1436A/LTC1437A
current comparator when operating close to the minimum
on-time limit, it is important to prevent stray magnetic flux
generated by the inductor from inducing noise on the
current sense resistor, which may occur when axial type
cores are used. By orienting the sense resistor on the
radial axis of the inductor (see Figure 13), this noise will be
minimized.
INDUCTOR RIPPLE CURRENT (% OF I
MAX
)
0
200
M
250
300
350
400
RECOMMENDED
REGION FOR MIN
ON-TIME AND
MAX EFFICIENCY
10
20
30
40
1435A F12
50
60
70
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1436CGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1436CGN#PBF | 制造商:Linear Technology 功能描述:Step-Down Switching Regulators |
| LTC1436CGN-PLL | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1436IGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1436IGN-PLL | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
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