參數(shù)資料
型號： LTC1142L
廠商： Linear Technology Corporation
英文描述： OCTAL BUS TRANSCEIVER O.C. 20-PDIP 0 to 70
中文描述： 雙通道高效率同步降壓型開關(guān)穩(wěn)壓器
文件頁數(shù)： 17/20頁
文件大?。?/td> 401K
代理商： LTC1142L
17
LTC1142/LTC1142L/LTC1142HV
APPLICATIU
providing that the loop remains in continuous mode
operation.
Burst Mode
operation can be suppressed at low output
currents with a simple external network which cancels the
25mV minimum current comparator threshold. This tech-
nique is also useful for eliminating audible noise from
certain types of inductors in high current (I
OUT
> 5A)
applications when they are lightly loaded.
An external offset is put in series with the Sense
–
pin to
subtract from the built-in 25mV offset. An example of this
technique is shown in Figure 10. Two 100
resistors are
inserted in series with the sense leads from the sense
resistor.
W
U
U
R
SENSE
1000pF
R2
100
R1
100
R3
+
C
OUT
V
OUT
SENSE
+
[PIN 1(15)]
SENSE
–
[PIN 28(14)]
1142 F10
Figure 10. Suppression of Burst Mode Operation
With the addition of R3 a current is generated through R1
causing an offset of:
V
V
R
+
R
R
OFFSET
OUT
=
×
1
1
3
If V
OFFSET
> 25mV, the built-in offset will be cancelled and
Burst Mode
operation is prevented from occurring. Since
V
OFFSET
is constant, the maximum load current is also
decreased by the same offset. Thus, to get back to the
same I
MAX
, the value of the sense resistor must be lower:
R
mV
I
SENSE
MAX
≈
75
To prevent noise spikes from erroneously tripping the
current comparator, a 1000pF capacitor is needed across
Pins 1 (15) and Pins 28 (14).
TYPICAL APPLICATIO
S
N
U
1000pF
+
+
+
1000pF
PDRIVE 1
SENSE
+
1
SENSE
–
1
NDRIVE 1
PGND1 SGND1 C
T1
5
I
TH1
I
TH2
C
T2
SGND2 PGND2
18
NDRIVE 2
SENSE
–
2
V
FB2
V
FB1
SENSE
+
2
PDRIVE 2
V
IN1
SHUTDOWN 1
SHUTDOWN 2
V
IN2
LTC1142HV-ADJ
C
270pF
4
25
27
R
C1
1k
13
R
C2
1k
11
19
C
3300pF
C
3300pF
C
270pF
0.22
μ
F
3
24
17
100pF
100pF
10
9
15
14
16
20
23
1
28
2
6
V
5V/2A
C
OUT2
220
F
10V
×
2
R
0.05
P-CH
Si9430DY
L2
33
μ
H
D2
MBRS130T3
N-CH
Si9410DY
0V = NORMAL
>1.5V = SHUTDOWN
0.22
μ
F
C
IN2
22
μ
F
35V
×
2
C
IN1
22
μ
F
35V
×
2
P-CH
Si9430DY
N-CH
Si9410DY
D1
MBRS130T3
C
OUT1
220
F
10V
×
2
L1
25
μ
H
R
0.05
R2
100k
1%
R4
150k
1%
R3
49.9k
1%
R1
52.3k
1%
V
3.6V/2A
V
5.2V TO 18V
R
R
: KRL SL-1/2-R050J
L1: COILTRONICS CTX25-4
L2: COILTRONICS CTX33-5
1142 F11
+
Figure 11. LTC1142HV-ADJ Dual Regulator with 3.6V/2A and 5V/2A Outputs
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1142L-ADJ 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators
LTC1142LCG-ADJ 功能描述:IC REG CTRLR BUCK PWM CM 28-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
LTC1142LCG-ADJ#PBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
LTC1142LCG-ADJ#TR 功能描述:IC REG CTRLR BUCK PWM CM 28-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
LTC1142LCG-ADJ#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR)
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