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参数资料
| 型号： | LTC1142CG#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 250kHz |
| 占空比： | 100% |
| 电源电压： | 3.5 V ~ 18 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 包装： | 带卷 (TR) |
LTC1142/LTC1142L/LTC1142HV
APPLICATIO S I FOR ATIO
V OFFSET OUT ? ?
?
R SENSE ≈
maybeloadedwithoutregardtotheprimaryoutputload,
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.
With the addition of R3 a current is generated through R1
causing an offset of:
? R 1 ?
= V
? R 1 + R 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:
75mV
I MAX
SENSE +
[PIN 1(15)]
R2
100 ?
To prevent noise spikes from erroneously tripping the
current comparator, a 1000pF capacitor is needed across
SENSE –
[PIN 28(14)]
1000pF
R1
100 ?
+
R SENSE
V OUT
Pins 1 (15) and Pins 28 (14).
R3
C OUT
1142 F10
Figure 10. Suppression of Burst Mode Operation
TYPICAL APPLICATIO S
(For additional high efficiency circuits, see Application Note 54)
V IN
5.2V TO 18V
SENSE 1
V OUT1
3.6V/2A
R SENSE1
0.05 ?
+
C IN1
22 μ F
35V
× 2
L1
27 μ H
0.22 μ F
P-CH
Si9430DY
23
1
1000pF
28
24
V IN1
PDRIVE 1
+
SENSE – 1
3
SHDN1
0V = NORMAL
>1.5V = SHDN
LTC1142HV-ADJ
17
SHDN2
10
V IN2
PDRIVE 2
SENSE + 2
SENSE – 2
9
15
14
0.22 μ F
P-CH
Si9430DY
1000pF
L2
33 μ H
+
C IN2
22 μ F
35V
× 2
R SENSE2
0.05 ?
V OUT2
5V/2A
C OUT1
220 μ F
10V
× 2
+
R2
100k
1%
R1
52.3k
1%
D1
MBRS130T3
100pF
N-CH
Si9410DY
2
6
NDRIVE 1 NDRIVE 2
5 4 25 27 13 11 18 19
PGND1 SGND1 C T1 I TH1 I TH2 C T2 SGND2 PGND2
R C1 R C2
1k 1k
C T1 C C1 C C2 C T2
270pF 3300pF 3300pF 270pF
V FB1 V FB2
16
20
N-CH
Si9410DY
D2
MBRS130T3
100pF
R4
150k
1%
R3
49.9k
1%
+
C OUT2
220 μ F
10V
× 2
R SENSE1, R SENSE2 : DALE WSL-2010-.05
L1: SUMIDA CDRH125-270
1142 F11
L2: SUMIDA CDRH125-330
Figure 11. LTC1142HV-ADJ Dual Regulator with 3.6V/2A and 5V/2A Outputs
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1142HV | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1142HV-ADJ | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual High Efficiency Synchronous Step-Down Switching Regulators |
| LTC1142HVCG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1142HVCG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC1142HVCG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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