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參數(shù)資料
| 型號(hào)： | MAX1655 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| 中文描述： | 高效率、PWM、降壓型DC-DC控制器，16引腳QSOP封裝 |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 265K |
| 代理商： | MAX1655 |
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M
High-Effic ienc y, PWM, S tep-Down
DC-DC Controllers in 16-Pin QS OP
______________________________________________________________________________________
19
output voltage as determined by the turns ratio is +15V,
the feedback resistor ratio should be set to produce
about +13.5V; otherwise, the SECFB one-shot might be
triggered unintentionally, causing an unnecessary
increase in supply current and output noise. In negative-
output (MAX1654) applications, the resistor-divider acts
as a load on the internal reference, which in turn can
cause errors at the main output. Avoid overloading REF
(see the Reference Load-Regulation Error vs. Load
Current graph in the Typical Operating Characteristics).
100k
is a good value for R3 in MAX1654 circuits.
Output current on secondary winding applications is
limited at low input voltages. See the MAX1652
Maximum Secondary Output Current vs. Supply Voltage
graph in the Typical Operating Characteristics for data
from the application circuit of Figure 8.
S oft-S tart Circ uit (S S )
Soft-start allows a gradual increase of the internal cur-
rent-limit level at start-up for the purpose of reducing
input surge currents, and perhaps for power-supply
sequencing. In shutdown mode, the soft-start circuit
holds the SS capacitor discharged to ground. When
SHDN
goes high, a 4μA current source charges the SS
capacitor up to 3.2V. The resulting linear ramp wave-
form causes the internal current-limit level to increase
proportionally from 0 to 100mV. The main output capaci-
tor thus charges up relatively slowly, depending on the
SS capacitor value. The exact time of the output rise
depends on output capacitance and load current and is
typically 1ms per nanofarad of soft-start capacitance.
With no SS capacitor connected, maximum current limit
is reached within 10μs.
S hutdown
Shutdown mode (
SHDN
= 0V) reduces the V+ supply
current to typically 3μA. In this mode, the reference and
VL are inactive.
SHDN
is a logic-level input, but it can
be safely driven to the full V+ range. Connect
SHDN
to
V+ for automatic start-up. Do not allow slow transitions
(slower than 0.02V/μs) on
SHDN
.
MAX1652
FB
GND
REF
SYNC
5
SECFB
VL
10
2
11
7
3
14
Si9410
Si9410
D2
EC11FS1
T1 = TRANSPOWER TTI5870
* = OPTIONAL, MAY NOT BE NEEDED
16
15
13
D1
CMPSH
-3A
1N5819
12
8
9
V
IN
(6.5V TO18V)
+15V AT
250mA
+5V
AT 3A
6
ON/OFF
1
CSL
CSH
BST
V+
DH
LX
DL
PGND
SHDN
SS
0.33
μ
F
C2
4.7
μ
F
C3
15
μ
F
2.5V
220
μ
F
10V
220
μ
F
10V
0.1
μ
F
22
μ
F, 35V
22
μ
F, 35V
0.01
μ
F
20m
22
*
4700pF*
T1
15
μ
H
2.2:1
49.9k, 1%
210k, 1%
0.01
μ
F
(OPTIONAL)
18V
1/4 W
C2
4.7
μ
F
4
Figure 8. 5V/15V Dual-Output Application Circuit (MAX1652)
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PDF描述 |
|---|---|
| MAX1655EEE | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
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| MAX1654EEE | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1655EEE | 功能描述:DC/DC 開關(guān)控制器 PWM Step-Down 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(fēng)格: 封裝 / 箱體:CPAK |
| MAX1655EEE+ | 功能描述:DC/DC 開關(guān)控制器 PWM Step-Down 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(fēng)格: 封裝 / 箱體:CPAK |
| MAX1655EEE+T | 功能描述:DC/DC 開關(guān)控制器 PWM Step-Down 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(fēng)格: 封裝 / 箱體:CPAK |
| MAX1655EEE-T | 功能描述:DC/DC 開關(guān)控制器 PWM Step-Down 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(fēng)格: 封裝 / 箱體:CPAK |
| MAX1655ESE | 功能描述:DC/DC 開關(guān)控制器 PWM Step-Down 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(fēng)格: 封裝 / 箱體:CPAK |
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