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參數(shù)資料
| 型號(hào)： | MAX1639 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Speed Step-Down Controller with Synchronous Rectification for CPU Power |
| 中文描述： | 高速、同步整流、降壓型控制器，用于CPU電源 |
| 文件頁(yè)數(shù)： | 7/13頁(yè) |
| 文件大小： | 108K |
| 代理商： | MAX1639 |
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M
High-S peed S tep-Down Controller with
S ync hronous Rec tific ation for CPU Power
_______________________________________________________________________________________
7
Table 1. Component List for Standard Applications
(x5) 560μF, Sanyo OS-CON 4SP560M
Schottky diode, Motorola MBRD640
Central Semiconductor CMPSH-3
0.3μH, 25A, 0.9m
Panasonic ETQPAF0R3E
(x2) 7m
, Dale WSL-2512-R007-J
(x3) 330μF, Sanyo OS-CON 6SA330M
LOAD REQUIREMENT
(x2) 0.010
, 30V, D
2
PAK, Fairchild FDB7030L
(x2) 0.014
, 30V, SO8, Fairchild FDS6680
(x2) 0.010
, 30V, D
2
PAK, Fairchild FDB7030L
(x2) 0.014
, 30V, SO8, Fairchild FDS6680
1.8V, 20A
C2
(x2) 560μF, Sanyo OS-CON 4SP560M
Schottky diode, Nihon NSQ03A02
Central Semiconductor CMPSH-3
1.0μH, 9.3A, SMD
Coiltronics UP2B-1R0
1.0μH, 10A, SMD
Coilcraft D03316P-102HC
0.014
, 30V, SO8
Fairchild FDS6680
0.018
, 30V, SO8
International Rectifier IRF7413
0.014
, 30V, SO8
Fairchild FDS6680
0.018
, 30V, SO8
International Rectifier IRF7413
9m
Dale,
WSL-2512-R009-J
10.0k
, 1%
12.7k
, 1%
330μF, Sanyo OS-CON 6SA330M
D1 (optional)
D2
N1
N2
2.5V, 8A
L1
R1
COMPONENT
C1
Note:
Parts used in evaluation board are shown in bold.
PWM Controller Bloc k and Integrator
The heart of the current-mode PWM controller is a
multi-input, open-loop comparator that sums three sig-
nals (Figure 2): the buffered feedback signal, the cur-
rent-sense signal, and the slope-compensation ramp.
This direct-summing configuration approaches ideal
cycle-by-cycle control over the output voltage. The out-
put voltage error signal is generated by an error ampli-
fier that compares the amplified feedback voltage to an
internal reference.
Each pulse from the oscillator sets the main PWM latch
that turns on the high-side switch for a period deter-
mined by the duty factor (approximately V
OUT
/ V
IN
). The
current-mode feedback system regulates the peak
inductor current as a function of the output voltage error
signal. Since average inductor current is nearly the same
as peak current (assuming the inductor value is set rela-
tively high to minimize ripple current), the circuit acts as
a switch-mode transconductance amplifier. It pushes the
second output LC filter pole, normally found in a duty-
factor-controlled (voltage-mode) PWM, to a higher fre-
quency. To preserve inner-loop stability and eliminate
regenerative inductor current staircasing, a slope-
compensation ramp is summed into the main PWM com-
parator. Under fault conditions where the inductor cur-
rent exceeds the maximum current-limit threshold, the
high-side latch resets, and the high-side switch turns off.
Internal Referenc e
The internal 3.5V reference (REF) is accurate to ±1%
from 0°C to +85°C, making REF useful as a system ref-
erence. Bypass REF to AGND with a 0.1μF (min)
ceramic capacitor. A larger value (such as 2.2μF) is
recommended for high-current applications. Load reg-
ulation is 10mV for loads up to 100μA. Reference
undervoltage lockout is between 2.7V and 3V. Short-
circuit current is less than 4mA.
S ync hronous-Rec tifier Driver
Synchronous rectification reduces conduction losses in
the rectifier by shunting the normal Schottky diode or
MOSFET body diode with a low-on-resistance MOSFET
switch. The synchronous rectifier also ensures proper
start-up by precharging the boost-charge pump used
for the high-side switch gate-drive circuit. Thus, if you
must omit the synchronous power MOSFET for cost or
other reasons, replace it with a small-signal MOSFET,
such as a 2N7002.
The DL drive waveform is simply the complement of the
DH high-side drive waveform (with typical controlled
dead time of 30ns to prevent cross-conduction or
shoot-through). The DL output’s on-resistance is 0.7
(typ) and 2
(max).
10.0k
, 1%
6.19k
, 1%
R7
R8
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1639ESE | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1639ESE+ | 功能描述:DC/DC 開(kāi)關(guān)控制器 High Speed Step Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1639ESE+T | 功能描述:DC/DC 開(kāi)關(guān)控制器 High Speed Step Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1639ESE-T | 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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 |
| MAX1639EVKIT | 功能描述:DC/DC 開(kāi)關(guān)控制器 Evaluation Kit the MAX1639 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)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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