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SC2434

更新时间： 2024-10-01 04:05:27
品牌 Logo 应用领域
商升特 - SEMTECH 控制器
页数 文件大小 规格书
19页 306K
描述
TriPhase Current Mode Controller with Power Good

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中文翻译

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SC2434 数据手册

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SC2434  
TriPhase Current Mode Controller  
with Power Good  
POWER MANAGEMENT  
Description  
Features  
! 12V input  
The SC2434, a tri-phase, current mode controller is  
designed to work with Semtech smart synchronous  
drivers, such as the SC1205, SC1206, and SC1207 to  
provide the DC/DC converter solution for the most  
demanding Microprocessor applications. Input current  
sensing is used to guarantee precision phase to phase  
current matching using a single sense resistor on the  
input power line. This topology reduces the power loss  
and complexity associated with output current sense  
methods. Multi phase operation allows significant  
reduction in input/output ripple while enhancing  
transient response. Two or three phase operation is  
selectable. The DAC step size and range are program-  
mable with external components thus allowing compliance  
with new and emerging VID ranges. A novel approach  
implements active droop to minimize output capacitors  
during load transients.  
! Input sensing current mode control  
! Selectable 2 or 3 phase operation  
! Precision, pulse by pulse phase current matching  
! Active drooping allows for best transient response  
! Programmable internal oscillator to 1.5 MHz  
! Programmable DAC step size/offset allows compli-  
ance with VRM9.0 and VRM9.2  
! VID 11111 Inhibit (No CPU)  
! Externally programmable soft-start  
! 0% minimum duty cycle improves transient  
response  
! Cycle by cycle current limiting plus hiccup  
! Power good signal  
Applications  
! Intel Pentium-4 microprocessors  
! High performance desktop systems  
Typical Application Circuit  
L1  
+12V_ATX  
R1 3m  
+12V  
600nH  
C1  
2200uF/16v  
+
+
+
C5  
C6  
R2  
2R2  
D1  
C4  
1uF  
C75 0.33uF  
M1  
C2  
C3  
2200uF/16v  
2200uF/16v  
4.7uF  
4.7uF  
1N4148  
L2  
VOUT  
R5  
20  
R4  
1R  
1
8
7
6
5
600nH  
DRN PGND  
R3  
2R2  
2
3
4
VCCVID_PWRGD(Open Collector Input)  
TG  
BG  
VS  
EN  
D4  
1N4148  
BST  
CO  
R6  
C7  
1500uF/6.3V  
1
R29  
100  
M2  
SM/R_1206  
U1  
C8  
1uF  
C11  
C10  
1500uF/6.3V  
SC1205  
C9  
1nF  
2.2nF  
VID4  
VID3  
VID2  
VID1  
VID0  
Differential  
Pair  
C12 1uF  
C14  
1500uF/6.3V  
C15  
1uF  
C16  
4.7uF  
+12V  
M3  
R9  
D2  
1N4148  
C17  
1uF  
R8  
NO POP  
C76 0.33uF  
C18  
1500uF/6.3V  
2R2  
L3  
U2  
1
2
3
4
5
6
7
8
9
20  
R10  
1R  
C19  
1500uF/6.3V  
VID4  
VID3  
VID2  
VID1  
VID0  
PGIN  
VCC  
BGOUT  
OUT1  
OUT2  
OUT3  
PC  
19  
18  
17  
16  
15  
14  
13  
12  
11  
1
8
7
6
5
600nH  
DRN PGND  
TG  
BST  
CO  
2
3
4
+5V_ATX  
BG  
VS  
EN  
+5V  
C13  
10nF  
D5  
1N4148  
C20  
1500uF/6.3V  
R11  
1
SM/R_1206  
M4  
U3  
C21  
1500uF/6.3V  
C23  
SC1205  
C22  
1nF  
2.2nF  
R13  
5.1K  
C25  
1500uF/6.3V  
V_PULL_UP  
PWR_GOOD  
ERROUT  
PGOUT  
FB  
AGND  
OC-  
C24 1uF  
+12V  
M5  
C26  
1500uF/6.3V  
OC+  
10  
R14  
2R2  
D3  
1N4148  
C27  
1uF  
OSCREF DACREF  
C77 0.33uF  
C28  
1500uF/6.3V  
SC2434  
R15  
1K  
L4  
C29  
100nF  
R_COMP  
75K  
R_OSC  
31.6K  
R_DAC  
37.4K  
R16  
1R  
R_DRP  
187K  
C30  
1500uF/6.3V  
1
8
7
6
5
600nH  
DRN PGND  
TG  
BST  
CO  
C31  
470pF  
2
3
4
BG  
VS  
EN  
C_COMP  
18pF  
D6  
1N4148  
R17  
1
C32  
1500uF/6.3V  
M6  
SM/R_1206  
U4  
+5V  
C34  
SC1205  
C33  
1nF  
R_OS  
46.4K  
R_FB  
10K  
R19  
750  
R20  
1K  
2.2nF  
PGND  
C35 1uF  
Differential  
Pair  
AGND  
May 18, 2005  
1
www.semtech.com  
1234567...19

中文翻译

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