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參數資料
| 型號： | SC2677TSTRT |
| 廠商： | Semtech Corporation |
| 英文描述： | Dual Synchronous Voltage Mode Controller with Current Sharing Circuitry |
| 中文描述： | 雙同步電壓模式控制器的電流共享電路 |
| 文件頁數： | 1/9頁 |
| 文件大小： | 163K |
| 代理商： | SC2677TSTRT |
POWER MANAGEMENT
Description
1
www.semtech.com
SC2677
Dual Synchronous Voltage Mode
Controller with Current Sharing Circuitry
Features
Applications
Revision: NOV. 15, 2004
The SC2677 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. First, the SC2677 is ideal for applications
where point of use output power exceeds any single in-
put power budget. Alternatively, the SC2677 can be used
as a dual switcher. The SC2677 features a temperature
compensated voltage reference, an under voltage lock-
out over current protection and internal level-shifted, high-
side drive circuitry.
In current sharing configuration, the SC2677 can pro-
duce a single output voltage from two separate voltage
sources (which can be different voltage levels) while
maintaining current sharing between the channels. Cur-
rent sharing is programmable to allow loading each input
supply as required by the application.
In dual switcher configuration, two feedback paths are
provided for independent control of the separate outputs.
The device will provide a regulated output from flexibly
configured inputs (3.3V, 5V, 12V), provided 5V is present
for V
. The phasing between the two switchers is ad-
justable to minimize the input and output ripple.
300kHz to 1MHz externally programmable
frequency operation
Soft Start and Enable function
Power Good output provided
Under voltage short circuit protection
Phase-shifted switchers minimize ripple
High efficiency operation, >90%
Programmable output(s) as low as 0.5V
Industrial temperature range
TSSOP-20 package
Bias voltage as low as 4.5V
Adjustable phase shift between channels
Two Phase, Current Sharing Controller
Flexible, same or separate V
Programmable current sharing
Thermal distribution via multi-phase output
Graphics cards
Peripheral add-in card
Dual-Phase power supply
Power supplies requiring two outputs
Simplified Application Schematic
C7
M4
L1
1
2
+5V
L2
1
2
R2
C1
PWRGD
R7
C6
C5
R1
C3
1uF
+3.3V
C9
R6
0R0
R10
R8
R4
U1
SC2677
C
1
2
3
4
5
6
7
8
9
1
1
2
1
1
1
1
1
1
1
1
V
F
V
+
-
B
D
D
P
B
G
P
S
P
-
C
B
D
D
+12V
C4
R9
M2
Vout1
M1
R5
R11
+12V
C8
C10
ENABLE
Vout2
R3
C2
M3
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