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PDF SC2422ACSTR Data sheet ( Hoja de datos )
| Número de pieza | SC2422ACSTR | |
| Descripción | BIPHASE CURRENT MODE CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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BIPHASE CURRENT MODE
CONTROLLER
SC2422A
PRELIMINARY - August 7, 2000
DESCRIPTION
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
FEATURES
The SC2422A biphase, current mode controller is de-
signed to work with Semtech smart synchronous
drivers, such as the SC1205, SC1305 or the SC1405 to
provide the DC/DC converter solution for the most
demanding Micro-processor applications. Input current
rather than output current sensing is used to guarantee
precision phase to phase current matching using a
single sense resistor on the input power line. Accurate
current sharing and pulse by pulse current limit are
implemented without the power loss and transient re-
sponse degradation associated with output current
sense methods. Two phase operation allows significant
reduction in input/output ripple while enhancing tran-
sient response.
The DAC step size and range are programmable with
external components thus allowing compliance with
new and emerging VID ranges.
A novel approach implements active droop, minimizing
output capacitor requirements during load transients.
This avoids the pitfalls of the passive droop implemen-
tation. This feature also allows easy implementation of
N+1 redundancy and current sharing among modules.
Programmable Under Voltage Lockout assures proper
start-up and shutdown by synchronizing the controller
to the driver supply. Wide PWM frequency range allows
use of low profile, surface mount components.
TYPICAL APPLICATION SCHEMATIC
• Precision, pulse by pulse phase current match-
ing
• Active drooping allows for best transient response
• Input Sensing Current mode control
• Programmable DAC step size/offset allows
Compliance with VRM9.0, VRM8.3 or VRM8.4
• Externally programmable soft-start
• 5V or 12V input for next generation processors
• 0% minimum duty cycle improves transient re-
sponse
• Externally Programmable UVLO with hysteresis
• Cycle by cycle current limiting
• Programmable Internal Oscillator to 1 MHz
• VID IIIII Inhibit (No CPU)
APPLICATIONS
• Intel Advanced Microprocessors
• AMD AthlonTM power supplies
• Servers/Workstations, high density power supplies
ORDERING INFORMATION
DEVICE(1)
SC2422ACS.TR
PACKAGE
SO-16
TEMP. RANGE (TJ)
0 - 125°C
SC2422A.EVB
Evaluation Board
Note:
(1) Only available in tape and reel packaging. A reel con-
tains 1000 devices.
INPUT
Rsens
VIN
Rf
Ri
1 VID4
2 VID3
3 VID2
4
VID1
5 VID0
6 ERROUT
7
FB
8 RREF
VCC 16
BGOUT 15
OC+ 14
13
OUT1
OUT2 12
OC- 11
10
UVLO
GND 9
Rref
SC2422A
© 2000 SEMTECH CORP.
1 IN
3
VCC
4
VDD
DRVH 7
6
PHASE
5
DRVL
SC1305
1 IN
3
VCC
4
VDD
DRVH 7
6
PHASE
5
DRVL
VIN
SC1305
Vout
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
BIPHASE CURRENT MODE
CONTROLLER
PRELIMINARY - August 7, 2000
OUTPUT VOLTAGE (VRM 9.0)
Unless specified: 0 = GND; 1 = High (or Floating).
TA = 25°C, VCC = 5V, 2-Phase operation
VID4
VID3
11
11
11
11
11
11
11
11
10
10
10
10
10
10
10
10
01
01
01
01
01
01
01
01
00
00
00
00
00
00
00
00
VID2
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
VID1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
VID0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
SC2422A
VCCCORE
(VDC)
Output Off
1.1
1.125
1.15
1.175
1.2
1.225
1.250
1.275
1.3
1.325
1.35
1.375
1.4
1.425
1.45
1.475
1.5
1.525
1.55
1.575
1.6
1.625
1.65
1.675
1.7
1.725
1.75
1.775
1.8
1.825
1.85
© 2000 SEMTECH CORP.
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SC2422ACSTR.PDF ] | |
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