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PDF SC2449 Data sheet ( Hoja de datos )
| Número de pieza | SC2449 | |
| Descripción | BI PHASE DUAL CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SC2449
BI-Phase/Dual Controller
www.DataSheet4U.com
POWER MANAGEMENT
Description
.eatures
The SC2449 can be configured as a dual converter or a
bi-phase converter for high current applications. The part
is designed for point of use power supplies with 8.5-28V
nominal backplane power sources. Multiple supplies can
be synchronized together to prevent low frequency har-
monics on the backplane. The power dissipation is con-
trolled using a novel low voltage supply technique, allow-
ing high speed and integration, with the high drive cur-
rents to ensure low MOS.ET switching loss.
The use of high speed switching circuits allows very nar-
row PWM outputs down to 15:1 voltage ratios. Single
pin compensation for each channel simplifies develop-
ment as well as reducing external pin count.
K Selectable dual output or bi-phase operation
K Direct drive for N-channel MOS.ETs
K Undervoltage lockout
K Synchronization to external clock
K Multi-converter synchronization
K Soft start
K .ast transient response
K Max duty cycle 45%
K Output over voltage protection
K Thermal shutdown
Applications
Capable of driving MOS.ETs via external driver transis- K Power supplies for advanced telecoms/datacoms
tors for phase currents beyond 20A.
K SO IP, Ethernet and PABX power supplies
Typical Application Circuit
Revision 4, May 2002
1
www.semtech.com
1 page  
SC2449
POWER MANAGEMENT
Pin Descriptions
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Pin Pin Name Pin Function
1 FB1 Feedback for channel 1.
2 COMP1 Compensation for channel 1.
3 NC No connection.
4 BG 1V reference for error amplifiers, 3K source impedance.
5 FB2 Feedback for channel 2.
6 COMP2 Compensation for channel 2.
7 REGDRV Regulator drive for external pass transistor.
8 ENABLE Enable threshold is 2.05V, connect to ground to disable.
9 PHASE2 Phase node input for channel 2.
10 DRVH2 Gate drive for high side channel 2.
11
BSTH2
Bootstrap input for high side channel 2.
12 DRVL2 Gate drive for low side channel 2.
13
BSTL2
Supply for low side channel 2.
14
VCC
Pre-regulated IC power supply.
15
BSTL1
Supply for low side channel 1.
16 DRVL1 Gate drive for low side channel 1.
17 BSTH1 Bootstrap input for high side channel 1.
18 DRVH1 Gate drive for high side channel 1.
19 PHASE1 Phase node input for high side channel 1.
20
PGND
Power ground.
21
OC+
Overcurrent comparator inverting input.
22
OC-2
Overcurrent comparator non-inverting input for channel 2.
23
OC-1
Overcurrent comparator non-inverting input for channel 1.
24 EXTCLK External clock, converter locks to this input when a valid signal is present.
25 CLKOUT Clock out, logic level drive to provide synchronizing signal for other converters.
26 NC No connection.
27
AGND
Analog ground.
28
RREF
External reference resistor for internal oscillator and ramp generator.
2002 Semtech Corp.
5
www.semtech.com
5 Page 
POWER MANAGEMENT
Electrical Characteristic Curves (Cont.)
3.3V Channel Gate Waveform (Vin = 24V, Load Current = 18A)
SC2449
www.DataSheet4U.com
ch1: VgateH; ch2: VgateL
5.0V Channel Gate Waveform (Vin = 24V, Load Current = 12A)
2002 Semtech Corp.
ch1: VgateH; ch2: VgateL
11
www.semtech.com
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SC2449.PDF ] | |
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