sc2602a Semtech Corporation, sc2602a Datasheet

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sc2602a

Manufacturer Part Number
sc2602a
Description
Synchronous Voltage Mode Controller For Distributed Power Supply Applications
Manufacturer
Semtech Corporation
Datasheet
The SC2602 and SC2602A are low-cost, full featured,
synchronous voltage-mode controllers designed for use
in single ended power supply applications where efficiency
is of primary concern. Synchronous operation allows for
the elimination of heat sinks in many applications. The
SC2602s are ideal for implementing DC/DC converters
needed to power advanced microprocessors in low cost
systems, or in distributed power applications where effi-
ciency is important. Internal level-shift, high-side drive
circuitry, and preset shoot-thru control, allows the use of
inexpensive N-channel power switches.
SC2602s features include temperature compensated
voltage reference, triangle wave oscillator and current
sense comparator circuitry. Power good signaling, shut-
down, and over voltage protection are also provided.
The SC2602 operates at a fixed 200kHz and the
SC2602A at 500kHz, providing a choice for optimum
compromise between efficiency, external component size,
and cost.
Two SC2602s can be used together to sequence power up
of telecom systems. The power good of the first SC2602
connected to the enable of the second SC2602 makes
this possible.
POWER MANAGEMENT
Revision: October 13, 2004
Description
Typical Application Circuit
Typical Distributed Power Supply
Figure 1.
OVP
PWRGD
R1
1k
+5V
0.1
R2
0.1
C1
R3
1k
0.1
MBR0520
C2
D1
1
2
3
4
5
6
7
R4
10
VCC
OVP
OCSET
PHASE
DRVH
PGND
PWRGD
SC2602
U1
SS/SHDN
SENSE
COMP
DRVL
BSTH
BSTL
GND
9
8
14
13
12
11
10
4.99K
C3
0.1
for Distributed Power Supply Applications
820pF
1.0
C4
Synchronous Voltage Mode Controller
+12V
3.9
2.2
SHDN
R5
R6
1
‹ Low cost synchronous applications
‹ Voltage Regulator Modules (VRM)
Features
Applications
Synchronous operation for high efficiency (95%)
R
On-chip power good and OVP functions
Small size with minimum external components
Soft Start
Enable function
Microprocessor core supply
DDR termination supplies
Networking power supplies
Sequenced power supplies
STP40NE
STP40NE
Q1
Q2
DS(ON)
current sensing
NOTE:
L1
2uH
*) Vout = 1.265 x (1+R8/R7)
10.0
C5
R7
127
C9
180/4V
C6
680/6.3V
SC2602/SC2602A
C10
180/4V
R8
124*
C7
680/6.3V
C11
180/4V
C8
680/6.3V
C12
180/4V
_
+
Vin
5V
C13
180/4V
www.semtech.com
Vout=2.5V
+
_
*

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sc2602a Summary of contents

Page 1

... POWER MANAGEMENT Description The SC2602 and SC2602A are low-cost, full featured, synchronous voltage-mode controllers designed for use in single ended power supply applications where efficiency is of primary concern. Synchronous operation allows for the elimination of heat sinks in many applications. The SC2602s are ideal for implementing DC/DC converters ...

Page 2

... SC2602/SC2602A ± ...

Page 3

... ° ° SC2602/SC2602A = µ ...

Page 4

... SC2602/SC2602A ...

Page 5

... FET, and DL is pulled high, turning on the low-side FET (once the cross-current con- trol allows it). 2004 Semtech Corp. SC2602/SC2602A As SENSE increases, the output voltage of the error amplifier decreases. This causes a reduction in the on- time of the high-side MOSFET connected to DH, hence lowering the output voltage ...

Page 6

... Semtech Corp. SC2602/SC2602A An over-current condition occurs when the high-side drive is turned on, but the PHASE node does not reach the voltage level set at the OCSET pin. The PHASE node is sampled only once per cycle during the valley of the tri- angular oscillator ...

Page 7

... DRVH 7 PGND DRVL 2004 Semtech Corp. D2 MBRA130 14 GND C3 SHDN 0.1 13 820pF 4.99K STP40NE 9 BSTL 1 3.9 STP40NE 8 R6 2.2 7 SC2602/SC2602A + Vin 270/16V 10.0 270/16V 270/16V 12V _ R9 205* R8 127 C9 L1 1.0 4uH D3 C10 C11 C12 C13 C14 MBRD1035 180/4V 180/4V 180/4V 180/4V ...

Page 8

... Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT 2004 Semtech Corp. SC2602/SC2602A Wave forms are shown for SC2602 and are similiar for SC2602A but at higher frequency. Gate Drive Waveforms Ch1: Top FET Ch2: Bottom FET Ch1: Top FET Ch2: Bottom FET 8 www.semtech.com ...

Page 9

... POWER MANAGEMENT Typical Characteristics (Cont.) Ch1: Vo_rpl 5V 1.3V 12A IN OUT OUT 2004 Semtech Corp. SC2602/SC2602A Ch1: Top FET Ch2: Bottom FET 9 www.semtech.com ...

Page 10

... POWER MANAGEMENT Typical Characteristics (Cont.) Hiccup Mode Start Up Mode 2004 Semtech Corp. SC2602/SC2602A Ch1: Vin Ch2: Vss Ch3: Top Gate Ch4: Vout Vin = 5V Vout = 3.3V Vbst = 12V Iout = S.C. Iout = S.C. Iout = S.C. Iout = S.C. Iout = S.C. Ch1: Vin Ch2: Vss Ch3: Top Gate Ch4: Vout Vin = 5V Vout = 3 ...

Page 11

... POWER MANAGEMENT Typical Characteristics (Cont.) Math Cad Close Loop Stability Analysis Output Filter Schematic: 2004 Semtech Corp. SC2602/SC2602A 11 www.semtech.com ...

Page 12

... POWER MANAGEMENT Typical Characteristics (Cont.) Error Amplifier Schematic 2004 Semtech Corp. SC2602/SC2602A 12 www.semtech.com ...

Page 13

... POWER MANAGEMENT Typical Characteristics (Cont.) 2004 Semtech Corp. SC2602/SC2602A 13 www.semtech.com ...

Page 14

... POWER MANAGEMENT Typical Characteristics (Cont.) 2004 Semtech Corp. SC2602/SC2602A 14 www.semtech.com ...

Page 15

... POWER MANAGEMENT Evaluation Board Schematic 2004 Semtech Corp. SC2602/SC2602A 15 www.semtech.com ...

Page 16

... C A-B D GAGE PLANE 0.25 A SEE DETAIL DETAIL AND - DETERMINED AT DATUM PLANE -H- DIM INCHES (.205 Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 16 SC2602/SC2602A DIMENSIONS MILLIMETERS MAX MIN NOM MAX - - .069 1.35 1. .010 0.10 0. .065 1.25 1. .020 0.31 0. ...

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