SC531 SEMTECH [Semtech Corporation], SC531 Datasheet

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SC531

Manufacturer Part Number
SC531
Description
Triple Low-side FET Driver with Digitally Controlled Current Limit
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
POWER MANAGEMENT
Features
Applications
Typical Application Circuit
Rev 2.0
Dual 2A Source, 4A Sink FET Drivers
Second Channel Enable
Independent Drive Supplies
Auxiliary 2A Source, 4A Sink FET Driver
Precision Reference Output
Current Limit Reference Output (Analog) Integrated
Current Sense Blanking (Digital Input)
Digitally Controlled High Precision Current Limit
Current Limit Flag
Current Input ZVS Comparator
SPI Communications — 25 MHz
Thermally Enhanced 4x4 (mm) MLPQ-UT-28 Package
Lead-free, Halogen free, and RoHS/WEEE compliant
Digitally Controlled Power Supplies
Flyback Converter
Boost Converter
Forward Converter
DC-DC and AC-DC Converters With Active Clamp
PFC Converters With ZVT
Constant Current Converter
Interface
DAC
8-bit
SPI
HV
3.3V
IN
47nF
1µF
IN
OE2B
DIN
CLK
DAC
BLANKB
ZVS
IN3
A0
CSB
VREFH
VREF
VREFL
SC531
GND
VCC
CSENSE
PGND1
PGND2
PGND3
PVDD1
PVDD2
PVDD3
© Semtech Corporation
ZVSN
ZVSP
OUT1
OUT2
OUT3
CLF
1µF
1µF
1µF
C
IN
1MW
1MW
Digitally Controlled Current Limit
Description
The SC53 combines three low side drivers with a high
speed digitally programmable current limit and a zero
voltage switching (ZVS) comparator. Two drivers are nor-
mally used to operate the FETs for the power stage. They
can operate separately to drive individual power FETs or
can be combined to drive a single device. A third, auxil-
iary, gate drive is controlled by an independent input and
can be used to drive the FET for an active clamp or ZVT
switching. All three drivers have an independent supply
which allows each drive voltage to be optimized for high
efficiency.
In addition, the SC53 has an SPI interface, 8-bit DAC, and
current limit comparator to provide a high-speed digitally
programmable current limit. This circuitry can be used for
cycle by cycle current limiting or current waveform
shaping. A digital output current limit flag is available for
monitoring by the host controller.
The SC53 also has a current-input ZVS comparator that
can be used to sense changes in high voltage nodes, such
as the power FET drain and inductor node (LX) versus the
power stage supply, (HV
circuit).
Triple Low-side FET Driver with
9V
9V
9V
Q1
T1
Q2
15pF
1kW
D1
D2
Q3
C3
IN
in the typical application
2.49W
200W*
C
*optional
OUT
180pF*
V
V
OP
ON
SC531


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SC531 Summary of contents

Page 1

... OUT1 DIN PGND1 CSB PVDD2 9V CLK 1µF OUT2 DAC PGND2 VREFH 9V PVDD3 1µF VREF OUT3 PGND3 VREFL BLANKB CLF GND CSENSE © Semtech Corporation SC531 in the typical application 15pF OUT 200W* 1kW 2.49W 180pF* *optional ...

Page 2

... PGND3 6 T OUT3 TOP VIEW MLPQ-UT-28; 4x4, 28 LEAD θ = 32.5°C/W JA Marking Information SC531 yyww XXXXX XXXXX yyww = Date Code XXXXX = Semtech Lot Number XXXXX = Semtech Lot Number Ordering Information Device SC53ULTRT 23 22 SC53EVB Notes: CSB 21 () Available in tape and reel only. A reel contains 3,000 devices. ...

Page 3

... PVDD rising: UVLO sensing on PVDD only ENABLE PV UVLO sensing on PVDD only HYS V rising UVLO(TH falling UVLO(HYS IN, DIN, CSB, CLK, A0, IN3, OE2B IH V IN, DIN, CSB, CLK, A0, IN3, OE2B IL V IH_BLNK V IL_BLNK SC531 < + (°C/ ( 2V 3.5V to 3.46V, bypass capaci Min Typ Max .5 2.5 2.2 3.5 0.8 .4 4.25 4.5 4 ...

Page 4

Electrical Characteristics (continued) Parameter Symbol Digital Section (continued) Digital Output High Digital Output Low BLANKB pull-up resistance SPI CLK Frequency SPI CLK High & Low Time CSB, DIN to Clock Falling Edge Setup and Hold Time Chip Select Reset Time ...

Page 5

... PROP3 PVDD = 8V, COUT =  ,2,3 I 0mA < Input current < 40mA ZVS V 0mA < Input current < 40mA ZVS 0mA<Input Current< 40mA, 5mA overdrive ZVS_falling 0mA<Input Current< 40mA, 0mA overdrive ZVS_rising SC531 Min Typ Max Units 00 ns 800 kHz - μA ...

Page 6

... Driver 2 supply voltage. Connect a 2.2uF bypass capacitor from PVDD2 Power input to PGND2. Driver  supply voltage. Connect a 2.2uF bypass capacitor from PVDD Power input to PGND2. Power output Driver  output GROUND Driver  power ground GROUND Connected to GND, use multiple thermal vias for heatsinking purposes SC531 6 ...

Page 7

Block Diagram 10 IN Ref. Bufffer 3R VREFH 17 14 VREF VCC 4 19 DIN 21 CSB SPI 20 CLK Interface A0 1 GND 18 13 DAC VREFL 15 16 CSENSE 11 BLANKB 5 ZVS IN3 ...

Page 8

... OUT1, OUT2 Fall Time VCC = 3.3V, PVDD/2/3 = 7.8V, Load = BSC90N5NS3G IN (2V/div) OUT (5V/div) OUT2 (5V/div) OE2B (V/div) Time (40ns/div) OUT3 Fall Time VCC = 3.3V, PVDD/2/3 = 7.8V, Load = BSC90N5NS3G IN (2V/div) OUT3 (5V/div) Time (40ns/div) SPI to DAC Response Time VCC = 3.3V, PVDD/2/3 = 7.8V DAC (00mV/div) CLK (5V/div) LX (50V/div) Time (4µs/div) SC531 8 ...

Page 9

... The ZVSP and ZVSN pins can vary from 2-4V based on this normal input current range. The ZVSN and ZSVP input pins can tolerate currents up to 300μA, but the accuracy and speed specifications are only valid in the 0-40μA range. SC531 . The ...

Page 10

... CSENSE pin and connected to GND, and connected to the IC with short direct traces. Any VREFH, VREFL, or VREF bypass capacitors should be placed close to the pins, routed with direct traces, and connected to GND. and R , and Z Z2 SC531 F minimum capacitor for all bypassing. μ 0 ...

Page 11

... VREF OUT3 VREFL PGND3 BLANKB CLF GND CSENSE 10M VAC_IN 20k 1µF VCC ZVS R Z1 250k IN ZVSN OE2B SC531 ZVSP IN3 PVDD1 A0 1µF OUT1 DIN PGND1 CSB PVDD2 1µF CLK OUT2 DAC PGND2 VREFH PVDD3 1µF VREF OUT3 PGND3 ...

Page 12

Applications Information (continued) SCLK t CSB D IN MSB 1 SPI SH CSB / / DB15 / / t SH Figure 3 — Serial ...

Page 13

... MIN NOM MAX MIN NOM MAX - - A .020 .024 0.50 0. .000 .001 0.00 0.02 (.006) (0.152 .006 .008 .010 0.15 0.20 0.25 D .154 .157 .161 3.90 4.00 4.10 D1 .100 .104 .108 2.55 2.65 2.75 E .154 .157 .161 3.90 4.00 4.10 E1 .100 .104 .108 2.55 2.65 2.75 e .016 BSC 0.40 BSC L .012 .016 .020 0.30 0.40 0. aaa .003 0.08 bbb .004 0. SC531 3 ...

Page 14

Land Pattern – 4x4 MLPQ-UT28 K ( NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. ...

Page 15

... Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 9302 Phone: (805) 498-2 Fax: (805) 498-3804 www.semtech.com SC531 5 ...

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