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PDF KTD2598 Data sheet ( Hoja de datos )

Número de pieza KTD2598
Descripción 38V/26V Step-Up LED Driver
Fabricantes Kinetic 
Logotipo Kinetic Logotipo



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No Preview Available ! KTD2598 Hoja de datos, Descripción, Manual

kinetic
technologies
KTD2598
38V/26V Step-Up LED Driver with PWM/ ExpressWireControl
Features
Wide output range: up to 10 series LEDs
Integrated 40V high current switch (0.75A
limit)
VIN: 2.7V~5.5V
High efficiency PWM converter (up to 88%)
Low 200mV feedback voltage
Single-wire interface dual method dimming:
o ExpressWire Digital Control
o PWM dimming
High accuracy across full load range
LED open-circuit (OVP) protection
o KTD2598: 38V
o KTD2598B: 26V
High switching frequency: 600kHz
Simple, small solution size
Integrated Softstart
< 1 µA shutdown current
Small TDFN22-6 Package
RoHS and Green compliant
-40 to +85 ˚C Temperature Range
Applications
LED backlighting
Mobile Phones
Handheld Devices
Digital Photo Frames
Automotive Navigation
Brief Description
KTD2598 is a versatile constant current LED driver with a
high efficiency DC-DC step up “boost” converter
architecture. The low-side power MOSFET is integrated
in the device, minimizing the total number of external
components. Unique technology and high 0.75A current
limit allow KTD2598 to drive up to 38V output (10 LEDs in
series) or up to 26V using KTD2598B (6 LEDs in series).
It can also maximize the current capability while achieving
high conversion efficiency. The optimized 600kHz
switching frequency results in reduced conduction loss
and small external component size. A single-wire
interface is integrated which can be used for PWM
dimming or ExpressWire dimming in 32 steps.
Various protection features are built into KTD2598,
including cycle-by-cycle input current limit protection, LED
open-circuit (output over voltage) protection and thermal
shutdown protection. The leakage current in shutdown
mode is less than 1µA.
KTD2598 is available in an RoHS and Green compliant 6-
lead TDFN 2x2mm package.
Typical Application
Input Range:
2.7V~5.5V
CIN
L
VIN
D1
LX
Up to 38V Output
COUT White LEDs
Up to 10 in series
Brightness Control:
ExpressWire Control or
PWM dimming
CTRL FB
COMP
GND
May 2013
Page 1
Company Confidential

1 page




KTD2598 pdf
kinetic
technologies
KTD2598
Electrical Characteristics Continued:
Symbol
Control
VTH-L
VTH-H
RCTRL
toff
tEW_DET
tEW_DELAY
tEW_WIN
tSTART
tEOS
tH_LB
tL_LB
Description
Conditions
CTRL logic low threshold
CTRL logic high
threshold
CTRL pull down resistor
CTRL pulse width to
shutdown
ExpressWire detection
time2
ExpressWire detection
delay
ExpressWire detection
window time
Start time of
programming stream
End time of
programming stream
High time low bit
Low time low bit
CTRL high to low
Logic 0
Logic 0
tH_HB
High time high bit
tL_HB
Low time high bit
VACK
Acknowledge output
voltage low
tACK_VAL
tACK
Acknowledge valid time
Duration of acknowledge
condition
fDIM
Recommended PWM
dimming frequency
Thermal Shutdown
TJ-TH
IC junction thermal
shutdown threshold
IC junction thermal
shutdown hysteresis
Logic 1
Logic 1
Open drain, 15k
pull-up from CTRL to
VIN
Note 3
Note 3
Min
1.4
300
2.5
260
100
1
2
2
2
2x
tH_LB
2x
tL_HB
2
5
Typ
600
150
15
Max Units
0.4
1200
360
180
360
360
180
0.4
2
512
100
V
V
k
ms
s
s
ms
s
s
s
s
s
s
V
s
s
kHz
C
C
Note:
1.
2.
3.
KTD2598 is guaranteed to meet performance specifications over the 40˚C to +85°C operating temperature
range by design, characterization and correlation with statistical process controls.
To select ExpressWire programming, the CTRL pin must be low for more than tEW_DET during tEW_WIN
Acknowledge condition is active 0, this condition will only be applied in case the RFA bit is set. The open drain
output requires a pull-up resistor.
May 2013
Page 5
Company Confidential

5 Page





KTD2598 arduino
kinetic
technologies
KTD2598
KTD2598’s ExpressWire programming protocol is a simple single-wire interface used to scale the FB voltage. The
interface is based on a master-slave structure, where the master is typically a microcontroller and in this case the slave is
KTD2598. The protocol consists of a device specific address byte and a data byte, shown in Figure 2 and Table 2. The
device specific address byte is factory programmed to 72 hex for KTD2598. The data byte consists of five bits for control,
two bits for register address, and one bit RFA for acknowledge. If the RFA bit is set to logic 1, it signals the Request for
Acknowledge condition. The acknowledge signal is provided via the CTRL pins open-drain output acting in bi-
directional mode, and is only given if the protocol was received correctly. The control interface can automatically detect
bit rates between 1.7kBit/sec and 160kBit/sec.
Device Address Byte
Data Byte
Data In
Start
DA7
0
DA6
1
DA5
1
DA4
1
DA3
0
DA2
0
DA1
1
DA0
0
EOS
Start
RFA
A1
A0
D4
D3
D2
D1
D0 EOS
Data Out ACK*
Figure 2, ExpressWire Protocol Overview
*Note: Ack open-drain signal is asserted if RFA bit is set high and CTRL line has a host pull-up resistor
BYTE
Device
Address
Byte
72 hex
Data byte
BIT
NUMBER
7
6
5
4
3
2
1
0
7 (MSB)
6
5
4
3
2
1
0 (LSB)
Table 2, ExpressWire Protocol Bit Description
NAME DIRECTION
DESCRIPTION
DA7 0 (MSB device address)
DA6 1
DA5 1
DA4 1
INPUT
DA3 0
DA2 0
DA1 1
DA0 0 (LSB device address)
RFA Request for acknowledge
A1 0, Register Address bit 1
A0 0, Register Address bit 0
D4 Data bit 4
INPUT
D3 Data bit 3
D2 Data bit 2
D1 Data bit 1
D0 Data bit 0
Acknowledge signal is active 0, this output signal will only
be delivered if RFA bit is set to 1. The signal is an open
ACK
OUTPUT
drain output; the host must have a pull-up resistor on this
line for proper operation. If the master is using a push-
pull output connected to this line, the acknowledge
condition will not operate properly.
May 2013
Page 11
Company Confidential

11 Page







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