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PDF LT8500 Data sheet ( Hoja de datos )
| Número de pieza | LT8500 | |
| Descripción | 48-Channel LED PWM Generator | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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LT8500
48-Channel LED PWM Generator
with 12-Bit Resolution and 50MHz
Cascadable Serial Interface
Features
n 3V to 5.5V Input Voltage
n 48 Independent PWM Outputs
n TTL/CMOS Logic 50MHz Serial Data Interface
n 12-Bit (4096 Steps) PWM Width Resolution
n 6-Bit (64 Steps) PWM Correction
(±50% of Programmed PWM Width)
n Up to 6.1kHz PWM Frequency (PWMCK = 25MHz)
n Phase-Shift Option Reduces Switching Noise
n Directly Controls Three LT3595A 16-Channel
LED Drivers
n Diagnostic Information: Sync Error/Open LED Flags
n 56-Pin (5mm × 9mm × 0.75mm) QFN Package
Applications
n Large Screen Display LED Backlighting
n Mono-, Multi-, Full-Color LED Displays
n LED Billboards and Signboards
n Motor Control
n Industrial Control
n Automated Test Equipment
n Robotics
Description
The LT®8500 is a pulse width modulation (PWM) genera-
tor with 48 independent channels. Each channel has an
individually adjustable 12-bit (4096-step) PWM register
and a 6-bit (64-step) ±50% correction register. All controls
are programmable via a simple serial data interface. Three
banks of 16-channels each can be configured such that
they operate 120° out-of-phase with each other.
The LT8500 features two diagnostic information flags:
synchronization error and open LED. The flags are sent,
with additional state information, on the serial data interface
during status read back. The 50MHz cascadable serial data
interface includes buffering and skew-balancing, making
the chip suitable for PWM intensive applications such
as large screen LCD dynamic backlighting and mono-,
multi- and full-color LED displays. The LT8500 is also
ideally suited to control three LT3595A LED drivers.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
48 PWM OUTPUTS
5-WIRE
SERIAL
DATA
INTERFACE
OSC
DIAGNOSTIC
CIRCUIT
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (1)
PWMCK
OPENLED
48 PWM OUTPUTS
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (2)
PWMCK
OPENLED
••••
••••
••••
••••
••••
48 PWM OUTPUTS
•••••
PWM[48:1]
SDI SDO
SCKI
SCK0
LDIBLANK
LT8500 (N)
PWMCK
OPENLED
8500 TA01a
8500f
1
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LT8500
Typical Performance Characteristics
Apply:
23pF
Load
on
SCKO.
PWM
Outputs
Enabled:
Duty
Cycle
=
1365/4096,
10pF
For the
Average
LICoCavdsoVnCPCWGMrasp.hs,
the
Following
Conditions
SICDCIv=s 0VMCCH,zS,CPKWI M= C0KM=Hz0,MHz
3.0
ISCDCIv=s 0VMCCH,zS,CPKWI M= C0KM=Hz1,0MHz
3.0
ISCDCIv=s 0VMCCH,zS,CPKWI M= C0KM=Hz2,5MHz
3.0
2.5 2.5 2.5
2.0 2.0 2.0
1.5 1.5 1.5
1.0 1.0 1.0
0.5 0.5 0.5
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G01
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G02
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G03
ICC vs VCC, SCKI = 12MHz,
SDI = 6MHz, PWMCK = 0MHz
30
25
20
15
10
5
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G04
ISCDCIv=s 1V0CMC,HSzC, KPIW=M2C0KM=Hz1,0MHz
30
25
20
15
10
5
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G05
SICDCIv=s 2V5CMC,HSzC, KPIW=M5C0KM=Hz2,5MHz
30
25
20
15
10
5
0
3 3.5 4 4.5 5 5.5
VCC (V)
8500 G06
VOL vs VCC
0.6
0.5
0.4
0.3
0.2
0.1
0
0
PWMs AT 3mA
SCKO, SDO AT 6mA
PWMs AT 1.8mA
123
VCC (V)
4
56
8500 G07
VOH vs VCC
0.6
0.5
0.4
0.3
0.2
0.1
0
0
PWMs AT 3mA
SCKO, SDO AT 6mA
PWMs AT 1.8mA
123
VCC (V)
4
56
8500 G08
8500f
5
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Operation
LT8500
8500f
11
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11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LT8500.PDF ] | |
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