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PDF ( 数据手册 , 数据表 ) IW7032

零件编号 IW7032
描述 32-Channel LED Driver
制造商 iWatt
LOGO iWatt LOGO 


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IW7032 数据手册, 描述, 功能
iW7032
32-Channel LED Driver for LCD Panel Backlighting
1.0  Features
● Fully integrated power FET with minimum external
components
● Proprietary digital power management and patented
adaptive switch mode LED driver
● 32-channel output each at 56 V with 9 V to 28 V input
supply voltage range
● Dynamic external Boost or Buck controller interface to
optimize system power efficiency
● Serial Peripheral Interface (SPI) compatible for high
bandwidth PWM-based dynamic local dimming
● Per channel current up to 120 mA average current,
with non-adaptive-switch peak current of 120 mA for
local dimming and 192 mA for scanning mode, and with
adaptive-switch peak current up to 60% higher.
● LED failure (open and short-circuit) detection
● LED brightness local dimming, scanning, and 3D game
mode controlled by SPI interface
● PWM dimming range from 1% to 99.9% with 10-bit
resolution
● Vsync synchronized PWM
● PWM dimming frequency from 120Hz to 2.4 kHz in
NTSC; 100Hz to 2.4kHz in PAL; and 96Hz to 2.4kHz
in 3D game mode with 5-bit programmability in normal
mode.
● Over-temperature protection
● UVLO protection
● Green & Pb-free (RoHS compliant) BOM
2.0  Description
The iW7032 is a high efficiency driver for LEDs. It is designed
for use with mid- to large size LCD panels that use arrays
of LEDs as a backlight source. It is able to communicate
with up to two external step-up or step-down PWM DC-DC
converters to drive up to 32 separate strings of multiple
series-connected LEDs.
The iW7032 features dynamic output voltage control, which
automatically chooses the lowest active LED source voltage
to regulate the feedback voltage of a step-up or step-down
converter. Through this function, the iW7032 is able to
dynamically adjust the output voltage of up to two external
step-up or step-down converters to optimize the system
power efficiency.
The iW7032 also provides 32 constant current sinks with
maximum ±2% current matching. The LED PWM dimming
can be adjusted dynamically through a high bandwidth SPI
interface, which provides users flexibility to control the light
intensity of LEDs. In addition, users can provide versatile
configurations of the iW7032 through SPI interface registers.
The iW7032 can maintain very high efficiency even with the
existence of LED channel total forward voltage mismatch,
with the proprietary digital power management and patent
pending adaptive switch mode LED current regulation
technology.
The iW7032 has multiple features to protect the LED
channels from fault conditions, and these protections are
LED PWM cycle-by-cycle based to ensure system reliability
and provide consistent operation.
iW7032 is available in a low-profile, space-saving thermally
enhanced 10mm x 10mm TQFP-EP package.
3.0  Applications
● Edgelit Local Dimming for LED TV Backlit
● Direct & Segment-Edge LED Backlit LCDTV
● LCD Public Information Displays
Rev. 1.3
iW7032
Page 1







IW7032 pdf, 数据表
iW7032
32-Channel LED Driver for LCD Panel Backlighting
8.0  Functional Block Diagram
EPGND
GND1
FB1
LED00
LED01
LED02
LED03
EPGND
EPGND
LED04
LED05
LED06
LED07
EN
LDO5
LDO3
8 LED Drivers
DC-DC
1 Determinator
& DAC
2
3 VSYNC
4
Bandgap References
& Current Sources
Oscillator
5
6
7
8
9
Digital Sub-Module
10
11
12
13
14
15
16
5 V LDO +
3.3V LDO
DC-DC
Determinator
& DAC
48 EPGND
47 SYNCLK
46 XO
45 LED23
44 LED22
43 LED21
42 LED20
41 EPGND
40 EPGND
39 LED19
38 LED18
37 LED17
36 LED16
35 FB2
34 GND2
33 CSB
8 LED Drivers
Digital I/O
SPI Interface
Rev. 1.3
Figure 8.1.  iW7032 Functional Block Diagram
Digital_top
SPI Slaver +
Register
Startup
Controller
Fault
Detection
OTF
Adjustment
PWM
Controller
Testability
Control and Status
Interface
Testability Interface
Figure 8.2.  Digital Sub-module Functional Block Diagram
iW7032
Page 8







IW7032 equivalent, schematic
iW7032
32-Channel LED Driver for LCD Panel Backlighting
12.0  Control Register Table
Due to the PWM resolution of the 10 bits, all the control registers are based on a 10-bit address and data scheme.
12.1  Control Register Mapping Table
Address Bit9 Bit8 Bit7
Real-Time Update Control Registers (Frame based)
0x000
Dim_mode
Bit6
0x001
Bri1[9]
Bri1[8]
Bri1[7]
Bri1[6]
0x002
Bri2[9]
Bri2[8]
Bri2[7]
Bri2[6]
: ::
0x01f
Bri31[9]
Bri31[8]
Bri31[7]
Bri31[6]
0x020
Bri32[9]
Bri32[8]
Bri32[7]
Bri32[6]
Address 0x041-0x04f (Reserved)
Real-Time Update Control Registers (User Operation Mode based)
0x050
Tv_
mode[1]
Tv_
mode[0]
Scan_
duty[4]
0x051
0x052
0x053
0x054
0x055
0x056
0x057
:
:
0x092
0x093
Td0[9]
Td0[8]
Td0[7]
Td0[6]
Td_dg1[9] Td_dg1[8] Td_dg1[7] Td_dg1[6]
Td_dg2[9] Td_dg2[8] Td_dg2[7] Td_dg2[6]
:
:
Td_dg32[9]
:
:
Td_dg32[8]
:
:
Td_dg32[7]
:
:
Td_dg32[6]
::::
::::
0x129
Ld_vdac_ld Vdac_ld[7]
0x12a
L d _ v d a c _ Vdac_sc[7]
sc
Address 0x093-0x09f (Reserved)
:
:
Vdac_ld[6]
Vdac_sc[6]
Bit5
Bri1[5]
Bri2[5]
:
Bri31[5]
Bri32[5]
Scan_
duty[3]
Td0[5]
Td_dg1[5]
Td_dg2[5]
:
:
Td_dg32[5]
:
:
Vdac_ld[5]
Vdac_sc[5]
Bit4
Bri1[4]
Bri2[4]
:
Bri31[4]
Bri32[4]
Scan_
duty[2]
Pwm_
freq[4]
Td0[4]
Td_dg1[4]
Td_dg1[14]
Td_dg2[4]
Td_dg2[14]
:
:
Td_dg32[4]
Td_
dg32[14]
:
:
Vdac_ld[4]
Vdac_sc[4]
Bit3
Temp_trk_
en
Bri1[3]
Bri2[3]
:
Bri31[3]
Bri32[3]
Scan_
duty[1]
Pwm_
freq[3]
Td0[3]
Td0[13]
Td_dg1[3]
Td_dg1[13]
Td_dg2[3]
Td_dg2[13]
:
:
Td_dg32[3]
Td_
dg32[13]
:
:
Vdac_ld[3]
Vdac_sc[3]
Bit2
Led_temp_
comp[2]
Bri1[2]
Bri2[2]
:
Bri31[2]
Bri32[2]
Scan_
duty[0]
Pwm_
freq[2]
Td0[2]
Td0[12]
Td_dg1[2]
Td_dg1[12]
Td_dg2[2]
Td_dg2[12]
:
:
Td_dg32[2]
Td_
dg32[12]
:
:
Vdac_ld[2]
Vdac_sc[2]
Bit1
Led_temp_
comp[1]
Bri1[1]
Bri2[1]
:
Bri31[1]
Bri32[1]
SVsync_
cfg[1]
Pwm_
freq[1]
Td0[1]
Td0[11]
Td_dg1[1]
Td_dg1[11]
Td_dg2[1]
Td_dg2[11]
:
:
Td_dg32[1]
Td_
dg32[11]
:
:
Vdac_ld[1]
Vdac_sc[1]
Bit0
Led_temp_
comp[0]
Bri1[0]
Bri2[0]
:
Bri31[0]
Bri32[0]
SVsync_
cfg[0]
Pwm_
freq[0]
Td0[0]
Td0[10]
Td_dg1[0]
Td_dg1[10]
Td_dg2[0]
Td_dg2[10]
:
:
Td_dg32[0]
Td_
dg32[10]
:
:
Vdac_ld[0]
Vdac_sc[0]
Rev. 1.3
iW7032
Page 16










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