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參數(shù)資料
| 型號： | MAX8729 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Constant-Frequency, Half-Bridge CCFL Inverter Controller |
| 中文描述： | 固定頻率、半橋CCFL逆變控制器 |
| 文件頁數(shù)： | 19/26頁 |
| 文件大?。?/td> | 395K |
| 代理商： | MAX8729 |
M
Constant-Frequency, Half-Bridge CCFL
Inverter Controller
______________________________________________________________________________________
19
the slave IC. To synchronize the DPWM frequency,
connect the LFCK pins of the slave IC and master IC
together, and connect the DPWM pin of the master IC
to the LF pin of the slave IC. The CNTL brightness con-
trol is disabled in the slave mode. The master directly
controls the brightness setting of the slave by providing
a dimming signal on its DPWM pin.
Phase Shift in Daisy-Chain Operation
(PS1, PS2)
The MAX8729 has the capability to adjust the phase of
the gate drivers and the DPWM oscillator. The phase-
shift function significantly reduces the input RMS ripple
current and lowers the input capacitor requirement. The
phase shift can be easily programmed using two logic
input pins (PS1 and PS2). These two pins combined
together give four choices of phase shift: 72°, 90°, 120°,
and 180°. The selection of the phase shift is based on
the number of MAX8729s used in the daisy-chain.
Table 1 gives the suggested selection of phase shift for
1, 2, 3, 4, and 5 phases. For a given multiphase circuit,
all master and slave ICs should use the same setting
for PS1, PS2.
Table 2 summarizes the MAX8729’s operation in
all modes.
Linear Regulator Output (V
CC
)
The internal linear regulator steps down the DC input volt-
age to 5.35V (typ). The linear regulator supplies power to
the internal control circuitry of the MAX8729. V
CC
can be
used to power the MOSFET gate drivers by connecting it
to V
DD
. V
DD
can also be driven from an external supply.
The V
CC
voltage drops to 4.5V in shutdown.
UVLO
The MAX8729 includes an undervoltage lockout
(UVLO) circuit. The UVLO circuit monitors the V
CC
volt-
age. When V
CC
is below 4.2V (typ), the MAX8729 dis-
ables both high-side and low-side gate drivers and
resets the fault latch.
Low-Power Shutdown
When the MAX8729 is placed in shutdown, all functions
of the IC are turned off except for the 5.3V linear regu-
lator. In shutdown, the linear regulator output voltage
drops to about 4.5V and the supply current is 6μA (typ).
While in shutdown, the fault latch is reset. The device
can be placed into shutdown by pulling
SHDN
to its
logic low level.
Table 1 Phase Shift Setting
PIN SETTING
PS2
X
GND
GND
V
CC
V
CC
PHASE SHIFT IN DEGREES
SLAVE 1
SLAVE 2
N/A
180
120
90
72
PS1
X
GND
V
CC
GND
V
CC
MASTER
0
0
0
0
0
SLAVE 3
N/A
N/A
N/A
270
216
SLAVE 4
N/A
NA
N/A
N/A
288
NO. OF
PHASES
N/A
N/A
240
180
144
1
2
3
4
5
X = Don’t care.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8729EEI | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8729EEI+ | 功能描述:顯示驅(qū)動器和控制器 Const-f Half-Bridge CCFL Inverter Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8729EEI+T | 功能描述:顯示驅(qū)動器和控制器 Const-f Half-Bridge CCFL Inverter Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8729EEI-T | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX8729EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX8729 Eval Kit RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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