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| 型号： | MAX17100ETM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/35页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST INT-SWITCH 48-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电源电压： | 2.5 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
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Internal-Switch Boost Regulator with Integrated Scan
Driver, VCOM Calibrator, and Op Amp for TFT LCDs
XAO Function
Once V IN drops below IN UVLO, the high-side p-chan-
nel MOSFETs of the two high-voltage switch-control
blocks will be forced to turn on regardless of YV1C_ and
TGS. In the meantime, STH_ and CKH will be pulled
high and CKBH_ will be of high-impedance state.
Fault Protection
During steady-state operation, if the output of the main
regulator or any of the linear-regulator outputs does not
exceed its respective fault-detection threshold, the
MAX17100 activates an internal fault timer. If any condi-
tion or combination of conditions indicates a continuous
fault for the fault-timer duration (218ms typ), the
MAX17100 sets the fault latch to shut down all the out-
puts and turn off the external p-channel MOSFET
(GATE is pulled high) except the reference. Once the
fault condition is removed, cycle the input voltage
(below the UVLO falling threshold) to clear the fault
latch and reactivate the device.
The MAX17100 also provides overvoltage protection for
the output of the step-up converter by monitoring the
SUP pin. During normal operation, if SUP is higher than
the threshold voltage (19V typ), the step-up converter
will stop switching and prevent excessive voltage from
damaging the MAX17100. Once SUP drops below the
threshold voltage, the step-up converter will restart and
regulate the needed output voltage.
Thermal-Overload Protection
Thermal-overload protection prevents excessive power
dissipation from overheating the MAX17100. When the
junction temperature exceeds T J = +160°C (typ), a
thermal sensor immediately activates the fault protec-
tion, which shuts down all outputs and turns off the
external p-channel MOSFET (GATE is pulled high)
except the reference, allowing the device to cool down.
Cycling the input voltage (below the UVLO falling
threshold) to clear the fault latch and reactivate the
device. The thermal-overload protection protects the
controller in the event of fault conditions. For continuous
operation, do not exceed the absolute maximum junc-
tion temperature rating of T J = +150°C.
High-Voltage Level-Shifting Scan Driver
The MAX17100 includes six independent high-voltage
level-shifting scan drivers to drive the gate lines of the
TFT panel. The driver outputs (STH1, STH2, CKH1,
CKBH1, CKH2, and CKBH2) swing between their
power-supply rails (V GHON and V GOFF ) according to the
input logic levels on the block’s inputs (ST1, ST2, CK1,
CKB1, CK2, and CKB2). The driver output is at V GOFF
when its respective input is logic-low, and at V GHON
when its respective input is logic-high. These output sig-
nals have a maximum range of +35V and -15V.
VCOM Calibrator
The VCOM calibrator is a solid-state alternative to
mechanical potentiometers used for adjusting the LCD
backplane voltage (VCOM) in TFT LCD displays. The
noninverting input of VCOM, COMADJ, is internally con-
nected to a programmable sink current source, which
sets the VCOM level (Figure 10). An internal 7-bit DAC
controls the sink current and allows the user to increase
or decrease the VCOM level by a 2-wire serial interface.
The DAC is ratiometrically relative to the SUP voltage
and is monotonic over all operating conditions. The
user stores the DAC setting in the internal nonvolatile
memory block. On power-up, the MTP presets the DAC
to the last stored setting. The 2-wire serial interface
between the system controller and the programming
circuit adjusts the DAC and programs the MTP when
WR is low. The resistive voltage-divider and the SUP
supply set the maximum value of VCOM. The sink cur-
rent from the voltage-divider reduces the COMADJ volt-
age level and VCOM output. The external resistor at
R RSET sets the full-scale sink current and the minimum
value of VCOM.
Driving Pure Capacitive Load
In general, the LCD backplane (VCOM) consists of a
distributed series capacitance and resistance, a load
that can be easily driven by the operational amplifier.
However, if the operational amplifier is used in an appli-
cation with a pure capacitive load, steps must be taken
to ensure stable operation.
As the operational amplifier’s capacitive load increases,
the amplifier’s bandwidth decreases and gain peaking
increases. A 5 ? to 50 ? small resistor placed between
OUT_ and the capacitive load reduces peaking but also
reduces the gain. An alternative method of reducing
peaking is to place a series RC network (snubber) in
parallel with the capacitive load. The RC network does
not continuously load the output or reduce the gain.
Typical values of the resistor are between 100 ? and
200 ? , and the typical value of the capacitor is 10nF.
______________________________________________________________________________________
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