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参数资料
| 型号： | MAX8798EVCMAXQU+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/31页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL FOR MAX8798 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | 特殊用途 DC/DC，LCD 电源 |
| 输出及类型： | 4，非隔离 |
| 功率 - 输出： | 3.56W |
| 输出电压： | 8V，3.2V，21V，-13V |
| 电流 - 输出： | 300mA，150mA，20mA，20mA |
| 输入电压： | 1.8 ~ 6 V |
| 稳压器拓扑结构： | 升压 |
| 频率 - 开关： | 1.2MHz |
| 板类型： | 完全填充 |
| 已供物品： | 2 板，CD |
| 已用 IC / 零件： | MAX8798 |
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Internal-Switch Boost Regulator with
Integrated 3-Channel Scan Driver for TFT LCDs
Figure 4 shows the block diagram of the step-up regu-
lator. An error amplifier compares the signal at FB to
1.24V and changes the COMP output. The voltage at
COMP determines the current trip point each time the
internal MOSFET turns on. As the load varies, the error
amplifier sources or sinks current to the COMP output
accordingly to produce the inductor peak current nec-
essary to service the load. To maintain stability at high
duty cycles, a slope-compensation signal is summed
with the current-sense signal.
On the rising edge of the internal clock, the controller
sets a flip-flop, turning on the n-channel MOSFET and
applying the input voltage across the inductor. The cur-
rent through the inductor ramps up linearly, storing
energy in its magnetic field. Once the sum of the cur-
rent-feedback signal and the slope compensation
exceed the COMP voltage, the controller resets the flip-
flop and turns off the MOSFET. Since the inductor cur-
rent is continuous, a transverse potential develops
across the inductor that turns on the diode (D1). The
CLOCK
voltage across the inductor then becomes the differ-
ence between the output voltage and the input voltage.
This discharge condition forces the current through the
inductor to ramp back down, transferring the energy
stored in the magnetic field to the output capacitor and
the load. The MOSFET remains off for the rest of the
clock cycle.
Undervoltage Lockout (UVLO)
The undervoltage lockout (UVLO) circuit compares the
input voltage at IN with the UVLO threshold (1.3V rising
and 1.2V falling) to ensure that the input voltage is high
enough for reliable operation. The 100mV (typ) hystere-
sis prevents supply transients from causing a restart.
Once the input voltage exceeds the UVLO rising
threshold, startup begins. When the input voltage falls
below the UVLO falling threshold, the controller turns
off the main step-up regulator and the linear regulator,
disables the switch-control block, and the operational
amplifier output becomes high impedance.
LX
LOGIC AND DRIVER
PGND
ILIM
COMPARATOR
1.2MHz
OSCILLATOR
SLOPE COMP
PWM
COMPARATOR
SOFT-
START
I LIMIT
CURRENT
SENSE
TO FAULT LOGIC
FAULT
COMPARATOR
1.0V
ERROR AMP
1.24V
FB
COMP
Figure 4. Step-Up Regulator Block Diagram
18
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相关代理商/技术参数 |
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|---|---|
| MAX8798EVCMAXQU+ | 功能描述:显示开发工具 MAX8798 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX8798EVKIT+ | 功能描述:显示开发工具 MAX8798 Eval Kit RoHS:否 制造商:4D Systems 产品:4Display Shields 工具用于评估:?OLED-160-G1, ?OLED-160-G2 接口类型:Serial 工作电源电压:5 V |
| MAX8799EVKIT+ | 制造商:Maxim Integrated Products 功能描述:SINGLE-PHASE AMD CPU - Boxed Product (Development Kits) |
| MAX8799GTI+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX8799GTI+ VOLTAGE REFERENCES - Rail/Tube 制造商:Maxim Integrated Products 功能描述:SINGLE-PHASE AMD CPU - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Maxim MAX8799GTI+ Voltage References |
| MAX8799GTI+T | 制造商:Maxim Integrated Products 功能描述:SINGLE-PHASE AMD CPU - Tape and Reel |
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