参数资料
| 型号： | MAX8751ETJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 19/27页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR CCFL INV 32-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | CCFL 控制器 |
| 频率： | 30 ~ 80 kHz |
| 电流 - 电源： | 3.2mA |
| 电源电压： | 6 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Fixed-Frequency, Full-Bridge CCFL
Inverter Controller
Table 1. Phase-Shift Setting
PIN SETTING
PHASE SHIFT IN DEGREES
NO. OF
PHASES
PS2
PS1
MASTER
SLAVE 1
SLAVE 2
SLAVE 3
SLAVE 4
X
GND
GND
V CC
V CC
X
GND
V CC
GND
V CC
0
0
0
0
0
N/A
180
120
90
72
N/A
N/A
240
180
144
N/A
N/A
N/A
270
216
N/A
NA
N/A
N/A
288
1
2
3
4
5
X = Don’t care.
Linear Regulator Output (V CC )
The internal linear regulator steps down the DC input
voltage to 5.3V (typ). The linear regulator supplies
power to the internal control circuitry of the MAX8751.
V CC powers the MOSFET gate drivers. The V CC voltage
drops to 4.5V in shutdown.
voltage rating of the MOSFET should be 30V or higher.
The current rating of the MOSFET should be higher
than the peak primary current at the minimum input
voltage and full brightness. Use the following equation
to estimate the primary peak current I PEAK _ PRI :
UVLO
The MAX8751 includes an undervoltage lockout
(UVLO) circuit. The UVLO circuit monitors the V CC volt-
I PEAK_PRI =
2 xP OUT_MAX
V IN_MIN x η
age. When V CC is below 4.2V (typ), the MAX8751 dis-
ables both high-side and low-side gate drivers and
resets the fault latch.
Low-Power Shutdown
When the MAX8751 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.
Applications Information
MOSFETs
The MAX8751 requires four external n-channel power
MOSFETs to form a full-bridge inverter circuit to drive
the transformer primary. Since the positive half-cycle
and negative half-cycle are symmetrical, the same type
of MOSFET should be used for the high-side and low-
side switches. When selecting the MOSFET, focus on
the voltage rating, current rating, on-resistance
(R DS(ON) ), total gate charge, and power dissipation.
Select a MOSFET with a voltage rating at least 25%
higher than the maximum input voltage of the inverter.
For example, if the maximum input voltage is 24V, the
where P OUT _ MAX is the maximum output power,
V IN _ MIN is the minimum input voltage, and is the esti-
mated efficiency at the minimum input voltage.
Assuming the full bridge drives four CCFLs and the
maximum output power of each lamp is 4.5W, the total
maximum output power is 18W. If the minimum input
voltage is 8V and the estimated efficiency is 75% at
that input, the peak primary current is approximately
4.3A. Therefore, power MOSFETs with a DC current rat-
ing of 5A or greater are sufficient.
Since the regulator senses the on-state, drain-to-source
voltage of both MOSFETs to detect the transformer prima-
ry current, the lower the MOSFET R DS(ON) , the higher the
current limit is. Therefore, the user should select n-chan-
nel MOSFETs with low R DS(ON) to minimize conduction
loss, and keep the primary current limit at a reasonable
level. Use the following equation to estimate the maxi-
mum and minimum values of the primary current limit:
______________________________________________________________________________________
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| MAX8751EVKIT | 功能描述:电源管理IC开发工具 MAX8751 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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| MAX8752ETA+ | 制造商:Maxim Integrated Products 功能描述:TFT LCD DC-DC CNVRTR 8TDFN EP - Rail/Tube |
| MAX8752ETA+T | 功能描述:LCD 驱动器 TFT LCD Step-Up DC/DC Converter RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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