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| 型号： | DS3988T+T&R |
| 厂商： | Maxim Integrated |
| 文件页数： | 13/23页 |
| 文件大小： | 0K |
| 描述： | IC CCFL CNTRLR 8CH 48TQFP |
| 标准包装： | 2,000 |
| 类型： | CCFL 控制器 |
| 频率： | 40 ~ 80 kHz |
| 电流 - 电源： | 15mA |
| 电源电压： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 48-LQFP |
| 供应商设备封装： | 48-LQFP（7x7） |
| 包装： | 带卷 (TR) |
8-Channel Cold-Cathode
Fluorescent Lamp Controller
DPWM SIGNAL
22.5Hz TO 440Hz
LAMP CURRENT
SOFT-START
SOFT-START (EXPANDED)
LAMP CYCLE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
GAn/GBn
MOSFET GATE DRIVERS
SOFT-START PROFILE REGISTER
SSP1. 0-3
SSP1. 4-7
SSP2. 0-3
SSP2. 4-7
SSP3. 0-3
SSP3. 4-7
SSP4. 0-3
SSP4. 4-7
PROGRAMMABLE SOFT-START PROFILE WITH INCREASING MOSFET PULSE WIDTHS OVER
A 16 LAMP CYCLE PERIOD RESULTS IN A LINEAR RAMP IN LAMP CURRENT.
LAMP CURRENT
Figure 6. Digital PWM Dimming and Soft-Start
DPWM Soft-Start
At the beginning of each lamp burst, the DS3988 pro-
vides a soft-start that slowly increases the MOSFET
gate-driver duty cycle (see Figure 6). This minimizes
the possibility of audible transformer noise that could
result from current surges in the transformer primary.
The soft-start length is fixed at 16 lamp cycles, but the
soft-start ramp profile is programmable through the four
Soft-Start Profile registers (SSP1/2/3/4) and can be
adjusted to match the application. There are seven dif-
ferent driver duty cycles to select from to customize the
soft-start ramp (see Table 1). The available duty cycles
range from 0% to 19% in ~3% increments. In addition,
the MOSFET duty cycle from the last lamp cycle of the
previous burst can be used as part of the soft-start
ramp by using the Most Recent Value duty-cycle code.
Each programmed MOSFET gate duty cycle repeats
twice to make up the 16 soft-start lamp cycles.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS3991 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991V | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VC | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
| DS3991VRC | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Low-Cost CCFL Controller |
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