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参数资料
| 型号： | AS3648-ZWLT |
| 厂商： | ams |
| 文件页数： | 12/39页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR 2000MA FLASH 13WLCSP |
| 标准包装： | 10,000 |
| 恒定电压： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 频率： | 4MHz |
| 电源电压： | 2.7 V ~ 4.4 V |
| 输出电压： | 2.8 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 13-UFBGA，WLCSP |
| 供应商设备封装： | 13-WLCSP（2.25x1.5） |
| 包装： | 带卷 (TR) |
| 工作温度： | -30°C ~ 85°C |
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mum duty cycle to improve efficiency for this load condition . The DCDC converter returns back to its normal 4MHz
AS3648
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n
4MHz/1MHz Operating Mode Switching
If freq_switch_on (see page 28) =1 and in flash and assist light mode (indicator mode or low current mode using PWM
mode -see mode_setting (page 26) - always will use pulseskip) if led_current1 >=40h and led_current2 >=40h and
current_boost =0, the DCDC converter always operates in PWM mode (exception: PFM mode is allowed during
startup) to reduce EMI in EMI sensitive systems. For flash and assist light mode and high duty cycles close to 100%
on-time (maximum duty cycle) of the PMOS, the DCDC converter can switch into a 1MHz operating mode and maxi-
4
operating frequency when load or supply conditions change. Due to this switching between two fixed frequencies the
noise spectrum of the system is exactly defined and predictable. If improved efficiency is required, the fixed switching
between 1MHz / 4MHz can be disabled by freq_switch_on (see page 28) =0. In this case pulseskip will be used.
The internal circuit for switching between these two frequencies is shown in Figure 17 :
Figure 17. Internal circuit of 4MHz/1Mhz selection
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AS3648
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bit is set, which can be readout by the I C interface. The fault bits are automatically cleared by a I C readout of the fault
register. Additionally the DCDC is stopped and the current sinks are disabled by resetting out_on =0,
rises until it reaches V VOUTMAX (overvoltage condition) and the voltage across the current source is below low_vds .,
the DCDC converter is stopped, the current sources are disabled and the bit fault_ovp (see page 28) is set .
Note: For simplicity Figure 17 shows only a single current sink.
Protection and Fault Detection Functions
The protection functions protect the AS3648 and the LED(s) against physical damage. In most cases a Fault register
2 2
5
mode_setting =00 and ext_torch_on =00.
Overvoltage Protection
In case of no or a broken LED(s) at the pin LED_OUT1/2 and an enabled DCDC converter, the voltage on VOUT1/2
6
7
4. Efficiency compared to a 4MHz only DCDC converter forced to operate with minimum duty cycle.
5. Applies for all faults except TXMASK event occurred
6. If overvoltage is reached, but none of the low_vds comparator(s) triggers, VOUT1/2 is still regulated below
V VOUTMAX .
7. In constant voltage mode (5V generation, register bit const_v_mode =1) this fault is disabled.
www.austriamicrosystems.com/AS3648
1.5-4
11 - 38
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AS3648-ZWLT-500 | 功能描述:IC WHITE LED FLASH DVR 13WLCSP RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 恒定电流:- 恒定电压:- 拓扑:升压（升压），切换式电容器（充电泵） 输出数:1 内部驱动器:是 类型 - 主要:背光 类型 - 次要:白色 LED 频率:625kHz ~ 875kHz 电源电压:2.7 V ~ 5.3 V 输出电压:5V 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-µMAX 包装:带卷 (TR) 工作温度:-40°C ~ 85°C |
| AS36490FLF | 制造商:TT Electronics / IRC 功能描述:AS36490FLF |
| AS36490HLF | 制造商:TT Electronics / IRC 功能描述:AS36490HLF |
| AS36490JLF | 制造商:TT Electronics / IRC 功能描述:AS36490JLF |
| AS36491FLF | 制造商:TT Electronics / IRC 功能描述:AS36491FLF |
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