欢迎访问ic37.com |
会员登录 免费注册
发布采购

TPS61015DGS 参数 Datasheet PDF下载

TPS61015DGS图片预览
型号: TPS61015DGS
PDF下载: 下载PDF文件 查看货源
内容描述: 高效率, 1节和2节电池升压转换器 [HIGH-EFFICIENCY, 1-CELL AND 2-CELL BOOST CONVERTERS]
分类和应用: 转换器稳压器开关式稳压器或控制器电源电路电池开关式控制器光电二极管功效升压转换器
文件页数/大小: 25 页 / 452 K
品牌: TI [ TEXAS INSTRUMENTS ]
 浏览型号TPS61015DGS的Datasheet PDF文件第1页浏览型号TPS61015DGS的Datasheet PDF文件第2页浏览型号TPS61015DGS的Datasheet PDF文件第3页浏览型号TPS61015DGS的Datasheet PDF文件第4页浏览型号TPS61015DGS的Datasheet PDF文件第6页浏览型号TPS61015DGS的Datasheet PDF文件第7页浏览型号TPS61015DGS的Datasheet PDF文件第8页浏览型号TPS61015DGS的Datasheet PDF文件第9页  
TPS61010, TPS61011  
TPS61012, TPS61013  
TPS61014, TPS61015, TPS61016  
www.ti.com  
SLVS314CSEPTEMBER 2000REVISED OCTOBER 2003  
DETAILED DESCRIPTION (continued)  
Device Enable  
The device is shut down when EN is set to GND. In this mode, the regulator stops switching, all internal control  
circuitry including the low-battery comparator, is switched off, and the load is disconnected from the input (as  
described above in the synchronous rectifier section). This also means that the output voltage may drop below  
the input voltage during shutdown.  
The device is put into operation when EN is set high. During start-up of the converter, the duty cycle is limited in  
order to avoid high peak currents drawn from the battery. The limit is set internally by the current limit circuit and  
is proportional to the voltage on the COMP-pin.  
Under-Voltage Lockout  
An under-voltage lockout function prevents the device from starting up if the supply voltage on VBAT is lower  
than approximately 0.7 V. This under-voltage lockout function is implemented in order to prevent the  
malfunctioning of the converter. When in operation and the battery is being discharged, the device will  
automatically enter the shutdown mode if the voltage on VBAT drops below approximately 0.7 V.  
Autodischarge  
The autodischarge function is useful for applications where the supply voltage of a µC, µP, or memory has to be  
removed during shutdown in order to ensure a defined state of the system.  
The autodischarge function is enabled when the ADEN is set high, and is disabled when the ADEN is set to  
GND. When the autodischarge function is enabled, the output capacitor will be discharged after the device is  
shut down by setting EN to GND. The capacitors connected to the output are discharged by an integrated switch  
of 300 , hence the discharge time depends on the total output capacitance. The residual voltage on VOUT is  
less than 0.4 V after autodischarge.  
Low-Battery Detector Circuit (LBI and LBO)  
The low-battery detector circuit is typically used to supervise the battery voltage and to generate an error flag  
when the battery voltage drops below a user-set threshold voltage. The function is active only when the device is  
enabled. When the device is disabled, the LBO-pin is high impedance. The LBO-pin goes active low when the  
voltage on the LBI-pin decreases below the set threshold voltage of 500 mV ±15 mV, which is equal to the  
internal reference voltage. The battery voltage, at which the detection circuit switches, can be programmed with a  
resistive divider connected to the LBI-pin. The resistive divider scales down the battery voltage to a voltage level  
of 500 mV, which is then compared to the LBI threshold voltage. The LBI-pin has a built-in hysteresis of 10 mV.  
See the application section for more details about the programming of the LBI-threshold.  
If the low-battery detection circuit is not used, the LBI-pin should be connected to GND (or to VBAT) and the  
LBO-pin can be left unconnected. Do not let the LBI-pin float.  
Antiringing Switch  
The device integrates a circuit that removes the ringing that typically appears on the SW-node when the  
converter enters the discontinuous current mode. In this case, the current through the inductor ramps to zero and  
the integrated PMOS switch turns off to prevent a reverse current from the output capacitors back to the battery.  
Due to remaining energy that is stored in parasitic components of the semiconductors and the inductor, a ringing  
on the SW pin is induced. The integrated antiringing switch clamps this voltage internally to VBAT and therefore,  
dampens this ringing.  
Adjustable Output Voltage  
The devices with fixed output voltages are trimmed to operate with an output voltage accuracy of ±3%.  
5