- 您现在的位置：买卖IC网 > PDF目录98283 > TPS54623RHLT (TEXAS INSTRUMENTS INC) 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 PDF资料下载
参数资料
| 型号： | TPS54623RHLT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 15 A SWITCHING REGULATOR, 1760 kHz SWITCHING FREQ-MAX, PQCC14 |
| 封装： | 3.50 X 3.50 MM, GREEN, PLASTIC, QFN-14 |
| 文件页数： | 9/35页 |
| 文件大小： | 1468K |
| 代理商： | TPS54623RHLT |
第1页第2页第3页第4页第5页第6页第7页第8页当前第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
SS/TR
TPS54623
EN
PWRGD
SS/TR
TPS54623
EN
PWRGD
VOUT1
VOUT 2
R1
R2
R3
R4
SLVSB09
– SEPTEMBER 2011
Figure 26. Ratiometric and Simultaneous Startup Sequence
Output Overvoltage Protection (OVP)
The device incorporates an output overvoltage protection (OVP) circuit to minimize output voltage overshoot. For
example, when the power supply output is overloaded the error amplifier compares the actual output voltage to
the internal reference voltage. If the VSENSE pin voltage is lower than the internal reference voltage for a
considerable time, the output of the error amplifier demands maximum output current. Once the condition is
removed, the regulator output rises and the error amplifier output transitions to the steady state voltage. In some
applications with small output capacitance, the power supply output voltage can respond faster than the error
amplifier. This leads to the possibility of an output overshoot. The OVP feature minimizes the overshoot by
comparing the VSENSE pin voltage to the OVP threshold. If the VSENSE pin voltage is greater than the OVP
threshold the high-side MOSFET is turned off preventing current from flowing to the output and minimizing output
overshoot. When the VSENSE voltage drops lower than the OVP threshold, the high-side MOSFET is allowed to
turn on at the next clock cycle.
Overcurrent Protection
The device is protected from overcurrent conditions by cycle-by-cycle current limiting on both the high-side
MOSFET and the low-side MOSFET.
High-side MOSFET overcurrent protection
The device implements current mode control which uses the COMP pin voltage to control the turn off of the
high-side MOSFET and the turn on of the low-side MOSFET on a cycle by cycle basis. Each cycle the switch
current and the current reference generated by the COMP pin voltage are compared, when the peak switch
current intersects the current reference the high-side switch is turned off.
Low-side MOSFET overcurrent protection
While the low-side MOSFET is turned on its conduction current is monitored by the internal circuitry. During
normal operation the low-side MOSFET sources current to the load. At the end of every clock cycle, the low-side
MOSFET sourcing current is compared to the internally set low-side sourcing current limit. If the low-side
sourcing current is exceeded the high-side MOSFET is not turned on and the low-side MOSFET stays on for the
next cycle. The high-side MOSFET is turned on again when the low-side current is below the low-side sourcing
current limit at the start of a cycle.
The low-side MOSFET may also sink current from the load. If the low-side sinking current limit is exceeded the
low-side MOSFET is turned off immediately for the rest of that clock cycle. In this scenario both MOSFETs are
off until the start of the next cycle.
Copyright
2011, Texas Instruments Incorporated
17
Product Folder Link(s) :TPS54623
相关PDF资料 |
PDF描述 |
|---|---|
| TPS54672PWPG4 | 12 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54810PWPRG4 | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54810PWPG4 | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54873PWPG4 | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| TPS54880PWPR | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS54625EVM-608 | 制造商:Texas Instruments 功能描述:TPS54625EVM-608 - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:TPS54625 EVAL MOD |
| TPS54625PWP | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC REG BUCK ADJ 6.5A 14HTSSOP 制造商:Texas Instruments 功能描述:IC SYNC STEP DOWN 650KHZ HT |
| TPS54625PWPR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.765V 1 Output 6.5A 14-TSSOP (0.173", 4.40mm Width) Exposed Pad 制造商:texas instruments 系列:D-CAP2?? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:18V 电压 - 输出（最小值/固定）:0.765V 电压 - 输出（最大值）:5.5V 电流 - 输出:6.5A 频率 - 开关:650kHz 同步整流器:是 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽）裸焊盘 供应商器件封装:14-HTSSOP 标准包装:1 |
| TPS54626EVM-608 | 制造商:Texas Instruments 功能描述:TPS54626EVM-608 - Boxed Product (Development Kits) 制造商:Texas Instruments 功能描述:TPS54626 EVAL MOD |
| TPS54626PWP | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC SYNC STEP DOWN 650KHZ HT 制造商:Texas Instruments 功能描述:18V 6.5A DCAP2 sync converter |
发布紧急采购，3分钟左右您将得到回复。