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参数资料
| 型号： | TPS40304DRCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 4/31页 |
| 文件大小： | 1798K |
| 代理商： | TPS40304DRCR |
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P P
OCLOS
OUT max
DS on
OCSET
I
R
V
2
R
2
I
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SLUS964 – NOVEMBER 2009
www.ti.com
OCP sensing at LDRV is a true inductor valley current detection, using sample and hold. Equation 2 can be used
to calculate ROCSET:
(2)
where
IOCSET is the internal current source
VOCLOS is the overall offset voltage
IP-P is the peak-to-peak inductor current
RDS(on) is the drain to source on-resistance of the low-side FET
IOUT(max) is the trip point for OCP
ROCSET is the resistor used for setting the OCP level
To avoid over-current tripping in normal operating load range, calculate ROCSET using the equation above with:
The maximum RDS(ON) at room temperature
The lower limit of VOCLOS (–8 mV) and the lower limit of IOCSET (9.5 A) from the Electrical Characteristics
table.
The peak-to-peak inductor current IP-P at minimum input voltage
Overcurrent is sensed across both the low-side FET and the high-side FET. If the voltage drop across either FET
exceeds the OC threshold, a count increments one count. If no OC is detected on either FET, the fault counter
decrements by one count. If three OC pulses are summed, a fault condition is declared which cycles the
soft-start function in a hiccup mode. Hiccup mode consists of four dummy soft-start timeouts followed by a real
one if overcurrent condition is encountered during normal operation, or five dummy soft-start timeouts followed
by a real one if overcurrent condition occurs from the beginning during start. This cycle continues indefinitely until
the fault condition is removed.
Drivers
The drivers for the external high-side and low-side MOSFETs are capable of driving a gate-to-source voltage of
VBP. The LDRV driver for the low-side MOSFET switches between BP and GND, while HDRV driver for the
high-side MOSFET is referenced to SW and switches between BOOT and SW. The drivers have
non-overlapping timing that is governed by an adaptive delay circuit to minimize body diode conduction in the
synchronous rectifier.
Pre-Bias Startup
The TPS4030x contains a circuit to prevent current from being pulled from the output during startup in the
condition the output is pre-biased. There are no PWM pulses until the internal soft-start voltage rises above the
error amplifier input (FB pin), if the output is pre-biased. Once the soft-start voltage exceeds the error amplifier
input, the controller slowly initiates synchronous rectification by starting the synchronous rectifier with a narrow
on time. It then increments that on time on a cycle-by-cycle basis until it coincides with the time dictated by (1-D),
where D is the duty cycle of the converter. This approach prevents the sinking of current from a pre-biased
output, and ensures the output voltage startup and ramp to regulation is smooth and controlled.
12
Copyright 2009, Texas Instruments Incorporated
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| TPS40304DRCT | 功能描述:DC/DC 开关控制器 3-20V Wide Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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| TPS40305 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40305DRCR | 功能描述:DC/DC 开关控制器 3-20V Wide Input Sync Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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