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参数资料
| 型号： | L5973ADTR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2.3 A SWITCHING REGULATOR, PDSO8 |
| 封装： | EXPOSED PAD, HSOP-8 |
| 文件页数： | 21/22页 |
| 文件大小： | 486K |
| 代理商： | L5973ADTR |
Functional description
L5973AD
8/22
Doc ID 9552 Rev 9
4.1
Power supply and voltage reference
The internal regulator circuit (shown in Figure 4) consists of a start-up circuit, an internal
voltage pre-regulator, the Bandgap voltage reference and the Bias block that provides
current to all the blocks.
The Starter gives the start-up currents to the whole device when the input voltage goes high
and the device is enabled (inhibit pin connected to ground).
The pre-regulator block supplies the Bandgap cell with a pre-regulated voltage VREG that
has a very low supply voltage noise sensitivity.
4.2
Voltages monitor
An internal block senses continuously the VCC, Vref and Vbg. If the voltages go higher than
their thresholds, the regulator starts to work. There is also an hysteresis on the VCC (UVLO).
Figure 4.
Internal regulator circuit
4.3
Oscillator and synchronization
Figure 5 shows the block diagram of the oscillator circuit.
The clock generator provides the switching frequency of the device that is internally fixed at
500 kHz. The frequency shifter block acts reducing the switching frequency in case of strong
overcurrent or short circuit. The clock signal is then used in the internal logic circuitry and is
the input of the ramp generator and synchronization blocks.
The ramp generator circuit provides the sawtooth signal, used to realize the PWM control
and the internal voltage feed forward, while the Synchronization circuit generates the
synchronization signal. In fact the device has a synchronization pin that can works both as
Master and Slave.
As Master to synchronize external devices to the internal switching frequency.
As Slave to synchronize itself by external signal.
STARTER
IC BIAS
PREREGULATOR
BANDGAP
VREG
VREF
D00IN1126
VCC
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| L5974AD | 功能描述:直流/直流开关调节器 2A SD switch reg BCD5 220nF 5V RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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