参数资料
型号: L5989DTR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封装: ROHS COMPLIANT, HTSSOP-16
文件页数: 4/51页
文件大小: 1947K
代理商: L5989DTR
Functional description
L5989D
12/51
Doc ID 15778 Rev 3
5
Functional description
The L5989D is based on a voltage mode control loop. Therefore the duty ratio of the internal
switch is obtained through a comparison between a saw-tooth waveform (generated by an
oscillator) and the output voltage of the error amplifier as shown in Figure 3. The advantage
of this technique is the very short conduction time of the power elements thanks to the
proper operation of the control loop without a precise current sense, which instead is
required in current mode regulators. Thanks to this architecture the L5989D supports
extremely low conversion ratio (D = VOUT/VIN) even at very high switching frequency
(up to 1 MHz).
Figure 3.
Voltage mode control loop
The main internal blocks are represented in Figure 4.
Figure 4.
Internal block diagram
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