參數(shù)資料
型號(hào)： L5989D
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 5.06 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： ROHS COMPLIANT, HTSSOP-16
文件頁(yè)數(shù)： 16/51頁(yè)
文件大?。?/td> 1947K
代理商： L5989D
L5989D
Functional description
Doc ID 15778 Rev 3
23/51
Figure 11.
Minimum TON
5.8
Error amplifier
The error amplifier (E/A) provides the error signal to be compared with the sawtooth to
perform the Pulse Width Modulation. Its non-inverting input is internally connected to a 0.6 V
voltage reference, while its inverting input (FB) and output (COMP) are externally available
for feedback and frequency compensation. In this device the error amplifier is a voltage
mode operational amplifier so with high DC gain and low output impedance.
The uncompensated error amplifier characteristics are the following:
In continuos conduction mode (CCM), the transfer function of the power section has two
poles due to the LC filter and one zero due to the ESR of the output capacitor. Different
kinds of compensation networks can be used depending on the ESR value of the output
capacitor. In case the zero introduced by the output capacitor helps to compensate the
double pole of the LC filter a type II compensation network can be used. Otherwise, a type
III compensation network has to be used (see Chapter 6.4 for details about the
compensation network selection).
Anyway the methodology to compensate the loop is to introduce zeros to obtain a safe
phase margin.
Table 9.
Uncompensated error amplifier
Low frequency gain
100 dB
GBWP
4.5 MHz
Slew rate
7 V/
μs
Output voltage swing
0 to 3.3 V
Maximum source/sink current
25 mA / 40 mA
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