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參數(shù)資料
| 型號(hào)： | LM2631MTC-ADJ/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | TSSOP-20 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大小： | 683K |
| 代理商： | LM2631MTC-ADJ/NOPB |
Block Diagram
Operation
BASIC OPERATION OF THE CURRENT MODE
CONTROLLED SWITCHING REGULATOR
The main control loop includes the error amplifier, the current
amplifier and PWM comparator (as shown in Figure 1).
During heavy load or any load with FPWM mode enabled,
the controller is in constant frequency current mode opera-
tion: the high-side switch is turned on at the beginning of
each clock cycle, and the output of the error amplifier is
compared with the sensed inductor current ramp; once the
ramp reaches the control level set by the error amplifier, the
PWM comparator reset the driver logic to turn off the high-
side switch; the low-side switch is turned on after certain
delay (the voltage at the SW pin is sensed and the low-side
switch is turned on once the SW pin voltage reaches zero. A
preset maximum delay is 100 ns). The low-side switch stays
10093703
FIGURE 1. LM2631 Block Diagram
LM2631
www.national.com
7
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