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参数资料
| 型号： | LM2631MTCX-ADJ/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | TSSOP-20 |
| 文件页数： | 10/12页 |
| 文件大小： | 265K |
| 代理商： | LM2631MTCX-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). Dur-
ing heavy load or any load with FPWM mode enabled, the
controller is in constant frequency current mode operation:
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 on until
the end of the cycle or until the inductor current reaches
zero; when this occurs, the zero cross detector will disable
the low-side driver to turn off the low-side switch. The zero
cross detector is disabled in FPWM mode.
For any peak current mode step-down converter, a compen-
sation ramp is needed to avoid subharmonic oscillations
DS100937-3
FIGURE 1. LM2631 Block Diagram
www.national.com
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