参数资料
型号: MIC2182-5.0YM TR
厂商: Micrel Inc
文件页数: 12/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 16-SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 330kHz
占空比: 86%
电源电压: 4.5 V ~ 32 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
其它名称: MIC2182-5.0YMTR
MIC2182-5.0YMTR-ND
MIC2182
V SW
V IN
0V
Micrel
I L1
Reset
Pulse
I LOAD
0A
V DD
0V
V IN + V DD
V HSD
0V
V LSD
V HSD
V LSD
V SW
V DD
0V
V DD
0V
V DD
0V
V IN
V OUT
Figure 5a. PWM-Mode Timing
0V
I LIM(skip)
I L1
0A
V NOMINAL
V one-shot
V OUT
I OUT
V DD
0V
+1%
– 1%
0V
0A
Figure 5b. Skip-Mode Timing
A hysteretic comparator is used in place of the PWM error
amplifier and a current-limit comparator senses the inductor
current. A one-shot starts the switching cycle by momentarily
turning on the low side MOSFET to insure the high-side drive
boost capacitor, Cbst, is fully charged. The high-side MOS-
Figure 6 shows the improvement in efficiency that skip mode
makes when at lower output currents.
100
PWM
80
FET is turned on and current ramps up in the inductor, L1.
The high-side drive is turned off when either the peak voltage
on the input of the current-sense comparator exceeds the
threshold, typically 35mV, or the output voltage rises above
the hysteretic threshold of the output voltage comparator.
60
40
20
Skip
Once the high-side MOSFET is turned off, the load current
discharges the output capacitor, causing V OUT to fall. The
cycle repeats when V OUT falls below the lower threshold, –
1%.
The maximum peak inductor current depends on the skip-
mode current-limit threshold and the value of the current-
sense resistor, R CS .
35mV
I inductor(peak) =
R sense
M9999-042204
12
0
0.01 0.1 1 10
OUTPUT CURRENT (A)
Figure 6. Efficiency
100
April 22, 2004
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