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| 型号： | LM5067SDX-1 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, DSO10 |
| 封装： | LLP-10 |
| 文件页数： | 7/24页 |
| 文件大小： | 690K |
| 代理商： | LM5067SDX-1 |
30030939
FIGURE 9. Load Draws Current During Turn-On
B) Turn-on with power limit and current limit:
The power
dissipation limit in Q1 (P
FET(LIM)) is defined by the resistor at
the PWR pin, and the current sense resistor R
S. See the
Power Limit Threshold section. If the current limit threshold
(I
LIM) is higher than the current defined by the power limit
threshold at maximum V
DS (PFET(LIM)/VSYS) the circuit oper-
ates initially in power limit mode when the V
DS of Q1 is high,
and then transitions to current limit mode as the current in-
creases to I
LIM as VDS decreases. See Figure 10b. Assuming
the load (R
L) is not connected during turn-on, the time for the
output voltage to reach its final value is approximately equal
to:
For example, if V
SYS = -48V, CL = 1000 F, ILIM = 1A, and
P
FET(LIM) = 20W, tON calculates to 68 ms, and the initial cur-
rent level (I
P) is approximately 0.42A. The Fault Timeout
Period must be set longer than t
ON.
30030941
FIGURE 10. MOSFET Power Up Waveforms
15
www.national.com
LM5067
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