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參數(shù)資料
| 型號： | LTC4224IDDB-2#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-10 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大小： | 215K |
| 代理商： | LTC4224IDDB-2#TRPBF |
LTC4224-1/LTC4224-2
8
422412fa
APPLICATIONS INFORMATION
If the voltage across the sense resistor R1 becomes too
high, the inrush current is limited by the internal current
limit circuitry.
Turn-Off Sequence
The MOSFETs can be turned off by the conditions sum-
marized in Table 1.
Table 1. Turn-Off Conditions
CONDITION
RESULT
CHANNEL 1
CHANNEL 2
CLEARED BY
ON1 Goes High
Turns Off
No Effect
ON1 Low
ON2 Goes High
No Effect
Turns Off
ON2 Low
UVLO on VCC
Turns Off
VCC > UVLO
UVLO on VCC1
Turns Off
No Effect
VCC1 > UVLO
UVLO on VCC2
No Effect
Turns Off
VCC2 > UVLO
CH1 Overcurrent Fault
Turns Off
No Effect
ON1 High,
UVLO on VCC1
CH2 Overcurrent Fault
No Effect
Turns Off
ON2 High,
UVLO on VCC2
When ON1 or ON2 is pulled high, the corresponding GATE
pin is pulled to ground by 1.5mA. With the MOSFET off,
the load current discharges the load capacitor. Figure 4
shows VCC1 supply turning off by pulling ON1 high with
RLOAD1 = 4.7Ω discharging CLOAD1 = 150μF.
Overcurrent Fault
The LTC4224 features an adjustable current limit with circuit
breaker function that protects external MOSFETs against
short circuits or excessive load current. The voltage across
the external sense resistor is monitored by the active cur-
rent limit (ACL) amplier and the electronic circuit breaker
(ECB) comparator. An overcurrent condition results in the
current being limited by the ACL amplier. During current
limiting, the ECB is activated and initiates a chain of logic
and timing events to handle the fault.
Figure5illustratestheLTC4224’sresponsetoanovercurrent
condition on one supply output. Start-up and overcurrent
control for the two supplies are independent. Before time
point t1, the ON pin is high and the part is in reset. When
the ON pin goes low, a 10ms debounce delay is started.
After 10ms (time point t2), the external MOSFET is turned
on by charging GATE with 10μA. The load capacitor starts
to charge up and the output voltage increases. At the same
Figure 4. Normal Power-Down Sequence
Figure 5. Fault Handling Sequence
0.2ms/DIV
ON1
2V/DIV
VOUT1
5V/DIV
GATE1
5V/DIV
422412 F04
422412 F05
5ms ECB Arm
RESET
t3
t2
t1
t6
t5
t4
IDLE
OVERCURRENT 5ms
ECB BLANKING DELAY
5ms START-UP
BLANKING DELAY
10ms DEBOUNCE DELAY
ON
FAULT
VOUT
IOUT
ILIMIT
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