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参数资料
| 型号： | LT3587EUD#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件页数： | 6/24页 |
| 文件大小： | 395K |
| 代理商： | LT3587EUD#TRPBF |
LT3587
14
3587fc
APPLICATIONS INFORMATION
Output Disconnect
Both the Boost1 and the Boost3 channels have an output
disconnect between their respective CAP pin and VOUT
pin. This disconnect feature prevents a DC path from VIN
to VOUT.
For Boost1, this output disconnect feature is implemented
using a PMOS (M1) as shown in the Block Diagram in
Figure 1. When turned on, M1 is driven hard in the linear
region to reduce power dissipation when delivering cur-
rent between the CAP1 pin and the VOUT1 pin. M1 stays
on as long as the voltage difference between CAP1 and
VIN is greater than 2.5V. This allows for the positive bias
to stay high for as long as possible as the negative bias
discharges during turn off.
The disconnect transistor M1 is current limited to provide a
maximum output current of 155mA (typ). However, there is
also a protection circuit for M1 that limits the voltage drop
across CAP1 and VOUT1 to about 10V. When the voltage at
CAP1 is greater than 10V, in an overload or a short-circuit
event, M1 current is limited to 155mA until the voltage
across CAP1 to VOUT1 grows to about 10V. Then M1 is
turned on hard without any current limit to allow for the
voltage on CAP1 to discharge as fast as possible. When
the voltage across CAP1 and VOUT1 reduces to less than
10V, the output current is then again limited to 155mA.
Figure 7 shows the output voltage and current during an
overload event with VCAP1 initially at 15V.
Figure 7. VCAP1,VVOUT1, IVOUT1 and IL1 During a Short-Circuit Event
Figure 8. VCAP3, VVOUT3, IVOUT3 and IL4 During a Short-Circuit
Condition with and Without Programmed 20mA Current Limit
3587 F07
IL1
500mA/DIV
VCAP1
10V/DIV
VVOUT1
10V/DIV
IVOUT1
500mA/DIV
40μs/DIV
VVIN = 3.6V
C1 = 4.7μF
0mA
15V
3587 F08a
IL4
500mA/DIV
VCAP3
10V/DIV
VVOUT3
10V/DIV
IVOUT3
500mA/DIV
40μs/DIV
0mA
24V
3587 F08b
IL4
500mA/DIV
VCAP3
10V/DIV
VVOUT3
10V/DIV
IVOUT3
500mA/DIV
40μs/DIV
24V
0mA
VVIN = 3.6V
C4 = 1μF
The output disconnect feature on Boost3 is implemented
similarly using M3. However, in this case M3 is only turned
off when the EN/SS3 pin voltage is less than 200mV and
the Boost3 regulation loop is disabled.
The disconnect transistor M3 is also current limited, pro-
viding a maximum output current at VOUT3 of 110mA (typ).
M3 also has a similar protection circuit as M1 that limits
the voltage drop across CAP3 and VOUT3 to about 10V.
Figure 8 shows the output voltage and current during an
overload event with VCAP3 initially at 24V.
Choosing A Feedback Node
Boost1 feedback resistor, RFB1, may be connected to the
VOUT1 pin or the CAP1 pin (see Figure 9). Similarly for
Boost3 in a boost voltage regulator conguration, the
feedback resistor, RVFB3, may be connected to the VOUT3
pin or the CAP3 pin. Regulating the VOUT1 and VOUT3 pins
eliminates the output offset resulting from the voltage drop
across the output disconnect PMOS transistors.
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