1.产品概述 2.产品特点
3.应用范围 4.下载产品资料PDF文档
5.产品封装图 6.电路原理图
7.功能概述 8.相关产品
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一,产品概述(General Description) 需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！
五,产品封装图 (Package)
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七,功能概述
VCC and VIN Power-On-Reset (POR)
TThe CXSD62152/A keeps monitoring the voltage on VIN and VCC pins to prevent wrong logic operations which
may occur when VIN or VCC voltage is not high enough for internal control circuitry to operate. The VCC POR ris-
ing threshold is 2.7V (typical) with 0.2V hysteresis and VIN POR rising threshold is 2.3V with 0.05V hysteresis.
During startup, the VCC and VIN voltage must exceed the POR threshold. Then the IC starts a starts-up process
and ramps up the output voltage to the voltage target.
Output Under-Voltage Protection (UVP)
In the operational process, if a short-circuit occurs, the output voltage will drop quickly. Before the current-limit
circuit responds, the output voltage will fall out of the required regulation range. The under-voltage continually
monitors the FB voltage after soft-start is completed. If a load step is strong enough to pull the output voltage lower
than the under-voltage threshold, the IC shuts down converter’s output.The under-voltage threshold is 50% of the
nominal out put voltage. The under-voltage comparator has a built-in 3μs noise filter to prevent the chips from wrong
UVP shut down being caused by noise. The CXSD62152/A will be latched after under-voltage protection.
Over-Voltage Protection (OVP)
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increases over 125% of the
reference voltage due to the high-side MOSFET failure or for other reasons, the over-voltage protection comparator
will force the low-side MOSFET gate driver high till the occurence of low-side current limit. This action actively
pulls down the output voltage. As soon as the output voltage is less than 0.2V, the CXSD62152/A will be latched off
and needs a POR or enable to recover to normal operation.
Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction tempera ture of the CXSD62152/A. When the junction temperature
exceeds TJ = 160oC, a thermal sensor turns off the both power MOSFETs, allowing the devices to cool.
The thermal sensor allows the converters to start a start up process and to regulate the output voltage again after
the junction temperature cools by 50oC. The OTP is designed with a 50oC hysteresis to lower the average TJ
during continuous thermal overload conditions, increasing lifetime of the CXSD62152/A.
Current-Limit Protection
The CXSD62152/A monitors the output current, flows through the high-side and low-side power MOSFETs, and limits
the current peak at current-limit level to prevent the IC from damaging during overload, short-circuit and over-
voltage conditions. Typical high side power MOSFET current limit is 3A, and low side MOSFET current limit is 1.9A.
Soft-Start
The CXSD62152/A has a built-in soft-start to control the rise rate of the output voltage and limit the input current surge
during start-up. During soft-start, an internal voltage ramp connected to one of the positive inputs of the error
amplifier, rises up from 0V to 0.95V to replace the reference voltage (0.8V) until the voltage ramp reaches the
reference voltage. During soft-start without output overvoltage, the CXSD62152/A converter¡|s sinking capability is
disabled until the output voltage reaches the voltage target.
Soft-Stop
At the moment of shutdown controlled by EN signal, under-voltage event or over-temperature protection, theCXSD62152/A initiates a soft-stop process to discharge the output voltage in the output capacitors. Certainly, the load
current also discharges the output voltage. During softstop, the internal voltage ramp (VRAMP) falls down from 0.
95V to 0V to replace the reference voltage. Therefore, the output voltage falls down slowly at the light load. After the
soft-stop interval elapses, the soft-stop process ends and the IC turns on the low-side power MOSFET.
八,相关产品 更多同类产品.......
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Switching Regulator > Buck Converter |
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Part_No |
Package |
Architectu |
No.of PWM Outpu |
Drive Lout (A) |
Vin(V) |
Fmax Khz |
Vref (V) |
R-Top (milohm) |
R-Sync (milohm) |
Iq (No load) (uA) |
|
|
min |
max |
||||||||||
|
TQFN5x6-28 |
CM |
1 |
5 |
4.5 |
26 |
380 |
0.8 |
50 |
20 |
1000 |
|
|
SOP-8 |
CM |
1 |
2 |
4.5 |
26 |
380 |
0.8 |
100 |
1000 |
||
|
SOP-8P |
CM |
1 |
4 |
4.5 |
26 |
380 |
0.8 |
80 |
1000 |
||
|
SOT23-5|TSOT23-5 |
CM |
1 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
25 |
|
|
SOT23-5 |
CM |
1 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
||
|
SOP-8 |
CM |
1 |
3 |
4.3 |
14 |
500 |
0.8 |
70 |
70 |
500 |
|
|
SOP-8P |
CM |
1 |
3 |
4.3 |
14 |
500 |
0.8 |
55 |
45 |
500 |
|
|
TDFN3x3-10 |
3 |
2.6 |
5.5 |
2000 |
0.8 |
110 |
110 |
460 |
|||
|
TDFN3x3-10 |
CM |
2 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
500 |
|
|
TDFN3x3-10 |
CM |
2 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
||
|
TDFN2x2-6 |
CM |
1 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
25 |
|
|
TDFN2x2-6 |
CM |
1 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
||
|
TDFN3x3-12 |
CM |
2 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
25 |
|
|
TDFN3x3-12 |
CM |
2 |
1 |
2.7 |
6 |
1500 |
0.6 |
280 |
250 |
||
|
TDFN 3x3 12 |
CM |
2 |
1 |
3 |
5.5 |
1500 |
0.6 |
280 |
250 |
30 |
|
|
TQFN3x3-20 |
CM |
3 |
2 |
2.9 |
5.5 |
1500 |
0.6 |
- |
- |
300 |
|
|
TDFN2x2-8 |
CM |
1 |
1 |
3.3 |
8 |
1500 |
0.6 |
280 |
250 |
25 |
|
|
SOP-8 |
CM |
1 |
2 |
4.5 |
24 |
340 |
0.925 |
110 |
110 |
1900 |
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