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SK13 Datasheet(PDF) 9 Page - Diodes Incorporated

Part # SK13
Description  TSOT26 LIGHT LOAD IMPROVED 1.5A SYNCH DC/DC BUCK CONVERTER
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Manufacturer  DIODES [Diodes Incorporated]
Direct Link  http://www.diodes.com
Logo DIODES - Diodes Incorporated

SK13 Datasheet(HTML) 9 Page - Diodes Incorporated

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AP65101
Document number: DS38098 Rev. 2 - 3
9 of 14
www.diodes.com
December 2016
© Diodes Incorporated
AP65101
NOT RECOMMENDED FOR NEW DESIGN
Application Information (Cont.)
Current Limit and Hiccup Protection
In order to reduce the total power dissipation and to protect the application, AP65101 has cycle-by-cycle current-limiting implementation. The
voltage drop across the internal high-side MOSFET is sensed and compared with the internally set current-limit threshold. This voltage drop is
sensed at about 30ns after the HS turns on. When the peak inductor current exceeds the set current limit threshold, current limit protection is
activated. When the voltage at the FB pin reaches 0.2V the device enters Hiccup mode to periodically restart the part. This protection mode
greatly reduces the power dissipated on chip and reduces the thermal issue to protect the device. AP65101 will exit Hiccup mode when the over
current situation is resolved.
Under Voltage Lockout (UVLO)
Under voltage Lockout is implemented to prevent the IC from insufficient input voltages. The AP65101 has a UVLO comparator that monitors the
input voltage and the internal bandgap reference. If the input voltage falls below 4.4V, the AP65101 will latch the undervoltage fault. In this event,
the output will be pulled low and power has to be re-cycled to reset the UVLO fault.
Overvoltage Protection
When the AP65101 FB pin exceeds 115% of the nominal regulation voltage of 0.8V, the overvoltage comparator is tripped.
Thermal Shutdown
The AP65101 has on-chip thermal protection that prevents damage to the IC when the die temperature exceeds safe margins. It implements a
thermal sensing to monitor the operating junction temperature of the IC. Once the die temperature rises to approximately +160°C, the thermal
protection feature gets activated. The internal thermal sense circuitry turns the IC off thus preventing the power switch from damage.
A hysteresis in the thermal sense circuit allows the device to cool down to approximately +120°C before the IC is enabled again through soft start.
This thermal hysteresis feature prevents undesirable oscillations of the thermal protection circuit.
Setting the Output Voltage
The output voltage can be adjusted using an external resistor divider. Table 1 shows a list of resistor selection for common output voltages.
Resistor R1 is selected based on a design tradeoff between efficiency and output voltage accuracy. For high values of R1 there is less current
consumption in the feedback network. R1 can be determined by the following equation:
1
0.8
V
R
R
OUT
2
1
FB
R1
R2
VOUT
RT
Figure 2. Feedback Divider Network
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ)
R2 (kΩ)
RT (kΩ)
L1 (µH)
1.05
10
32.4
150
2.2
1.2
20.5
41.2
130
2.2
1.8
40.2
32.4
100
3.3
2.5
40.2
19.1
59
4.7
3.3
40.2
13
59
6.5
5
40.2
7.68
59
6.5


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