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NCP1512 Datasheet(PDF) 10 Page - ON Semiconductor

Part No. NCP1512
Description  PWM Buck Converter
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1512 Datasheet(HTML) 10 Page - ON Semiconductor

 
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NCP1512
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10
Vth Low
Figure 17. VCC Input Voltage versus CB
Threshold
6
5
4
3
2
VCC (V)
0.93
0.89
0.88
0.85
0.84
TA = 25°C
PWM Mode
0.87
0.86
0.92
0.91
0.90
Vth High
Figure 18. Transition Level of CB Pins
1.4
0.6
0.4
0.2
0
VCB (V)
3.0
VCC = 3.6 V
TA = 25°C
PWM Mode
2.85
1.2
1.0
0.8
Figure 19. Input Voltage versus Shutdown Voltage
Figure 20. Output Voltage versus Shutdown Pin
Voltage
6
5
4
3
2
VCC (V)
0.93
0.89
0.88
0.85
0.84
TA = 25°C
PWM Mode
1.4
0.6
0.4
0.2
0
VSHD (V)
3.0
TA = 25°C
PWM Mode
0
0.87
0.86
0.92
0.91
0.90
VSHD High
1.2
1.0
0.8
VSHD Low
VSHD
Decreasing
VSHD
Increasing
Voltage Output Selection
The CB1 and CB0 pins control the output voltage
selection. The output voltages are listed in Table 2. The CB
pins contain internal resistors to force the NCP1512 to 2.85
Vout if they are not connected to an external circuit. The
CB0 has a pull down resistor and the CB1 has a pull up
resistor. The CB Pin thresholds are fixed as noted in the
Electrical Characteristics table.
Shutdown Pin
The Shutdown Pin enables the operation of the device.
The Shutdown Pin has an internal pull down resistor to
force the NCP1512 into the off mode if this pin is floating
due to the external circuit. The Shutdown Pin threshold is
fixed as noted in the Electrical Characteristics table.
During Startup, the NCP1512 has a soft start function to
limit fast dV/dt and eliminate overshoot on the output.
Thermal Shutdown
Internal Thermal Shutdown circuitry is provided to
protect the integrated circuit in the event at the maximum
junction
temperature is exceeded. When activated,
typically at 16
0°C, the PWM latch is reset and the linear
regulator control circuitry is disabled. The thermal
shutdown circuit is designed with 2
5°C of hysteresis. This
means that the PWM latch and the regulator control
circuitry cannot be re–enabled until the die temperature
drops by this amount. This feature is provided to prevent
catastrophic failures from accidental device overheating.
It is not intended as a substitute for proper heatsinking.
The NCP1512 is contained in a 9 pin micro bump package.
Table 2. Truth Table for CB0 and CB1 with the
Corresponding Output Voltage
CB0
CB1
Vout (V)
0
0
2.5
0
1
2.85
1
1
3.0
1
0
3.3


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