NCP1395APG ON Semiconductor, NCP1395APG Datasheet - Page 15

• Manufacturer Part Number: NCP1395APG
• Description: IC CTRLR PWM OVP 16DIP
• Manufacturer: ON Semiconductor

Specifications of NCP1395APG

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 52%
• Voltage - Supply: 10.3 V ~ 20 V
• Buck: No
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 16-DIP (0.300", 7.62mm)
• Frequency-max: 1MHz
• Switching Frequency: 50 KHz to 1 MHz
• Mounting Style: Through Hole
• Duty Cycle (max): 52 %
• Input Voltage: 11V
• Frequency: 1MHz
• Supply Voltage Range: 20V
• Digital Ic Case Style: DIP
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC (15-Dec-2010)
• Base Number: 1395
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

•
Voltage−Controlled Oscillator
allowing an internal operation from 100 kHz up to
2.0 MHz. However, as a division by two internally creates
the two Q and Qbar outputs, the final effective signal on
The VCO section features a high−speed circuitry
Finally, Two Circuit Versions, A and B: The A and
B versions differ because of the following changes:
1. The startup thresholds are different, the A starts
to pulse for V
for V
same, however. The A is recommended for
consumer products where the designer can use
an external startup resistor, whereas the B is
Vcc
CC
= 10 V. The turn off levels are the
Rt−m sets
Fmin for V(FB) < Vfb_off
Rdt sets
the deadtime
Rt−max sets
the maximum Fsw
CC
Fmin
Fmax
DT
= 12.8 V whereas the B pulses
FB
Rfb
20 k
Vref
Vref
Figure 33. Simplified VCO Architecture
Vdd
Vdd
Vdd
Imin
Imin
Cint
http://onsemi.com
0 to I_Fmax
IDT
15
output A and B switches between 50 kHz and 1.0 MHz.
The VCO is configured in such a way that if the feedback
pin goes up, the switching frequency also goes up.
Figure 33 shows the architecture of this oscillator.
+
FBinternal
-
+
+
-
2. The A version does not activate the soft−start
more recommended for industrial/medical
applications where a 12 V auxiliary supply
directly powers the chip.
upon release of the fast fault input. This is to let
the designer implement skip cycle. To the
opposite, the B version goes back to operation
upon the fast fault pin release via a soft−start
sequence.
max
max
Fsw
Vb_fault
+
-
+
D
Clk
S
R
Q
Q
Vfb < Vb_fault
start fault timer
A
B