NCP1380CDR2G ON Semiconductor, NCP1380CDR2G Datasheet - Page 19

• Manufacturer Part Number: NCP1380CDR2G
• Description: IC PWM FLYBCK ISO CM 8SOIC
• Manufacturer: ON Semiconductor

Specifications of NCP1380CDR2G

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 65kHz
• Voltage - Supply: 9.4 V ~ 28 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 8-SOIC (3.9mm Width)
• Frequency-max: 65kHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: - 0.3 V to + 28 V
• Supply Current: +/- 30 mA
• Maximum Operating Temperature: + 125 C
• Fall Time: 25 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 40 ns
• Synchronous Pin: No
• Topology: Quasi-Resonant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Duty Cycle: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

(FB decreasing), or lower than 1.4 V (FB increasing). This
corresponds to low output power.
of his maximum value and the frequency is variable and
expands as the output power decreases.
connected to the C
constant current source and its voltage is compared to an
internal threshold (V
VCO operation occurs for FB voltage lower than 0.8 V
During VCO operation, the peak current is fixed to 17.5%
The frequency is set by the end of charge of the capacitor
Figure 36. In VCO Mode, as the Power Output Decreases, the Frequency Expands
T
pin. This capacitor is charged with a
FBth
) fixed by FB voltage (see
Figure 35. Time Out Case n52: the 3
VCO MODE OR FREQUENCY FOLDBACK
http://onsemi.com
19
Figure 27). When this capacitor voltage reaches the
threshold, the capacitor is rapidly discharged down to 0 V
and a new period start. The internal threshold is inversely
proportional to FB voltage. The relationship between V
and V
V
VCO mode at works.
rd
CT(MAX)
When V
and 4
FBth
th
is given by Equation 1.
Valley are Missing
FB
which is typically 5.5 V. Figure 36 shows the
is lower than 0.3 V, V
V
FBth
+ 6.5 * (10 3)V
FB
CT
is clamped to
(eq. 1)
FB