NCP1205DR2G ON Semiconductor, NCP1205DR2G Datasheet - Page 11
![IC CTRLR PWM CM OVP HV 16SOIC](/photos/5/67/56711/488-16-soic_sml.jpg)
NCP1205DR2G
Manufacturer Part Number
NCP1205DR2G
Description
IC CTRLR PWM CM OVP HV 16SOIC
Manufacturer
ON Semiconductor
Datasheet
1.NCP1205DR2.pdf
(17 pages)
Specifications of NCP1205DR2G
Output Isolation
Isolated
Frequency Range
90 ~ 125kHz
Voltage - Input
8 ~ 30 V
Operating Temperature
-25°C ~ 150°C
Package / Case
16-SOIC (0.154", 3.90mm Width)
Number Of Outputs
1
Output Current
250 mA
Mounting Style
SMD/SMT
Switching Frequency
110 KHz
Operating Supply Voltage
30 V
Maximum Operating Temperature
+ 125 C
Fall Time
30 ns
Minimum Operating Temperature
- 25 C
Rise Time
30 ns
Synchronous Pin
No
Topology
Flyback, Forward
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
NCP1205DR2G
NCP1205DR2GOSTR
NCP1205DR2GOSTR
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
NCP1205DR2G
Manufacturer:
ON/安森美
Quantity:
20 000
moves with the output power demand. The components used
for the simulation were: Vin = 300 V, Lp = 6.5 mH,
Vout = 10 V, Np/Ns = 12.
clamped. At this time, the VCO takes over and decreases the
switching frequency to the minimum value.
VCO Operation
levels above 1.0 V, the VCO frequency remains unchanged
at 125 kHz. As soon as Verr starts to decrease below 1.0 V,
If we now enter this formula into a spreadsheet, we can easily plot the switching frequency versus the output power demand:
The typical above diagram shows how the frequency
The red line indicates where the maximum frequency is
The VCO is controlled from the Verr voltage. For Verr
Figure 12. When the Power Demand goes Low, the Peak Current is Frozen and the Frequency Decreases
V
is Fixed at 130 kHz
V
can Decrease
CO
CO
Frequency
Frequency
250000
200000
150000
100000
50000
Figure 11. A Typical Behavior of Free Running Systems
with a Smooth Frequency Foldback with the NCP1205
0
0
Internal V
Fmax
V
CO
Action
err
http://onsemi.com
5
Peak Current is Fixed
OUTPUT POWER (W)
BCM Mode
Fmax
Transition
BCM to VFM
11
10
the VCO frequency decreases with a typical small- -signal
slope of - -175 kHz/mV @ Verr = 500 mV down to
zero (typically at FB 3.3 V). The demagnetization
synchronization is however kept when the Toff expands.
The maximum switching frequency can be altered by
adjusting the Ct capacitor on pin 5. The 125 kHz maximum
operation ensures that the fundamental component stays
external
specification beginning.
the idea:
The following drawing explains the philosophy behind
Peak current
can change
from
15
the
international
20
3 V
1 V
0.75 V
EMI
CISPR- -22