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NCP1247AD100R2G Datasheet(PDF) 6 Page - ON Semiconductor

Part # NCP1247AD100R2G
Description  Fixed Frequency Current Mode Controller for Flyback Converters
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1247AD100R2G Datasheet(HTML) 6 Page - ON Semiconductor

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ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, for min/max values TJ = −40°C to +125°C, VHV = 125 V,
VCC = 11 V unless otherwise noted)
Characteristics
Unit
Max
Typ
Min
Symbol
Test Condition
OSCILLATOR
Maximum on time
fOSC = 65 kHz
fOSC = 100 kHz
tONmax(65kHz)
tONmax(100kHz)
11.3
7.4
12.3
8.0
13.1
8.5
ms
Maximum duty cycle (corresponding to
maximum on time at maximum switching
frequency)
fOSC = 65 kHz
fOSC = 100 kHz
DMAX
80
%
Frequency jittering amplitude, in percentage
of FOSC
Ajitter
±4
±6
±8
%
Frequency jittering modulation frequency
Fjitter
85
125
165
Hz
FREQUENCY FOLDBACK
Feedback voltage threshold below which
frequency foldback starts
VFB(foldS)
1.8
2.0
2.2
V
Feedback voltage threshold below which
frequency foldback is complete
VFB(foldE)
0.8
0.9
1.0
V
Minimum switching frequency
VFB = Vskip(in) + 0.1
fOSC(min)
23
27
32
kHz
OUTPUT DRIVER
Rise time, 10% to 90% of VCC
VCC = VCC(min) + 0.2 V,
CDRV = 1 nF
trise
40
70
ns
Fall time, 90% to 10% of VCC
VCC = VCC(min) + 0.2 V,
CDRV = 1 nF
tfall
40
70
ns
Current capability
VCC = VCC(min) + 0.2 V,
CDRV = 1 nF
DRV high, VDRV = 0 V
DRV low, VDRV = VCC
IDRV(source)
IDRV(sink)
500
800
mA
Clamping voltage (maximum gate voltage)
VCC = VCCmax – 0.2 V, DRV high,
RDRV = 33 kW, Cload = 220 pF
VDRV(clamp)
11
13.5
16
V
High−state voltage drop
VCC = VCC(min) + 0.2 V,
RDRV = 33 kW, DRV high
VDRV(drop)
1
V
CURRENT SENSE
Input Pull−up Current
VCS = 0.7 V
Ibias
1
mA
Maximum internal current setpoint
VFB > 3.5 V
VILIM
0.66
0.70
0.74
V
Propagation delay from VIlimit detection to
DRV off
VCS = VILIM
tdelay
80
110
ns
Leading Edge Blanking Duration for VILIM
tLEB
200
250
320
ns
Threshold for immediate fault protection
activation
VCS(stop)
0.95
1.05
1.15
V
Leading Edge Blanking Duration for VCS(stop)
(Note 6)
tBCS
90
120
150
ns
Soft−start duration
From 1st pulse to VCS = VILIM
tSSTART
8
11
14
ms
Frozen current setpoint
VI(freeze)
275
300
325
mV
INTERNAL SLOPE COMPENSATION
Slope of the compensation ramp
Scomp(65kHz)
Scomp(100kHz)
−32.5
−50
mV /
ms
FEEDBACK
Internal pull−up resistor
TJ = 25°C
RFB(up)
15
20
25
kW
5. Internal supply current only, currents sourced via FB pin is not included (current is flowing in GND pin only).
6. Guaranteed by design.
7. CS pin source current is a sum of Ibias and IOPC, thus at VHV = 125 V is observed the Ibias only, because IOPC is switched off.


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