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NCP1212 Datasheet(PDF) 5 Page - ON Semiconductor

Part No. NCP1212
Description  Current Mode PWM Controller for Both Forward and Flyback Converters
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1212 Datasheet(HTML) 5 Page - ON Semiconductor

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NCP1212
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ELECTRICAL CHARACTERISTICS (For typical values TJ = 25°C, DMAX = 48%, for min/max values TJ = −25°C to +105°C,
VCC = 16 V unless otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
OSCILLATOR SECTION
Oscillation Frequency, TJ = 25°C (DMAX = 48%, CT = 1.0 nF)
FOSC−48
81
90
99
kHz
Oscillation Frequency, TJ = 25°C (DMAX = 82%, CT = 1.0 nF)
FOSC−82
72
80
88
kHz
Frequency Change against Supply Voltage
(VCC = 13 V to 25 V, TJ = 25°C)
DFOSC−V
0.02
%
Frequency Change against Temperature
(VCC = 16 V, TJ = −25°C to 105°C)
DFOSC−T
5.0
%
CURRENT SENSE SECTION
Maximum Current Sense Input Threshold
VCS
0.96
1.0
1.16
V
Propagation Delay (Current Sense to Gate after LEB Blanking)
TPLH
150
200
ns
Leading Edge Blanking Time
TLEB
300
ns
SOFT−START SECTION
Soft−Start Charge Current
ISS
5.0
8.0
11
mA
Overload Timing Discharge Current (Note 3)
ISD−ISS
15
20
26
mA
48% Duty Cycle Selection Input Voltage Threshold
VD48
2.5
V
82% Duty Cycle Selection Input Voltage Threshold
VD82
3.0
V
GATE DRIVER SECTION
Gate Drive Sink Capability, VCC = 15 V, VDRV = 1.0 V
IOL
100
mA
Gate Drive Source Capability, VCC = 15 V, VDRV = 5.0 V (Note 4)
IOH
300
mA
Gate Drive Voltage (From 1.0 V to 11 V) Rise Time (CL = 1.0 nF, TJ = 25°C)
Tr
25
50
ns
Gate Drive Voltage (From 11 V to 1.0 V) Fall Time (CL = 1.0 nF, TJ = 25°C)
Tf
25
50
ns
IC POWER SUPPLY SECTION
VCC Startup Threshold Voltage
VCCTH
13.5
15
16.5
V
VCC Overvoltage Lockout Threshold
VCCOVLO
22.5
25
27.5
V
VCC Undervoltage Lockout Threshold
VCCUVLO
8.5
10
11.5
V
Power Supply Current, before Startup (VCC = 12 V)
IC1
0.15
0.26
mA
Power Supply Current, Operating
IC2
3.0
5.0
mA
Power Supply Current, Shutdown (VCC = 15 V)
IC3
3.0
mA
BROWNOUT DETECT SECTION (BOK)
Brownout Input Threshold Voltage
VBOK
1.14
1.21
1.27
V
Brownout Hysteresis Current
IBOK
38
45
54
mA
MAXIMUM DUTY CYCLE SECTION
Maximum Duty Cycle at Soft−Start Pin Voltage between 2.1 V and 2.8 V
(2.1 V
v VDMAX v 2.8 V)
DMAX48
47
48
50
%
Maximum Duty Cycle at Soft−Start Pin Voltage Higher than 3.0 V
(VDMAX w 3.0 V)
DMAX82
79
82
88
%
3. ISD is an internal current source not accessible externally.
4. The output voltage is internally clamped by 13.5 V Zener.


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