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NCP1271D100R2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
NCP1271
http://onsemi.com
4
Figure 2. Functional Block Diagram
−
LEB
Skip/ latch
CS
FB
7.5% Jittering
65, 100 kHz
Oscillator
130ms
delay
HV
S
R
Drv
Gnd
PWM
skip
OR
4.8 V
8 V
Max duty
R
S
= 80%
180 ns
0
&
+
−
+
−
+
−
+
soft−skip
8
2
3
4
1
6
5
V
ss
V
FB
latch−off, reset
when Vcc < 4V
jittered ramp
current source
I
V
short
circuit
fault
12.6/
5.8 V
9.1 V
turn off
UVLO
−
+
−
+
turn on internal bias
4.1 mA when Vcc > 0.6 V
driver:
+500 mA
/ −800 mA
10V
disable
soft
skip
skip
&
double
hiccup
S
Q
10V
10V
20V
V
CS
V
CC
V
CC
0
100uA
0.2 mA when Vcc < 0.6 V
Soft start/ soft−skip
management
−
TLD
+
soft
start
2.85 V
1 / 3
13 us filter
1 0
skip
R
skip
4 ms/ 300 us
R
CS
R
ramp
(1V max)
16.7k
75.3k
V / 3
FB
V
PWM
V
FB
Q
R
Q
B2
Counter
V
skip
= R
skip
* I
skip
or
V
skip
= 1.2 V when pin 1 is opened
1
PIN FUNCTION DESCRIPTION
Pin No. Symbol Function Description
1 Skip/latch Skip Adjust or
Latchoff
A resistor to ground provides the adjustable standby skip level. Additionally, if this pin is
pulled higher than 8.0 V (typical), the controller latches off the drive.
2 FB Feedback An optocoupler collector pulls this pin low during regulation. If this voltage is less than
the Skip pin voltage, then the driver is pulled low and Soft−Skip mode is activated. If this
pin is open (>3 V) for more than 130 ms, then the controller is placed in a fault mode.
3 CS Current Sense This pin senses the primary current for PWM regulation. The maximum primary current
is limited to 1.0 V / R
CS
where R
CS
is the current sense resistor. Additionally, a ramp
resistor R
ramp
between the current sense node and this pin sets the compensation ramp
for improved stability.
4 Gnd IC Ground −
5 Drv Driver Output The NCP1271’s powerful output is capable of driving the gates of large Qg MOSFETs.
6 V
CC
Supply Voltage This is the positive supply of the device. The operating range is between 10 V (min) and
20 V (max) with a UVLO start threshold 12.6 V (typ).
8 HV High Voltage This pin provides (1) Lossless startup sequence (2) Double hiccup fault mode (3)
Memory for latch−off shutdown and (4) Device protection if V
CC
is shorted to GND.
NCP1271
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (For typical values T
J
= 25°C, for min/max values, T
J
= −40°C to +125°C, V
CC
= 14 V,
HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
Characteristic Pin Symbol Min Typ Max Unit
OSCILLATOR
Oscillation Frequency (65 kHz Version, T
J
= 25_C)
Oscillation Frequency (65 kHz Version, T
J
= −40 to + 85_C)
Oscillation Frequency (65 kHz Version, T
J
= −40 to + 125_C)
Oscillation Frequency (100 kHz Version, T
J
= 25_C)
Oscillation Frequency (100 kHz Version, T
J
= −40 to +85_C)
Oscillation Frequency (100 kHz Version, T
J
= −40 to +125_C)
5 f
osc
61.75
58
55
95
89
85
65
65
65
100
100
100
68.25
69
69
105
107
107
kHz
Oscillator Modulation Swing, in Percentage of f
osc
5 − − "7.5 − %
Oscillator Modulation Swing Period 5 − − 6.0 − ms
Maximum Duty Cycle (V
CS
= 0 V, V
FB
= 2.0 V) 5 D
max
75 80 85 %
GATE DRIVE
Gate Drive Resistance
Output High (V
CC
= 14 V, Drv = 300 W to Gnd)
Output Low (V
CC
= 14 V, Drv = 1.0 V)
5
R
OH
R
OL
6.0
2.0
11
6.0
20
12
W
Rise Time from 10% to 90% (Drv = 1.0 nF to Gnd) 5 t
r
− 30 − ns
Fall Time from 90% to 10% (Drv = 1.0 nF to Gnd) 5 t
f
− 20 − ns
CURRENT SENSE
Maximum Current Threshold 3 I
Limit
0.95 1.0 1.05 V
Soft−Start Duration − t
SS
− 4.0 − ms
Soft−Skip Duration − t
SK
− 300 − ms
Leading Edge Blanking Duration 3 t
LEB
100 180 330 ns
Propagation Delay (Drv =1.0 nF to Gnd) − − − 50 150 ns
Ramp Current Source Peak 3 I
ramp(H)
− 100 − mA
Ramp Current Source Valley 3 I
ramp(L)
− 0 − mA
SKIP
Default Standby Skip Threshold (Pin 1 = Open) 2 V
skip
− 1.2 − V
Skip Current (Pin 1 = 0 V, T
J
= 25_C) 1 I
skip
26 43 56 mA
Skip Level Reset (Note 5) 1 V
skip−reset
5.0 5.7 6.5 V
Transient Load Detection Level to Disable Soft−Skip Mode 2 V
TLD
2.6 2.85 3.15 V
EXTERNAL LATCH
Latch Protection Threshold 1 V
latch
7.1 8.0 8.7 V
Latch Threshold Margin (V
latch−m
= V
CC(off)
− V
latch
) 1 V
latch−m
0.6 1.2 − V
Noise Filtering Duration 1 − − 13 − ms
Propagation Delay (Drv = 1.0 nF to Gnd) 1 T
latch
− 100 − ns
SHORT−CIRCUIT FAULT PROTECTION
Time for Validating Short−Circuit Fault Condition 2 t
protect
− 130 − ms
5. Please refer to Figure 39 for detailed description.
6. Guaranteed by design.
NCP1271
http://onsemi.com
6
ELECTRICAL CHARACTERISTICS (continued) (For typical values T
J
= 25°C, for min/max values, T
J
= −40°C to +125°C,
V
CC
= 14 V, HV = open, skip = open, FB = 2 V, CS = Ground, DRV = 1 nF, unless otherwise noted.)
Characteristic Pin Symbol Min Typ Max Unit
STARTUP CURRENT SOURCE
High−Voltage Current Source
Inhibit Voltage (I
CC
= 200 mA, HV = 50 V)
Inhibit Current (V
CC
= 0 V, HV = 50 V)
Startup (V
CC
= V
CC(on)
− 0.2 V, HV = 50 V)
Leakage (V
CC
= 14 V, HV = 500 V)
6
6
6
8
V
inhibit
I
inhibit
I
HV
I
HV−leak
190
80
3.0
10
600
200
4.1
25
800
350
6.0
50
mV
mA
mA
mA
Minimum Startup Voltage (V
CC
= V
CC(on)
– 0.2 V, I
CC
= 0.5 mA) 8 V
HV(min)
− 20 28 V
SUPPLY SECTION
V
CC
Regulation
Startup Threshold, V
CC
Increasing
Minimum Operating Voltage After Turn−On
V
CC
Operating Hysteresis
Undervoltage Lockout Threshold Voltage, V
CC
Decreasing
Logic Reset Level (V
CC(latch)
–V
CC(reset)
> 1.0 V) (Note 7)
6
V
CC(on)
V
CC(off)
V
CC(on)
− V
CC(off)
V
CC(latch)
V
CC(reset)
11.2
8.2
3.0
5.0
−
12.6
9.1
3.6
5.8
4.0
13.8
10
4.2
6.5
−
V
V
V
V
V
V
CC
Supply Current
Operating (V
CC
= 14 V, 1.0 nF Load, V
FB
= 2.0 V, 65 kHz Version)
Operating (V
CC
= 14 V, 1.0 nF Load, V
FB
= 2.0 V, 100 kHz Version)
Output Stays Low (V
CC
= 14 V, V
FB
= 0 V)
Latchoff Phase (V
CC
= 7.0 V, V
FB
= 2.0 V)
6
I
CC1
I
CC1
I
CC2
I
CC3
−
−
−
−
2.3
3.1
1.3
500
3.0
3.5
2.0
720
mA
mA
mA
mA
7. Guaranteed by design.
TYPICAL CHARACTERISTICS
Figure 3. Oscillation Frequency vs.
Temperature
Figure 4. Maximum Duty Cycle vs.
Temperature
TEMPERATURE (°C) TEMPERATURE (°C)
1251007550250−50
50
60
70
80
90
100
110
1251007550250−50
75
76
77
78
79
80
81
OSCILLATION FREQUENCY (kHz)
MAXIMUM DUTY CYCLE (%)
−25 −25
82
83
84
85
100 kHz
65 kHz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

NCP1271D100R2G

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Manufacturer:
ON Semiconductor
Description:
Switching Controllers ANA PMW CONTROLLER
Lifecycle:
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