NCP1601A, NCP1601B
Compact Fixed Frequency
Discontinuous or Critical
Conduction Voltage Mode
Power Factor Correction
Controller
The NCP1601 is a controller designed for Power Factor Correction
(PFC) boost circuits. The device operates in fixed- frequency
-
Discontinuous Conduction Mode (DCM) and variable- frequency
-
Critical Conduction Mode (CRM) and takes advantages from both
operating modes. DCM limits the maximum switching frequency. It
simplifies the front- ended EMI filter design. CRM limits the
-
maximum currents of the boost stage diode, MOSFET and inductor.
It reduces the costs and improves the reliability of the circuit. This
device substantially exhibits unity power factor while operating in
DCM and CRM. The NCP1601 minimizes the required number of
external components. It incorporates high safety protection features
that make the NCP1601 suitable for robust and compact PFC stages.
Features
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MARKING
DIAGRAM
8
8
1
SOIC- 8
-
D SUFFIX
CASE 751
1
1601x
ALYW
G
8
PDIP- 8
-
N SUFFIX
CASE 626
1
1
NCP1601x
AWL
YYWWG
8
Near- Unity Power Factor in DCM or CRM
-
Voltage- Mode Operation
-
Low Startup and Shutdown Current Consumption
Programmable Switching Frequency for DCM
Synchronization Capability
Overvoltage Protection (107% of Nominal Output Level)
Undervoltage Protection or Shutdown
(8% of Nominal Output Level)
Programmable Overcurrent Protection
Thermal Shutdown with Hysteresis (95/140C)
Two V
CC
Undervoltage Lockout Hysteresis Options:
4.75 V for NCP1601A and 1.5 V for NCP1601B
These are Pb- Free Devices
-
Electronic Light Ballast
AC Adapters
TV & Monitors
Mid- Power Applications
-
x
A
L, WL
Y, YY
W, WW
G
G
= A or B
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb-
-Free Package
= Pb-
-Free Package
PIN CONNECTIONS
FB 1
V
control
2
Ramp 3
CS 4
(Top View)
8 V
CC
7 Drv
6 GND
5 Osc
Typical Applications
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 16 of this data sheet.
Semiconductor Components Industries, LLC, 2010
December, 2010 - Rev. 6
1
Publication Order Number:
NCP1601A/D
NCP1601A, NCP1601B
AC
Input
EMI
Filter
Output
15 V
FB
V
CC
V
control
Drv
Ramp GND
CS
Osc
NCP1601X
Figure 1. Typical Application Circuit
L
Output Voltage (V
out
)
AC
Input
EMI
Filter
C
filter
R
CS
C
bulk
on
off
R
FB
I
S
I
FB
1
FB / SD
V
CC
V
CC
9V
V
control
Current
Mirror
V
CC(on)
/ 9 V
V
reg
2
300 k
Vcontrol Processing
+
-
-
9V
C
1
R
2
1
C
3
R
3
C
control
96% I
ref
I
ref
I
FB
8
18 V
+
-
-
Regulation Block
UVLO
R
1
Overvoltage
Protection
(I
FB
> 107% I
ref
)
Shutdown / UVP
(I
FB
< 8% I
ref
)
Zero Current
Detection
(I
S
< 14
mA)
Overcurrent
Protection
(I
S
> 203
mA)
OR
45
mA
0
V
CC
R
S
&
Reference
Block
Internal Bias
CS
&
-
-
+
V
ton
3.9 Vmax
clamp
PFC
Modulation
Thermal
Shutdown
(95 / 140
C)
4
9V
Osc / Sync
Current
Mirror
I
ch
Ramp
3
1
0
9V
C
ramp
5
C
OSC
9V
0
1
94
mA
+
-
-
S
R
Q
&
R
S
Q
Output
Driver
V
CC
Drv
5 / 3.5 V
7
GND
delay
Oscillator / Synchronization Block
6
Figure 2. Functional Block Diagram
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2
NCP1601A, NCP1601B
PIN FUNCTION DESCRIPTION
Pin
1
Symbol
FB
Function
Feedback /
Shutdown
Function
This pin receives a current I
FB
which is proportional to the PFC circuit output voltage. The current is
for the output regulation, output Overvoltage Protection (OVP), and output undervoltage protection
(UVP).
When I
FB
goes above 107% I
ref
, OVP is activated and the Drive Output is disabled.
When I
FB
goes below 8% I
ref
, the device enters a low-
-current consumption shutdown mode.
The voltage of this pin V
control
directly controls the input impedance and hence the power factor of
the circuit. This pin is connected to an external capacitor to limit the control voltage V
control
band-
width typically below 20 Hz to achieve Power Factor Correction.
This pin is connected to an external capacitor to set a ramp signal. The capacitor value directly
affects the input impedance of the PFC circuit and hence the maximum input power.
This pin sources a current I
S
which depends on the inductor current and an offset voltage. The
current is for Overcurrent Protection (OCP) and zero current detection.
When I
S
is above 200
mA,
OCP is activated and the Drive Output is disabled.
When I
S
is below 14
mA,
the circuit detects a zero current. This information is used by the on-
-time
modulation arrangement and by the oscillator block.
In oscillator mode, this pin is connected to an external capacitor to set the oscillator frequency of
the DCM operation.
In synchronization mode, this pin is connected to an external driving signal. The positive edge of the
drive output is synchronized to the negative edge of the external signal in DCM operation.
If the inductor current is non-
-zero at the end of a switching period, the output drive is not allowed to
turn on. CCM operation is prohibited. Instead, the circuit operates in CRM in this case.
-
-
This pin provides an output to an external MOSFET.
This pin is the positive supply of the device. The operating range is between 9 V and 18 V with
UVLO start threshold 13.75 V for NCP1601A and 10.5 V for NCP1601B.
2
V
control
Control
3
4
Ramp
CS
Ramp
Current Sense
5
Osc
Oscillator /
Synchronization
6
7
8
GND
Drv
V
CC
The IC ground
Drive Output
Supply Voltage
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3
NCP1601A, NCP1601B
MAXIMUM RATINGS
Rating
FB, V
control
, Ramp, CS, Osc Pins (Pins 1-
-5)
Maximum Voltage Range
Maximum Current
Drive Output (Pin 7)
Maximum Voltage Range
Maximum Current Range (Note 2)
Power Supply Voltage (Pin 8)
Maximum Voltage Range
Maximum Current
Power Dissipation and Thermal Characteristics
P suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T
A
=70
C
Thermal Resistance, Junction- -Air
-to-
D suffix, Plastic Package, Case 751
Maximum Power Dissipation @ T
A
=70
C
Thermal Resistance, Junction- -Air
-to-
Operating Junction Temperature Range
Storage Temperature Range
Symbol
V
max
I
max
V
max
I
max
V
max
I
max
Value
-
-0.3 to +9
100
-
-0.3 to +18
-
-500 to +750
-
-0.3 to +18
100
Unit
V
mA
V
mA
V
mA
P
D
R
θJA
P
D
R
θJA
T
J
T
stg
800
100
450
178
-
-40 to +125
-
-65 to +150
mW
C/W
mW
C/W
C
C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
A. This device series contains ESD protection and exceeds the following tests:
Pins 1- Human Body Model 2000 V per MIL-
-8:
-STD-
-883, Method 3015.
Machine Model Method 200 V.
B. This device contains Latchup protection and exceeds
100
mA per JEDEC Standard JESD78.
1. Guaranteed by design.
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4
NCP1601A, NCP1601B
ELECTRICAL CHARACTERISTICS
(For typical values T
J
= 25C. For min/max values, T
J
= --40C to +125C, V
CC
= 15 V,
V
control
= 100 nF, Ramp = 100 pF, Osc = 220 pF unless otherwise specified)
Characteristic
OSCILLATOR
Oscillator Frequency (Osc = 220 pF to GND)
Internal Capacitance of the Oscillator Pin
Maximum Oscillator Switching Frequency
Oscillator Discharge Current (Osc = 5.5 V)
Oscillator Charge Current (Osc = 3 V)
Comparator Lower Threshold (Osc = 220 pF to GND) (Note 3)
Comparator Upper Threshold (Osc = 220 pF to GND)
Synchronization Pulse Width for Detection
Synchronization Propagation Delay
GATE DRIVE
Gate Drive Resistor
Output High and Draw 100 mA out of Drv Pin (I
source
= 100 mA)
Output Low and Insert 100 mA into Drv Pin (I
sink
= 100 mA)
Gate Drive Rise Time from 1.5 V to 13.5 V (Drv = 1 nF to GND)
Gate Drive Fall Time from 13.5 V to 1.5 V (Drv = 1 nF to GND)
Reference Current
Regulation Block Ratio
V
control
Pin Internal Resistor
Maximum Control Voltage (I
FB
= 100
mA)
Feedback Pin Voltage (I
FB
= 100
mA)
Overvoltage Protection Current Ratio
Overvoltage Protection Current
Undervoltage Protection Current Ratio
CURRENT SENSE
Current Sense Pin Offset Voltage (I
S
= 100
mA)
Overcurrent Protection Level
Current Sense Pin Offset Voltage at Overcurrent Level
Zero Current Detection Level
Current Sense Pin Offset Voltage at Zero Current Level
Zero Current Sense Resistor (R
S(ZCD)
= V
S(ZCD)
/ I
S(ZCD)
)
RAMP
Charging Current (Ramp = 0 V)
Maximum Power Resistance (R
power
= V
control(max)
/ I
ch
)
Internal Clamping of Voltage V
ton
Internal Capacitance of the Ramp Pin
Ramp Pin Sink Resistance (Osc = 0 V, Ramp = 1 mA sourcing)
THERMAL SHUTDOWN
Thermal Shutdown Threshold (Note 4)
Thermal Shutdown Hysteresis
2. Comparator lower threshold is also the synchronization threshold.
3. Guaranteed by design.
-
-
-
-
T
SD
T
H
140
-
-
-
-
45
-
-
-
-
C
C
3
3
-
-
3
3
I
ch
R
power
V
ton(max)
C
ramp(int)
R
ramp
95
9.5
-
-
-
-
-
-
100
10.5
3.9
20
71.5
105
11.5
-
-
-
-
-
-
mA
kΩ
V
pF
Ω
4
4
4
4
4
4
V
S
I
S(OCP)
V
S(OCP)
I
S(ZCD)
V
S(ZCD)
R
S(ZCD)
-
-
190
0
9
0
-
-
4
203
3.2
14
7.5
0.536
-
-
210
20
19
20
1
mV
mA
mV
mA
mV
kΩ
7
R
OH
R
OL
7
7
1
1
2
2
1
1
1
1
t
r
t
f
I
ref
I
regL
/ I
ref
R
control
V
control(max)
V
FB1
I
OVP
/ I
ref
I
OVP
I
UVP
/ I
ref
5
2
-
-
-
-
192
95
-
-
0.95
-
-
104
-
-
4
11.6
7.2
53
32
203
96
300
1.05
3
107
217
8
20
18
-
-
-
-
208
97
-
-
1.15
-
-
-
-
225
15
Ω
Ω
ns
ns
mA
%
kΩ
V
V
%
mA
%
5
5
5
5
5
5
5
5
5
f
osc
C
osc(int)
f
osc(max)
I
odch
I
och
V
sync(L)
V
sync(H)
t
sync(min)
t
sync(d)
52
-
-
-
-
40
40
3.0
4.5
500
-
-
58
36
405
49
45
3.5
5
-
-
371
64
-
-
-
-
60
60
4.0
5.5
-
-
-
-
kHz
pF
kHz
mA
mA
V
V
ns
ns
Pin
Symbol
Min
Typ
Max
Unit
FEEDBACK / OVERVOLTAGE PROTECTION / UNDERVOLTAGE PROTECTION
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