NCP1653, NCP1653A
www.onsemi.com
3
PIN FUNCTION DESCRIPTION
Pin Symbol Name Function
1 FB / SD Feedback /
Shutdown
This pin receives a feedback current I
FB
which is proportional to the PFC circuit output voltage.
The current is for 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−consumption shutdown mode.
2 V
control
Control Voltage /
Soft−Start
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 C
control
to limit the V
control
bandwidth
typically below 20 Hz to achieve near unity power factor.
The device provides no output when V
control
= 0 V. Hence, C
control
also works as a soft−start
capacitor.
3 In Input Voltage
Sense
This pin sinks an input−voltage current I
vac
which is proportional to the RMS input voltage V
ac
.
The current I
vac
is for overpower limitation (OPL) and PFC duty cycle modulation. When the
product (I
S
⋅I
vac
) goes above 3 nA
2
, OPL is activated and the Drive Output duty ratio is reduced by
pulling down V
control
indirectly to reduce the input power.
4 CS Input Current
Sense
This pin sources a current I
S
which is proportional to the inductor current I
L
. The sense current I
S
is for overcurrent protection (OCP), overpower limitation (OPL) and PFC duty cycle modulation.
When I
S
goes above 200 mA, OCP is activated and the Drive Output is disabled.
5 V
M
Multiplier
Voltage
This pin provides a voltage V
M
for the PFC duty cycle modulation. The input impedance of the
PFC circuit is proportional to the resistor R
M
externally connected to this pin. The device operates
in average current−mode if an external capacitor C
M
is connected to the pin. Otherwise, it
operates in peak current−mode.
6 GND The IC Ground −
7 Drv Drive Output This pin provides an output to an external MOSFET.
8 V
CC
Supply Voltage This pin is the positive supply of the device. The operating range is between 8.75 V and 18 V with
UVLO start threshold 13.25 V.
MAXIMUM RATINGS
Rating Symbol Value Unit
FB, V
control
, In, CS, V
M
Pins (Pins 1−5)
Maximum Voltage Range
Maximum Current
V
max
I
max
−0.3 to +9
100
V
mA
Drive Output (Pin 7)
Maximum Voltage Range
Maximum Current Range (Note 3)
V
max
I
max
−0.3 to +18
1.5
V
A
Power Supply Voltage (Pin 8)
Maximum Voltage Range
Maximum Current
V
max
I
max
−0.3 to +18
100
V
mA
Transient Power Supply Voltage, Duration < 10 ms, IV
CC
< 20 mA 25 V
Power Dissipation and Thermal Characteristics
P suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T
A
= 70°C
Thermal Resistance Junction−to−Air
D suffix, Plastic Package, Case 751
Maximum Power Dissipation @ T
A
= 70°C
Thermal Resistance Junction−to−Air
P
D
R
q
JA
P
D
R
q
JA
800
100
450
178
mW
°C/W
mW
°C/W
Operating Junction Temperature Range T
J
−40 to +125 °C
Storage Temperature Range T
stg
−65 to +150 °C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality
should not be assumed, damage may occur and reliability may be affected.
1. This device series contains ESD protection and exceeds the following tests:
Pins 1−8: Human Body Model 2000 V per JEDEC Standard JESD22, Method A114.
Machine Model Method 190 V per JEDEC Standard JES222, Method A115A.
2. This device contains Latchup protection and exceeds ±100 mA per JEDEC Standard JESD78.
3. Guaranteed by design.
