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NCL30288BSNT1G

P1-P3P4-P6P7-P9P10-P12P13-P15
NCL30288
www.onsemi.com
13
Figure 9. Winding Short Circuit Protection, Max. Peak Current Limit Circuits
S
R
Q
Q
CS
LEB1
+
−
S
R
Q
Q
DRV
Ipkmax
PWMreset
V
ILIMIT
+
−
LEB2
V
CS(stop)
WOD_SCP
+
−
STOP
OVP2
4−s auto−recovery timer
OFF
4−pulse
counter
AUX_SCP
VCC(ovp)
UVLO
BONOK
TSD
V / 4
control
• V
CC
Over Voltage Protection
The circuit stops generating pulses if V
CC
exceeds
V
CC(OVP)
and enters auto−recovery mode. This feature
protects the circuit if the output LED string happens to
open or is disconnected.
• Programmable Over Voltage Protection (OVP2)
The ZCD signal is compared to an internal 4.5 V
threshold. If V
ZCD
exceeds this threshold for more than
1 ms (after the ZCD blanking time), an OVP event is
detected. If this happens for 4 consecutive switching
cycles, an OVP fault is detected and the system enters
auto−recovery mode.
• Cycle−by−Cycle Current Limit
When the current sense voltage exceeds the internal
threshold V
ILIM
, the MOSFET is turned off for the rest
of the switching cycle.
• Brown−Out Protection
The NCL30288 prevents operation when the line
voltage is too low for proper operation. As sketched in
Figure 10, the circuit detects a brown−out situation
(BONOK is high) if the V
S
pin remains below the
V
BO(off)
threshold (0.9 V typical) for more than the
25 ms blanking time. In this case, the controller stops
operating. Operation resumes as soon as the V
S
pin
voltage exceeds V
BO(on)
(1.0 V typical) and V
CC
is
higher than V
CC(on)
. To ease recovery, the circuit
overrides the V
CC
normal sequence (no need for V
CC
cycling down below V
CC(off)
). Instead, its consumption
immediately reduces to I
CC(start)
so that V
CC
rapidly
charges up to V
CC(on)
. Once done, the circuit re−starts
operating.
Figure 10. Brown−out Protection Circuit
25 ms
blanking time
reset
+
−
Input Voltage
Rail
BONOK
V
S
V
BO(on)
if BONOK is high
V
BO(off)
if BONOK is low
NCL30288
www.onsemi.com
14
• Die Over Temperature (TSD)
The circuit stops operating if the junction temperature
(T
J
) exceeds 150°C typically. The controller remains
off until T
J
goes below nearly 100°C.
• Pin connection faults
The circuit addresses most pin connection fault cases.
In particular, the circuit detects the CS pin short to
ground situations by sensing the CS/ZCD pin
impedance every time it starts−up and after DRV pulses
are terminated by the 36 ms maximum on−time. If the
measured impedance does not exceed 170 W typically,
the circuit stops operating. In practice, it is
recommended to place a minimum of 500 W in series
between the CS pin and the current sense resistor to
take into account possible parametric deviations.
More generally, pin incorrect connection situations (open,
grounded, shorted to adjacent pin) are covered by
ANDxxxx.
NCL30288
www.onsemi.com
15
PACKAGE OUTLINE
TSOP−6
CASE 318G−02
ISSUE V
23
456
D
1
e
b
E1
A1
A
0.05
NOTES:
1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH. MINIMUM
LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL.
4. DIMENSIONS D AND E1 DO NOT INCLUDE MOLD FLASH,
PROTRUSIONS, OR GATE BURRS. MOLD FLASH, PROTRUSIONS, OR
GATE BURRS SHALL NOT EXCEED 0.15 PER SIDE. DIMENSIONS D
AND E1 ARE DETERMINED AT DATUM H.
5. PIN ONE INDICATOR MUST BE LOCATED IN THE INDICATED ZONE.
c
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
DIM
A
MIN NOM MAX
MILLIMETERS
0.90 1.00 1.10
A1 0.01 0.06 0.10
b 0.25 0.38 0.50
c 0.10 0.18 0.26
D 2.90 3.00 3.10
E 2.50 2.75 3.00
e 0.85 0.95 1.05
L 0.20 0.40 0.60
0.25 BSC
L2
−
0° 10°
1.30 1.50 1.70
E1
E
RECOMMENDED
NOTE 5
L
C
M
H
L2
SEATING
PLANE
GAUGE
PLANE
DETAIL Z
DETAIL Z
0.60
6X
3.20
0.95
6X
0.95
PITCH
DIMENSIONS: MILLIMETERS
M
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P1-P3P4-P6P7-P9P10-P12P13-P15

NCL30288BSNT1G

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LED Lighting Drivers HIGH PF PWM PRIMARY SIDE
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