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Linear Technology Electronic Components Datasheet

LT1509 Datasheet

Power Factor and PWM Controller

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FEATURES
s PFC and PWM Single Chip Solution
s Synchronized Operation up to 300kHz
s 99% Power Factor over 20:1 Load Current Range
s Current Mode PWM
s Instantaneous Overvoltage Protection
s Dedicated Overvoltage Protection (OVP Pin)
s Minimal Line Current Dead Zone
s Typical 250µA Start-Up Supply Current
s Line Switching Noise Filter
s Low Quiescent Current: 13mA
s Fast 2A Peak Current Gate Drivers
s Separate Soft Start Controls
U
APPLICATIONS
s Universal Power Factor Corrected Power Supplies
and Preregulators
LT1509
Power Factor and
PWM Controller
DESCRIPTION
The LT ®1509 is a complete solution for universal off-line
switching power supplies utilizing active power factor
correction. The PFC section is identical to the LT1248 PFC
controller except the EN/SYNC pin is removed because
PFC and PWM are synchronized internally.
The current mode PWM section (the LT1508 is the volt-
age-mode counterpart) contains all the primary side func-
tions to convert the PFC preregulated high voltage output
to an isolated low voltage output. The PWM duty cycle is
internally limited to 47% (maximum 50%) to prevent
transformer saturation. PWM soft start begins when PFC
output reaches the preset voltage. In the event of brief line
loss, the PWM will be shut off when the PFC output voltage
drops below 73% of the preset value.
, LTC and LT are registered trademarks of Linear Technology Corporation.
BLOCK DIAGRAM
VCC
16V TO 10V
VSENSE
14
IAC
9
OVP
11
SS1
16
7.5V
7.9V
14µA
14µA
SS2
13
+
EA
+
+
VAOUT
10
7.5V
VREF
VREF
12
MOUT ISENSE
87
RUN
2.2V +
M1
7µA
IA
25k
IB
IM =
IA2IB
200µA2
IM
CA
+
CAOUT
6
+
+
0.7V
PWM0K
+
7V to
4.7V
+
1V
CL
+
1.2V
–+
4
CSET
+
NOTE: PWM PULSE IS DELAYED BY 55% DUTY CYCLE AFTER PFC PULSE
19
RAMP
18 50µA
VC
GND1
3
PKLIM VCC
5 17
R
R
RUN S
Q
OSC
+
16V
15
RSET
55%
DELAY
R
SQ
R
200ns
BLANKING
16V
GTDR1
1
GND2
2
GTDR2
20
1500 • BD01
1


Linear Technology Electronic Components Datasheet

LT1509 Datasheet

Power Factor and PWM Controller

No Preview Available !

LT1509
DESCRIPTION
By using fixed high frequency PWM current averaging
without the need for slope compensation, the LT1509
achieves far lower line current distortion with a smaller
magnetic element than systems that use either peak
current detection, or zero current switching approach, in
both continuous and discontinuous modes of operation.
The LT1509 also provides filtering capability to reject line
switching noise which can cause instability when fed into
the multiplier. Line current dead zone is minimized with
low bias voltage at the current input to the multiplier.
The LT1509 provides many protection features including
peak current limiting and overvoltage protection. Imple-
mented with a very high speed process, the LT1509 can be
operated at frequencies as high as 300kHz.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage ........................................................ 27V
GTDR Current Continuous ...................................... 0.5A
GTDR Output Energy ................................................ 5µJ
IAC, RSET, PKLIM Input Current .............................. 20mA
VSENSE, OVP Input Voltage .................................... VMAX
RAMP, VC Input Voltage ............................................ 8V
ISENSE, MOUT Input Current ................................... ±5mA
Operating Junction Temperature Range
Commercial ........................................... 0°C to 100°C
Industrial .......................................... – 40°C to 125°C
Thermal Resistance (Junction-to-Ambient)
N Package ................................................... 100°C/W
SW Package ................................................ 120°C/W
PACKAGE/ORDER INFORMATION
TOP VIEW
GTDR1 1
GND2 2
GND1 3
CSET 4
PKLIM 5
CAOUT 6
ISENSE 7
MOUT 8
IAC 9
VAOUT 10
20 GTDR2
19 RAMP
18 VC
17 VCC
16 SS1
15 RSET
14 VSENSE
13 SS2
12 VREF
11 OVP
N PACKAGE
20-LEAD PDIP
SW PACKAGE
20-LEAD PLASTIC SO WIDE
TJMAX = 125°C, θJA = 100°C/ W (N)
TJMAX = 125°C, θJA = 120°C/ W (SW)
Consult factory for Military grade parts.
ORDER PART
NUMBER
LT1509CN
LT1509CSW
LT1509IN
LT1509ISW
ELECTRICAL CHARACTERISTICS
Maximum operating voltage (VMAX) = 25V, VCC = 18V, RSET = 15k to GND, CSET = 1nF to GND, IAC = 100µA, ISENSE = 0V, CAOUT = 3.5V,
VAOUT = 5V, OVP = VREF. No load on any outputs unless otherwise noted.
PARAMETER
Overall
Supply Current (VCC in Undervoltage Lockout)
Supply Current On
VCC Turn-On Threshold (Undervoltage Lockout)
VCC Turn-Off Threshold
Voltage Amplifier (PFC Section)
Voltage Amp Offset
Input Bias Current
Voltage Gain
Voltage Amp Unity-Gain Bandwidth
Voltage Amp Output High (Internally Clamped)
Voltage Amp Output Low
Voltage Amp Short-Circuit Current
CONDITIONS
VCC = Lockout Voltage – 0.2V
11.5V VCC VMAX
VAOUT = 3.5V
VSENSE = 0V to 7V
VAOUT = 0V
MIN TYP MAX
UNITS
q 0.25 0.45
q 13 19
q 15.5 16.5 17.5
q 9.5 10.5 11.5
mA
mA
V
V
q – 10
10
q – 25 – 250
70 100
3
q 11.3 13.3
q 1.1 2
q3
8 17
mV
nA
dB
MHz
V
V
mA
2


Part Number LT1509
Description Power Factor and PWM Controller
Maker Linear Technology
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LT1509 Datasheet PDF






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