19-1555; Rev 2; 4/02
KIT
ATION
EVALU
BLE
AVAILA
High-Voltage PWM
Power-Supply Controller
General Description
Features
o
Wide Input Range: 11V to 110V
o
Internal High-Voltage Startup Circuit
o
Externally Adjustable Settings
Output Switch Current Limit
Oscillator Frequency
Soft-Start
Undervoltage Lockout
Maximum Duty Cycle
o
Low External Component Count
o
External Frequency Synchronization
o
Primary or Secondary Regulation
o
Input Feed-Forward for Fast Line-Transient
Response
o
Precision ±2.5% Reference over Rated
Temperature Range
o
Thermal Shutdown
The MAX5003 high-voltage switching power-supply
controller has all the features and building blocks need-
ed for a cost-effective flyback and forward voltage-
mode control converter. This device can be used to
design both isolated and nonisolated power supplies
with multiple output voltages that operate from a wide
range of voltage sources. It includes a high-voltage
internal start-up circuit that operates from a wide 11V to
110V input range. The MAX5003 drives an external N-
channel power MOSFET and has a current-sense pin
that detects overcurrent conditions and turns off the
power switch when the current-limit threshold is
exceeded. The choice of external power MOSFET and
other external components determines output voltage
and power.
The MAX5003 offers some distinctive advantages: soft-
start, undervoltage lockout, external frequency synchro-
nization, and fast input voltage feed-forward. The
device is designed to operate at up to 300kHz switch-
ing frequency. This allows use of miniature magnetic
components and low-profile capacitors. Undervoltage
lockout, soft-start, switching frequency, maximum duty
cycle, and overcurrent protection limit are all adjustable
using a minimum number of external components. In
systems with multiple controllers, the MAX5003 can be
externally synchronized to operate from a common sys-
tem clock.
Warning:
The MAX5003 is designed to operate with
high voltages. Exercise caution.
The MAX5003 is available in 16-pin SO and QSOP pack-
ages. An evaluation kit (MAX5003EVKIT) is also available.
MAX5003
Ordering Information
PART
MAX5003CEE
MAX5003CSE
MAX5003C/D
MAX5003EEE
MAX5003ESE
TEMP. RANGE
0°C to +70°C
0°C to +70°C
(Note A)
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 Narrow SO
Dice
16 QSOP
16 Narrow SO
Applications
Telecommunication Power Supplies
ISDN Power Supplies
+42V Automobile Systems
High-Voltage Power-Supply Modules
Industrial Power Supplies
Note:
Dice are designed to operate over a -40°C to +140°C junc-
tion temperature (T
j
) range, but are tested and guaranteed at
T
A
= +25°C.
Pin Configuration
TOP VIEW
V+ 1
INDIV 2
ES 3
FREQ 4
SS 5
REF 6
CON 7
COMP 8
16 V
DD
15 V
CC
14 NDRV
MAX5003
13 PGND
12 CS
11 AGND
10 MAXTON
9
FB
QSOP/Narrow SO
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
High-Voltage PWM
Power-Supply Controller
MAX5003
ABSOLUTE MAXIMUM RATINGS
V+ to GND ............................................................-0.3V to +120V
ES to GND ..............................................................-0.3V to +40V
V
DD
to GND ............................................................-0.3V to +19V
V
CC
to GND .........................................................-0.3V to +12.5V
MAXTON, COMP, CS, FB, CON to GND..................-0.3V to +8V
NDRV, SS, FREQ to GND ...........................-0.3V to (V
CC
+ 0.3V)
I
NDIV
, REF to GND.................................................-0.3V to +4.5V
V
CC
, V
DD
, V+, ES Current ................................................±20mA
NDRV Current, Continuous...............................................±25mA
NDRV Current,
≤
1µs .............................................................±1A
CON and REF Current ......................................................±20mA
All Other Pins ....................................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin SO (derate 9.5mW/°C above +70°C)...............762mW
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Maximum Junction Temperature (T
J
) ..............................+150°C
Operating Temperature Ranges
MAX5003C_E ....................................................0°C to +70°C
MAX5003E_E ..................................................-40°C to +85°C
Operating Junction Temperature (T
J
) .............................+125°C
16-Pin SO
θ
JA
.................................................................105°C/W
16-Pin QSOP
θ
JA
............................................................120°C/W
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V+ = V
ES
= V
DD
= +12V, V
INDIV
= 2V, V
CON
= 0, R
FREQ
= R
MAXTON
= 200kΩ, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETER
SUPPLY CURRENT
Shutdown Current
Supply Current
PREREGULATOR/STARTUP
V+ Input Voltage (Note 1)
E
S
Input Voltage (Note 1)
E
S
Output Voltage
V
DD
Output Voltage
V
DD
Input Voltage Range
V
DD
Regulator Turn-Off Voltage
CHIP SUPPLY (V
CC
)
V
CC
Output Voltage
V
CC
Undervoltage
Lockout Voltage
OUTPUT DRIVER
Peak Source Current
Peak Sink Current
NDRV Resistance High
NDRV Resistance Low
REFERENCE
REF Output Voltage
REF Voltage Regulation
2
R
OH
R
OL
V
REF
∆V
REF
V
NDRV
= 0, V
CC
supported by V
CC
capacitor
V
NDRV
= V
CC
I
NDRV
= 50 mA
I
NDRV
= 50 mA
No load
I
REF
= 0 to 1mA
2.905
570
1000
4
1
3.000
5
12
mA
mA
Ω
Ω
V
mV
V
CC
V
CCLO
V+ = 36V, ES = unconnected,
V
DD
= 18.75V
V
CC
falling
7.4
6.3
12
V
V
V+
V
ESI
V
ESO
V
DD
V
DD
V
TO
E
S
= V
DD
= uncon-
nected
I
NDRV
= 2mA
I
NDRV
= 5mA
10.8
25
110
36
36
9
10.75
10.75
9.75
10.5
18.75
V
V
V
V
V
V
V
I+
I
DD
V
INDIV
= 0, V+ = 110V, V
ES
= V
DD
=
unconnected
V+ = V
ES
, V
DD
= 18.75
35
75
1.2
µA
mA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
DD
= unconnected, V+ = V
ES
, I
NDRV
= 7.5mA
V+ = 110V, V
DD
= unconnected
V+ = 36V, I
DD
= 0 to 7.5mA,
ES = unconnected
V+ = V
ES
= 36V, I
NDRV
= 7.5mA
V+ = 36V, I
V+
< 75µA,
ES = unconnected
3.098
20
_______________________________________________________________________________________
High-Voltage PWM
Power-Supply Controller
ELECTRICAL CHARACTERISTICS (continued)
(V+ = V
ES
= V
DD
= +12V, V
INDIV
= 2V, V
CON
= 0, R
FREQ
= R
MAXTON
= 200kΩ, T
A
= T
MIN to
T
MAX
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETERS
CURRENT LIMIT
CS Threshold Voltage
CS Input Bias Current
Overcurrent Delay
CS Blanking Time
ERROR AMPLIFIER
Voltage Gain
Unity-Gain Bandwidth
Phase Margin
Output Clamp Low
Output Clamp High
FB Regulation Voltage
FB Bias Current
FB V
SET
Tempco
UNDERVOLTAGE LOCKOUT
INDIV Undervoltage Lockout
INDIV Hysteresis
INDIV Bias Current
MAIN OSCILLATOR—EXTERNAL MODE
FREQ Input Low
FREQ Input High
FREQ Output Low
External Oscillator Maximum
Low Time
FREQ Range
Frequency Range
FREQ HI/LO Pulse Width
MAIN OSCILLATOR—INTERNAL MODE
FREQ Resistor Range
Oscillator Frequency
FREQ Output Current High
FREQ Output Current Low
MAXIMUM DUTY CYCLE
(MAXTON)
Maximum Programmable
Duty Cycle
V
INDIV
= 1.25V
75
%
I
OH
I
OL
V
FREQ
= 0
V
FREQ
= 1.5V
R
FREQ
50
80
100
500
120
300
1
kΩ
kHz
µA
µA
V
IL
V
IH
I
OL
t
EXT
f
FREQ
f
S
f
S
= 1/4 f
FREQ
V
CON
= 3.0V
V
CON
= 3.0V
V
FREQ
= 5V, V
CON
= 3.0V
(Note 2)
8
200
50
150
13
1200
300
2.7
1
0.8
V
V
µA
µs
kHz
kHz
ns
V
INDIVLO
V
HYST
V
INDIV
= 1.28V
-1
V+ = V
ES
= V
DD
=
10.8V and 18.75V
V
INDIV
falling
V
INDIV
rising
1.15
1.23
1.20
1.32
125
0.01
+1
1.25
1.45
V
mV
µA
A
V
BW
φ
V
COMPL
V
COMPH
V
SET
I
FB
TC
FB
I
COMP
= 5µA; V
COMP
= 0.5V, 2.5V
R
LOAD
= 200kΩ, C
LOAD
= 100pF
A
VOL
= 1V/V, C
LOAD
= 100pF
At COMP
At COMP
FB = COMP, V
CON
= 1.5V
V
FB
= 1.5V
1.448
-1
60
80
1.2
65
0.25
3.00
1.485
0.1
100
1.522
+1
dB
MHz
degrees
V
V
V
µA
ppm/°C
V
CS
I
CS
t
D
t
B
V
CON
= 1.25V
0 < V
CS
< 0.1V
From end of blanking time 25mV overdrive
80
-1
240
70
100
120
+1
mV
µA
ns
ns
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5003
FEEDBACK INPUT AND SET POINT
_______________________________________________________________________________________
3
High-Voltage PWM
Power-Supply Controller
MAX5003
ELECTRICAL CHARACTERISTICS (continued)
(V+ = V
ES =
V
DD
= +12V, V
INDIV
= 2V, V
CON
= 0, R
FREQ
= R
MAXTON
= 200kΩ, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical
values are at T
A
= +25°C.)
PARAMETERS
PWM OSCILLATOR
MAXTON Resistor Range
Maximum On-Time Range
Input Voltage Feed Forward
Ratio
RAMP Voltage Low
RAMP Voltage High
Minimum On-Time
SOFT-START
SS Source Current
SS Sink Current
SS Time
PWM COMPARATOR
CON Bias Current
THERMAL SHUTDOWN
Thermal Shutdown Temperature
Thermal Hysteresis
Note 1:
Note 2:
Note 3:
Note 4:
See the
Typical Operating Characteristics
for preregulator current-to-voltage characteristics.
Maximum time FREQ can be held below V
IL
and still remain in external mode.
Feed-forward Ratio = Duty cycle at (V
INDIV
= 1.5V)/Duty cycle at (V
INDIV
= 1.875V)
Occurs at start-up and until V
REF
is valid.
150
20
°C
°C
I
CON
V
CON
= 0.5V and 2.5V
-1
0.01
1
µA
V
SS
= 0.5V, V
DD
= unconnected, V
CON
= 1.5V
V
SS
= 0.4V (Note 4)
3.4
5.5
10
0.45
9
µA
mA
s/µF
R
MAXTON
t
ON
R
MAXTON
= 200kΩ, V
INDIV
= 1.25V
V
INDIV
stepped from 1.5V to 1.875V, V
CON
=
3.0V (Note 3)
V
INDIV
= 1.875V
0.72
0.48
50
7.5
0.8
0.5
2.5
200
0.88
0.53
V
V
ns
500
kΩ
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Typical Operating Characteristics
(V
DD
= +12V, R
FREQ
= 200kΩ, R
MAXTON
= 200kΩ, T
A
= +25°C, unless otherwise noted.)
FB SET-POINT VOLTAGE CHANGE
vs. TEMPERATURE
MAX5003-01
FB SET-POINT VOLTAGE CHANGE
vs. SUPPLY VOLTAGE
MAX5003-02
SWITCHING FREQUENCY CHANGE
vs. TEMPERATURE
0.20
FREQUENCY CHANGE (%)
0
-0.20
-0.40
-0.60
-0.80
-1.00
-1.20
MAX5003-03
0.8
FB SET-POINT VOLTAGE CHANGE (%)
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
0.8
-20
0
20
40
60
80
0.100
FB SET-POINT VOLTAGE CHANGE (%)
0.075
0.050
0.025
0
-0.025
-0.050
-0.075
-0.100
0.40
100
11
12
13
14
15
16
17
18
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
V
DD
(V)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
High-Voltage PWM
Power-Supply Controller
Typical Operating Characteristics (continued)
(V
DD
= +12V, R
FREQ
= 200kΩ, R
MAXTON
= 200kΩ, T
A
= +25°C, unless otherwise noted.)
MAX5003
V+ INPUT CURRENT vs. VOLTAGE
MAX5003-04
V+ INPUT CURRENT vs. TEMPERATURE
MAX5003-05
MAXIMUM DUTY CYCLE vs. V
INDIV
400kΩ
300kΩ
200kΩ
70
60
DUTY CYCLE (%)
MAX5003-06
MAX5003-09
3.0
2.5
2.0
I
V
+ (mA)
1.5
1.0
0.5
0
20
40
60
V+ (V)
80
100
2.50
80
2.00
50
40
30
20
10
V
CON
CLAMPED HIGH
0
-40
-20
0
20
40
60
80
100
1.0
1.5
2.0
V
INDIV
(V)
TEMPERATURE (°C)
100kΩ
I
V
+ (mA)
1.50
1.00
0.50
V
CON
= V
COMP
= V
FB
SWITCHING
120
V
CON
= V
COMP
= V
FB
SWITCHING
V+ = 110V
0
PARAMETER IS
R
MAXTON
2.5
3.0
ERROR AMP FREQUENCY RESPONSE
70
60
50
40
GAIN (dB)
30
20
10
0
-10
-20
0.1k
1k
10k
100k
1M
10M
FREQUENCY (Hz)
PHASE
MAX5003-07
SWITCHING FREQUENCY AND PERIOD
vs. R
FREQ
0
-20
-40
PHASE (degrees)
-60
-80
-100
-120
-140
-160
-180
FREQUENCY (kHz)
400
350
FREQUENCY
300
250
PERIOD
200
150
100
50
0
0
100
200
300
400
500
R
FREQ
(kΩ)
0
10
20
30
PERIOD (µs)
MAX5003-08
V+ SHUTDOWN CURRENT
vs. TEMPERATURE
40
40
39
38
37
I
V
+ (µA)
36
35
34
33
32
31
30
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
V+ = 110V
V
INDIV
= 0
V
DD
= UNCONNECTED
GAIN
V+ CURRENT IN BOOTSTRAPPED
OPERATION vs. TEMPERATURE
MAX5003-10
V
CC
LOAD REGULATION
9
8
7
V
CC
(V)
6
5
4
3
V+ = 12V
V+ = 13V
V+ = 14V
V+ = 15V
ES = UNCONNECTED
V
DD
= UNCONNECTED
0
5
10
I
CC
(mA)
15
20
V+ = 50V TO 110V
MAX5003-11
28.0
V+ = 110V
V
INDIV
= 1.5V
27.5
I
V
+ (µA)
10
27.0
26.5
2
1
26.0
-50
0
50
100
TEMPERATURE (°C)
0
_______________________________________________________________________________________
5
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