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MAX5020ESA+T

P1-P3P4-P6P7-P9P10-P12P13-P14
General Description
The MAX5019/MAX5020 integrate all the building
blocks necessary for implementing DC-DC fixed-fre-
quency power supplies. Either primary- or secondary-
side regulation may be used to implement isolated or
nonisolated power supplies. These devices are current-
mode controllers with an integrated high-voltage start-
up circuit suitable for telecom/industrial voltage range
power supplies. Current-mode control with leading-
edge blanking simplifies control-loop design and inter-
nal ramp compensation circuitry stabilizes the current
loop when operating at duty cycles above 50%
(MAX5019). The MAX5019 allows 85% operating duty
cycle and can be used to implement flyback converters
whereas the MAX5020 limits the operating duty cycle to
less than 50% and can be used in single-ended for-
ward converters. A high-voltage startup circuit allows
these devices to draw power directly from the 18V to
110V input supply during startup. The switching fre-
quency is internally trimmed to 275kHz ±10%, thus
reducing magnetics and filter component costs.
The MAX5019/MAX5020 are available in 8-pin SO
packages.
Warning: The MAX5019/MAX5020 operate with high
voltages. Exercise caution.
Applications
Telecom Power Supplies
Industrial Power Supplies
Networking Power Supplies
Isolated Power Supplies
Features
♦ Wide Input Range: (18V to 110V) or (13V to 36V)
♦ Isolated (without optocoupler) or Nonisolated
Power Supply
♦ Current-Mode Control
♦ Leading-Edge Blanking
♦ Internally Trimmed 275kHz ±10% Oscillator
♦ Low External Component Count
♦ Soft-Start
♦ High-Voltage Startup Circuit
♦ Pulse-by-Pulse Current Limiting
♦ Thermal Shutdown
♦ SO-8 Package
MAX5019/MAX5020
Current-Mode PWM Controllers with Integrated
Startup Circuit
________________________________________________________________ Maxim Integrated Products 1
GND
CS
1
2
8
7
V
CC
NDRVV
DD
FB
V+
8-SO
TOP VIEW
3
4
6
5
MAX5019/
MAX5020
SS_SHDN
Pin Configuration
Ordering Information
NDRV
V
IN
V
OUT
V
DD
V
CC
CS
FB
MAX5020
V+
SS_SHDN
GND
Typical Operating Circuit
19-2115; Rev 0; 7/01
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.
PART TEMP. RANGE PIN-PACKAGE
MAX5019CSA* 0°C to +70°C8-SO
MAX5019ESA* -40°C to +85°C8-SO
MAX5020CSA* 0°C to +70°C8-SO
MAX5020ESA* -40°C to +85°C8-SO
*See Selector Guide at end of data sheet.
MAX5019/MAX5020
Current-Mode PWM Controllers with Integrated
Startup Circuit
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 13V, a 10µF capacitor connects V
CC
to GND, V
CS
= 0, V+ = 48V, 0.1µF capacitor connected from SS_SHDN to GND, NDRV
= open circuit, V
FB
= 3V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°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.
V+ to GND……………………………………...……-0.3V to +120V
V
DD
to GND.………………………………….……….-0.3V to +40V
V
CC
to GND.………………….……………………-0.3V to +12.5V
FB, NDRV, SS_SHDN, CS to GND .……-0.3V to V
CC
+ 0.3V
V
DD
and V
CC
Current …………………...…………………..20mA
NDRV Current Continuous...………………………………….25mA
NDRV Current for Less than 1µs..………….…………….……±1A
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C) .………....471mW
Operating Temperature Range…………..……...-40°C to +85°C
Storage Temperature Range……………..…….-65°C to +150°C
Lead Temperature (soldering, 10s) ………………………+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SUPPLY CURRENT
I
V+(NS)
V
DD
= 0, V+ = 110V, driver not switching 0.8 1.6
V+ Supply Current
I
V+(S)
V+ = 110V, V
DD
= 0, FB = GND,
driver switching
1.6 3.0
mA
V+ Supply Current After Startup V+ = 110V, V
DD
= 13V, FB = GND 14 µA
I
VDD
(
NS
)
V
DD
= 36V, driver not switching 0.9 1.6
V
D D
S up p l y C ur r ent
I
VDD(S)
V
DD
= 36V, driver switching, FB = GND 2.1 3.0
mA
V+ Shutdown Current V
SS_SHDN
= 0, V+ = 110V 180 290 µA
V
DD
Shutdown Current V
SS_SHDN
= 0 4 20 µA
PREREGULATOR/STARTUP
V+ Input Voltage 18 110 V
V
DD
Supply Voltage 13 36 V
INTERNAL REGULATORS (V
CC
)
Powered from V+, I
CC
= 7.5mA, V
DD
= 0 7.5 9.8 12.0 V
V
CC
Output Voltage
Powered from V
DD
, I
CC
= 7.5mA 9.0 10.0 11.0 V
V
CC
Undervoltage Lockout V
CC_UVLO
V
CC
falling 6.6 V
OUTPUT DRIVER
Peak Source Current V
CC
= 11V (externally forced) 570 mA
Peak Sink Current V
CC
= 11V (externally forced) 1000 mA
NRDV High-Side Driver
Resistance
R
OH
V
CC
= 11V, externally forced,
NDRV sourcing 50mA
412Ω
NDRV Low-Side Driver
Resistance
R
OL
V
CC
= 11V, externally forced,
NDRV sinking 50mA
1.6 4 Ω
ERROR AMPLIFIER
FB Input Resistance R
IN
50 kΩ
FB Input Bias Current I
FB
V
FB =
V
SS_SHDN
±1 µA
Error Amplifier Gain (Inverting) A
VCL
-20 V/V
Closed-Loop 3dB Bandwidth 200 kHz
FB Input Voltage Range 23V
MAX5019/MAX5020
Current-Mode PWM Controllers with Integrated
Startup Circuit
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
DD
= 13V, a 10µF capacitor connects V
CC
to GND, V
CS
= 0, V+ = 48V, 0.1µF capacitor connected from SS_SHDN to GND, NDRV
= open circuit, V
FB
= 3V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SLOPE COMPENSATION
Slope Compensation
(MAX5019 only)
V
SCOMP
26 mV/µs
THERMAL SHUTDOWN
Thermal Shutdown Temperature 150 °C
Thermal Hysteresis 25 °C
CURRENT LIMIT
CS Threshold Voltage V
ILIM
FB = GND 419 465 510 mV
CS Input Bias Current 0 ≤ V
CS
≤ 2V, FB = GND -1 1 µA
Current Limit Comparator
Propagation Delay
50mV overdrive on CS, FB = GND 180 ns
CS Blanking Time FB = GND, only PWM comparator is blanked 70 ns
OSCILLATOR
Clock Frequency Range FB = GND 247 275 302 kHz
MAX5019, FB = GND 75 85
Max Duty Cycle
MAX5020, FB = GND 44 50
%
SOFT-START
SS Source Current I
SSO
V
SS_SHDN
= 0 2.0 4.5 6.5 µA
SS Sink Current 1.0 mA
Steady State Reference Voltage
at SS_SHDN
V
SS
_SHDN No external load 2.331 2.420 2.500 V
V
SS_SHDN
falling 0.25 0.37 0.41
Shutdown Threshold
V
SS_SHDN
rising 0.53 0.59 0.65
V
Typical Operating Characteristics
(V+ = 48V, V
DD
= 13V, CS = GND, NRDV is open circuit, T
A
= +25°C, unless otherwise noted.)
0.999
1.000
1.001
1.002
1.003
-40 0-20 20 40 60 80
V
SS_SHDN
vs. TEMPERATURE
(AT THE END OF SOFT-START)
MAX5019 toc01
TEMPERATURE (°C)
V
FB
= 4V
V
SS_SHDN
(V) (NORMALIZED TO V
REF
= 2.4V)
273
274
276
275
277
278
-40 0-20 20 40 60 80
NDRV FREQUENCY
vs. TEMPERATURE
MAX5019 toc02
TEMPERATURE (°C)
NDRV FREQUENCY (kHz)
FB = GND
80.4
80.6
80.5
80.8
80.7
80.9
81.0
-40 20 40-20 0 60 80
MAX5019
MAXIMUM DUTY CYCLE
vs. TEMPERATURE
MAX5019 toc03
TEMPERATURE (°C)
MAXIMUM DUTY CYCLE (%)
FB = GND
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX5020ESA+T

Mfr. #:
Buy MAX5020ESA+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers w/Integrated Startup
Lifecycle:
New from this manufacturer.
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