MAX5003EEE-T Maxim Integrated Products, MAX5003EEE-T Datasheet - Page 16

• Manufacturer Part Number: MAX5003EEE-T
• Description: Voltage Mode PWM Controllers PWM Power-Supply Controller
• Manufacturer: Maxim Integrated Products

Specifications of MAX5003EEE-T

• Topology: Flyback, Forward
• Output Current: 1000 mA
• Switching Frequency: 300 KHz
• Duty Cycle (max): 75 %
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: QSOP-16
• Mounting Style: SMD/SMT
• Synchronous Pin: Yes

stress on the switch. A FET with the lowest total charge
and the lowest R
expected (plus some safety factor) is the best choice.
The choice of package is a function of the application,
the total power, and the cooling methods available.
Transformer parameters, once calculated in the design
process, can be used to find standard parts whenever
possible. The most important factors are the saturation
current, primary inductance, leakage inductance turns
ratio, and losses. Packaging and EMI generation and
susceptibility are closely connected, and must be con-
sidered. In general, parts with exposed air gaps (not
contained inside the magnetic structure) will generate
the most radiated EMI, and might need external shield-
ing. If the design is in high-voltage power supplies, the
insulation specifications are also important. Pay close
attention if the circuitry is galvanically connected to the
mains at any point, since serious safety and regulatory
issues might exist.
As in any high-frequency power circuit, the capacitors
used for filtering must meet very low ESR and ESL
requirements. At the 300kHz frequency (of which the
MAX5003 is capable), the most favorable technologies
are ceramic capacitors and organic semiconductor (OS
CON) capacitors. The temperature dependence of the
capacitance value and the ESR specification is important,
particularly if the ESR is used as part of the compensation
network for the feedback loop. If using through-hole-
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2002 Maxim Integrated Products
High-Voltage PWM
Power-Supply Controller
Table 1. Component Manufacturers
Power FETs
Current-Sense Resistors
Diodes
Transistors
Capacitors
Coils
DEVICE TYPE
DS(ON
) for the maximum drain voltage
International Rectifier
Fairchild
Dale-Vishay
Motorola
Central Semiconductor
Central Semiconductor
Sanyo
Taiyo Yuden
AVX
Coiltronics
MANUFACTURER
Printed USA
Transformer
Capacitors
mounted parts, keep lead length as short as practical.
Components with specifications for switching power con-
verters are preferred. Decoupling capacitors must be
mounted close to the IC.
The choice of rectifier diodes depends on the output
voltage range of the particular application. For low-volt-
age converters, the diode drop is a significant portion
of the total loss, and must be kept to a minimum. In
those cases, Schottky diodes are the preferred compo-
nent for the design. At higher voltages, ultra-fast recov-
ery diodes must be used, since Schottky components
will not satisfy the reverse voltage specification.
For all cases, the specifications to be determined
before choosing a diode are the peak current, the aver-
age current, the maximum reverse voltage, and the
maximum acceptable rectification losses. Once a type
is identified, a thermal analysis of the diode losses vs.
total thermal resistance (from junction to ambient) must
be carried out if the total power involved is significant.
Industrial-frequency (60Hz) rectifiers are not recom-
mended for any function in these converters, due to
their high capacitance and recovery losses. If using
overdimensioned rectifiers, the junction capacitance
influence must be reviewed.
TRANSISTOR COUNT: 1050
SUBSTRATE CONNECTED TO GND
___________________Chip Information
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