MAX796 MAX667 MAX796 MAX797 MAX799

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MAX796 MAX667 MAX796 MAX797 MAX799

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MAX796 Evaluation
MAX796 evaluation kit) preassembled tested demonstration board that generates 15V. features flyback transformer rather than simple inductor, providing extra output with very little added cost. This loosely regulated output normally post-regulated with linear regulator such MAX667, order generate programming voltages flash memory PCMCIA sockets. board comes configured accept battery voltages between 6.5V 28V, reconfigured voltages between 5.7V reducing expectation secondary load-current capability voltages (60mA) substituting MOSFETs with higher breakdown voltage ratings. standard board guaranteed deliver least load current main output 120mA minimum secondary output (VSEC 13V). modify load-current capability, change sense-resistor (R1) value re-size external components according Design Procedure MAX796/MAX797/ MAX799 data sheet. main output voltage comes preset 5.08V (nominal). select 3.3V operation, move jumper position 2-3. operation adjustable mode, install resistors remove jumper. There small trace jumper that shunts board. This default jumper must apart either adjustable-mode fixed 3.3V operation. Don't operate circuit jumper resistor divider been installed, this will damage output overvoltage. sure change transformer turns ratio secondary feedback resistor divider changed. addition standard components, some extra pull-up pull-down resistors (R2-R8) default logic input levels. These resistors usually omitted final design. There also optional noise filter current-sense leads that needed with some transformer types. main output becomes noisy when secondary output heavily loaded, noise filter should left installed. MAX796 used evaluate MAX799 replacing re-wiring transformer secondary. Changes needed include connecting SECFB resistor divider instead GND, changing transformer, reversing secondary rectifier (D3) filter capacitor (C7) polarities.
Battery Range: 6.5V Load Capability: +3.3V +15V 150mA Precision 2.505V Reference Output Oscillator SYNC Input Secondary Winding Regulation
Evaluates: MAX796/MAX799
_Ordering Information
MAX796EVKIT-SO VOUT +5V/+15V (dual) BOARD TYPE Surface Mount
_MAX796
_Maxim Integrated Products
Call toll free 1-800-998-8800 free samples literature.
MAX796 Evaluation Evaluates: MAX796/MAX799
_Component List
DESIGNATION DESCRIPTION 22µF, low-ESR capacitors TPSE226M035R0300 Sprague 595D226X0035R2T 220µF, low-ESR capacitors TPSE227M010R0100 Sprague 595D227X0010R2T 0.1µF ceramic capacitors 4.7µF, tantalum capacitor Sprague 595D475X0016A2T 0.33µF ceramic capacitor 0.01µF ceramic capacitor 22µF, low-ESR capacitor TPSD226M025D0200 Sprague 595D226X0025D2T 4700pF ceramic capacitor Leave this site empty Schottky diode Motorola MBRS140T3 Nihon EC10QS04 International Rectifier 10BQ040 100mA, Schottky diode Central Semiconductor CMPSH-3 Motorola MBR0530 100V fast-recovery diode Nihon EC11FS1 Motorola MBRS1100T3 250mW, zener diode Central Semiconductor CMPZ5248B Motorola MMBZ5248B logic-level N-channel MOSFETs Motorola MMSF5N03HD International Rectifier IRF7201 Siliconix Si9410 0.020 sense resistor Dale WSL-2010-R020-F LR2010-R020-F 210k, resistor 49.9k, resistor Leave these sites open resistor 100k, resistor resistor Transformer (1:2.2 turns ratio) Dale LPE-6562-A092 Transpower TTI-5870 Maxim MAX796CSE
_Quick Start
Connect stiff (20W better) bench power supply pads found edge board. Check that jumpers correctly installed, both position 1-2). Turn input voltage somewhere between 4.75V 28V. Verify that main output regulating that secondary output Normal full-load regulation -2.5% while keeping main output tolerance. measured error higher, there drops wiring ground. Ensure that voltmeter sensing directly output ground pads board. observe normal switching action, place load main output observe switching node (device pin) with oscilloscope while varying input voltage. Without load, switching waveforms intermittent difficult trigger appear that board isn't working. Jumper comes installed 300kHz operation. Component values need changed 150kHz operation selected; Design Procedure section MAX796/MAX797/MAX799 data sheet. oscillator synchronized external clock signal driving SYNC with pulse train amplitude.
Table Pull-Up/Down Resistors
RESISTOR FUNCTION Adjustable-mode resistor dividers, installed. VOUT 2.505V R4/R5). Current-sense noise filter resistor (optional). 100k SYNC pull-up resistor, usually shorted (SYNC REF). SHDN pull-down resistor, usually shorted (SHDN V+).
Table Jumper Connections
JUMPER FUNCTION On/off control. Remove force shutdown mode. Output voltage select. Install position 3.3V. Frequency select. Install position 300kHz, 150kHz.
Table MAX796/MAX797/MAX799 data sheet component supplier phone/fax numbers.
MAX796 Evaluation Evaluates: MAX796/MAX799
22µF, 22µF, 0.1µF ON/OFF 100k SHDN SECFB
6.5V OUTPUT (+5V 5mA) 4.7µF 0.1µF 1:2.2 49.9k, 4700pF 210k, +15V 250mA
22µF
MAX796
PGND
OPEN 220µF 220µF
4700pF
DEFAULT
SYNC
DEFAULT OPEN
SYNC
0.01µF
0.33µF OUTPUT (+2.505V 100µA)
Figure MAX796 Schematic
Figure MAX796 Component Placement Guide- Component Side
MAX796 Evaluation Evaluates: MAX796/MAX799
Figure MAX796 Component Placement Guide- Solder Side
Figure MAX796 Board Layout-Component Side
Figure MAX796 Board Layout-Solder Side
Figure MAX796 Board Layout-Interior Groundplane
Maxim cannot assume responsibility circuitry other than circuitry entirely embodied Maxim product. circuit patent licenses implied. Maxim reserves right change circuitry specifications without notice time.
_Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 (408) 737-7600 1994 Maxim Integrated Products Printed registered trademark Maxim Integrated Products.

MAX796 MAX667 MAX796 MAX797 MAX799

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