View MAX5022EVKIT_306580.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-2073; Rev 1; 10/01
MAX5022 Evaluation Kit
General Description
The MAX5022 evaluation kit (EV kit) is a fully assembled and tested 5W flyback converter circuit board. The power supply is configured for an isolated +5VDC output voltage that can supply up to 1A of current. The line input voltage range is from 85VAC to 265VAC or 120VDC to 375VDC. The MAX5022 EV kit demonstrates high efficiency up to 80% at 262kHz switching frequency. This high efficiency is achieved by using a single transistor (MOSFET), flyback-converter topology providing output power up to 5W. The surface-mount transformer has a tertiary winding to power the MAX5022 IC after startup. An optocoupler along with the transformer provide input-to-output isolation up to 4500VDC. Warning: The MAX5022 EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or the power sources connected to it must be careful to follow safety procedures appropriate for working with high-voltage electrical equipment. Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.
Features
o 85VAC to 265VAC or 120VDC to 375VDC Input Range o Isolated Output Voltage: +5VDC at 1A o Input-to-Output Isolation Up to 4500VDC o Fully Assembled and Tested o Efficiency Up to 80% o 2% Output Voltage Regulation Over Line and Load
Evaluates: MAX5022
Ordering Information
PART MAX5022EVKIT TEMP RANGE 0C to +70C IC PACKAGE SOT23-6
Component List
DESIGNATION C1, C9 QTY 2 DESCRIPTION 10.0F, 20%, 400V aluminum electrolytic capacitors (12.5 x 13.5) Sanyo 400CV10FS 0.22F, 20%, 50V X7R ceramic capacitors (1206) Taiyo Yuden UMK316BJ224ML 47F, 20%, 6.3V POSCAP capacitors (CASE V) Kemet A700V476M006AT 0.01F, 10%, 16V X7R ceramic capacitor (0402) Taiyo Yuden EMK105BJ103KV 0.1F, 10%, 16V X7R ceramic capacitor (0603) Taiyo Yuden EMK107BJ104KA DESIGNATION C7 QTY 1 DESCRIPTION 1000pF, 20%, 4kVAC, X1/Y1 rated capacitor (DE0910) Murata DE0910E102M-KX 8200pF, 10%, 50V X7R ceramic capacitor (0603) TDK C1608X7R1H822K 1000pF, 10%, 630V X7R ceramic capacitor (1206) TDK C3216X7R2J102K 250mA, 75V, high-speed switching diode (SOT23) Central Semiconductor Corp CMPD914 3A, 40V, Schottky power rectifier (SMC) Central Semiconductor CMSH3-40
C2, C3
2
C8
1
C4, C10
2
C11
1
C5, C12
2
D1
1
C6
1
D2
1
________________________________________________________________ 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.
MAX5022 Evaluation Kit Evaluates: MAX5022
Component List (continued)
DESIGNATION QTY DESCRIPTION 1000V, 1A, full wave diode bridge (SMDIP) Central Semiconductor CBR1D100S 600V, 1A ultrafast rectifier (SMA) Central Semiconductor CMR1U-06M 1/4A, 250V SLO-BLO fuse Littelfuse 203.250G Ferrite beads 220 at 100MHz, 2A DCR = 0.025 (0805) Murata BLM21P221SG 470H, 240mA inductor Sumida CDRH73-471 2A, 600V, N-channel MOSFET (DPAK) International Rectifier IRFRC20 360k 5% resistors (1206) 1.0k 1% resistor (0805) 24.9k 1% resistor (0805) 8.06k 1% resistor (0805) 10 5% resistor (0603) 1.78 1%, resistor (1206) 1.2k 5% resistor (1206) DESIGNATION R9 R10 R11 R12 TB1 QTY 1 1 1 1 1 DESCRIPTION 240k 5% resistor (0805) 10 5% resistor (0805) 1.5k 1% resistor (0603) 100k 5% resistor (1206) 2-point terminal block (0.2in center) Mouser 506-2MV02 480H (primary:secondary:tertiary turns ratio 60:3:8), 5W transformer Cooper Electronic Technologies CTX03-15256 MAX5022EUT (6-pin SOT23) 70V, 100% to 200% CRT 5300VAC isolation phototransistor (DIP-6) Fairchild CNY17-3.W 1.24V precision shunt regulator (SOT23-5L) Texas Instruments TLV431AIDBV Rubber bumpers 3M SJ-5003 MAX5022 PC board MAX5021/MAX5022 data sheet MAX5022 EV kit data sheet
D3
1
D4
1
F1
1
T1
1
L1, L3
2
U1 U2
1 1
L2
1
N1 R1, R2 R3 R4 R5 R6 R7 R8
1 2 1 1 1 1 1 1
U3
1
None None None None
4 1 1 1
Component Suppliers
SUPPLIER Central Semiconductor Cooper Electronic Fairchild Semiconductor International Rectifier Kemet Littelfuse Murata Sanyo USA Sumida USA Taiyo Yuden TDK PHONE 631-435-1110 561-752-5000 888-522-5372 310-322-3331 864-963-6300 847-824-1188 770-436-1300 619-661-6835 847-545-6700 408-573-4150 847-803-6100 FAX 631-435-1824 561-742-0134 972-910-8036 310-252-7175 864-963-6322 847-391-0894 770-436-3030 619-661-1055 847-545-6720 408-573-4159 847-390-4405
Quick Start
The MAX5022 EV kit is fully assembled and tested. Follow these steps to verify board operation. Warning: Exercise CAUTION when connecting and measuring off-line voltages. * Voltage at the primary side may be as high as 700VDC. * * * * Do not turn on the power supply until all connections are completed. Wear protective eye gear at all times. Do not touch any part of the circuit with bare hands or conductive materials while power is applied. Make sure all high-voltage capacitors are fully discharged before handling.
Note: Please indicate that you are using the MAX5022 when contacting these component suppliers.
2
_______________________________________________________________________________________
MAX5022 Evaluation Kit
Recommended Equipment
* * * Isolation transformer Variac Voltmeter
Detailed Description
The MAX5022 EV kit is an off-line 5W flyback converter, configured for +5VDC/1A output. A tertiary winding from the transformer is used to power the device during normal operation. The secondary winding provides the +5VDC output and can supply up to 1A. This EV kit uses the MAX5022, a SOT23, current-mode, pulse width modulating (PWM) controller. This PWM controller varies the duty cycle to compensate for the variation in VIN and the output load to maintain a constant output voltage. The duty cycle determines the on/off duration of the MOSFET (N1). The N-channel MOSFET is used as a switch to control the current through the primary winding of the transformer (T1). The duty cycle is controlled by the feedback loop consisting of voltage-divider resistors (R4, R5), a shunt regulator (U3), an optocoupler (U2), and the PWM comparator inside the MAX5022. This network provides the isolated feedback, regulating the output voltage to 5V 2% with up to 4500VDC input-to-output isolation. The MAX5022 senses the current going through the transformer's primary winding with a current-sense resistor (R7), and shuts down the output when the output current exceeds the current limit of 1.6A. The MAX5022 EV kit is protected against catastrophic failure with the fuse (F1).
Evaluates: MAX5022
VOUT Setup Procedure
1) Connect the positive lead of a DC voltmeter to the VOUT pad. 2) Connect the negative lead of a DC voltmeter to the GND pad. 3) Make sure that the isolation transformer is not powered up. Connect the variac to the output of the isolation transformer. 4) Connect one lead of an AC voltmeter to the wiper terminal of the variac. 5) Connect the other lead of the AC voltmeter to the "common" terminal of the variac. 6) Set the output voltage of the variac to 0VAC. 7) Connect the wiper terminal of the variac to the L terminal of TB1. 8) Connect the "common" terminal of the variac to the N terminal of TB1. 9) Connect a 50 1W resistor across the output. 10) Power up the isolation transformer, and gradually increase the voltage of the variac to 85VAC and up to 265VAC. 11) Verify that VOUT is +5V throughout the input voltage range of 85VAC to 265VAC.
MAX5022 EFFICIENCY
90 80 70 EFFICIENCY (%) 60 50 40 30 20 10 0 VIN = 85VAC VIN = 120VAC VIN = 265VAC 0 100 200 300 400 500 600 700 800 900 1000 OUTPUT CURRENT (mA)
Figure 1. Efficiency Graph
_______________________________________________________________________________________
3
Evaluates: MAX5022
MAX5022 Evaluation Kit
Figure 2. MAX5022 EV Kit Schematic
AC 3 1 R8 1.2k AC 4 D4 C1 10F 400V C9 10F 400V 3 5 D1 L3 C7 1000pF C2 0.22F C5 0.01F U3 4 VCC VIN 5 3 5 4 R5 8.06k 1% 2 1 R4 24.9k 1% U2-A R10 10 6 789 R3 1k 1% R2 360k C4 47F 6.3V C6 0.1F R1 360k D2 L1 C10 47F 6.3V R12 100k T1 CTX03_15256 10 11 12 1 C11 1000pF L2 470H +5V VOUT D3 GND
4
U1
6 OPTO
TERMINAL BLOCK
F1
TB-1
TB-2
2
C3 0.22F 3 N1
U2-B NDRV R11 1.5k 1% C12 0.01F 2 GND C8 8200pF R6 10 CS 1 R7 1.78 1%
MAX5022
5
6
R9 240k
4
_______________________________________________________________________________________
NOTE: ALL RESISTORS ARE 5% UNLESS OTHERWISE SPECIFIED
PRIMARY GROUND
SECONDARY GROUND
MAX5022 Evaluation Kit Evaluates: MAX5022
1.0"
Figure 3. MAX5022 EV Kit Component Placement Guide--Component Side
1.0"
Figure 4. MAX5022 EV Kit PC Board Layout--Component Side
1.0"
Figure 5. MAX5022 EV Kit PC Board Layout--Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 5 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX5022EVKIT

	To Download MAX5022EVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .