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Download Dreambox DM500 docs - Satellite tv, digital satellite receivers, satellite descrambler,DVB and other satellite equipment service manual and repair information| File information: | | File name: | Schematic_diagram_DM500.rar
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LT1940 Dual Monolithic 1.4A, 1.1MHz Step-Down Switching Regulator August 2002 DESCRIPTIO
The LT®1940 is a dual current mode PWM step-down DC/DC converter with internal 2A power switches. Both converters are synchronized to a single 1.1MHz oscillator and run with opposite phases, reducing input ripple current. The output voltages are set with external resistor dividers, and each regulator has independent shutdown and soft-start circuits. Each regulator generates a powergood signal when its output is in regulation, easing power supply sequencing and interfacing with microcontrollers and DSPs. The LT1940's 1.1MHz switching frequency allows the use of tiny inductors and capacitors, resulting in a very small dual 1.4A output solution. Constant frequency and ceramic capacitors combine to produce low, predictable output ripple voltage. With its wide input range of 3.6V to 25V, the LT1940 regulates a wide variety of power sources, from 4-cell batteries and 5V l | | A.pdf | | 1 2 3 4 5 6
U5-E
46 55
IDDQ VSSA
58 68
+3.3V CPU0 VSSA
59 72
| | AX88796LF.pdf | | AX88796 L 3-in-1 Local Bus Fast Ethernet Controller
10/100BASE 3-in-1 Local CPU Bus Fast Ethernet Controller with Embedded SRAM
Document No.: AX796-17 / V1.7 / Jan. 25 '02
Features
· · · · · · · · · · Highly integrated with embedded 10/100Mbps MAC, PHY and Transceiver Embedded 8K * 16 bit SRAM Compliant with IEEE 802.3/802.3u 100BASE-TX/FX specification NE2000 register level compatible instruction Single chip local CPU bus 10/100Mbps Fast Ethernet MAC Controller Support both 8 bit and 16 bit local CPU interfaces include MCS-51 series, 80186 series and MC68K series CPU Support both 10Mbps and 100Mbps data rate Support both full-duplex or half-duplex operation Provides an extra MII port for supporting other media. For example, Home LAN application Support EEPROM interface to store MAC address · · · · · · External and internal loop-back capability Support Standard Print Port for printer server application Support upto 3/1 General Purpose In/Out pins 128-pin LQFP low profile package Low P | | B.pdf | | 1
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+3.3V U30 C300 54 52 46 41 28 12 6 38 21 58 35 38 36 19 29 30 17 31 16 61 15 79 60 33 34 R300 000 C301 40 36 20 19 39 23 24 25 26 29 30 31 32 33 34 22 35 +3.3V +3.3V +3.3V +3.3V +3.3V +3.3V +3.3V MEN1-CKE MEN1-CLK MEN1-CDQM MEN1-WE MEN1-BA1 MEN1-CAS NC MEN1-RAS A12 MEN1-ADDQ0 MEN1-BA0 MEN1-ADDQ1 MEN1-CS MEN1-ADDQ2 MEN1-CDQN MEN1-ADDQ3 MEN1-ADDR0 MEN1-ADDQ4 MEN1-ADDR1 MEN1-ADDQ5 MEN1-ADDR2 MEN1-ADDQ6 MEN1-ADDR3 MEN1-ADDQ7 MEN1-ADDR4 MEN1-ADDQ8 MEN1-ADDR5 MEN1-ADDQ9 MEN1-ADDR6 MEN1-ADDQ10 MEN1-ADDR7 MEN1-ADDQ11 MEN1-ADDR8 MEN1-ADDQ12 MEN1-ADDR9 MEN1-ADDQ13 MEN1-ADDR10 MEN1-ADDQ14 MEN1-ADDR11 MEN1-ADDQ15 HY57V561620CT-H GND GND GND GND GND GND GND 1 3 9 14 27 43 49 37 15 16 17 18 2 4 5 7 8 10 11 13 42 44 45 47 48 50 51 53
+3.3V U31 1 3 9 14 27 43 49 37 15 16 17 18 2 4 5 7 8 10 11 13 42 44 45 47 48 50 51 53 +3.3V GND +3.3V GND +3.3V GND +3.3V GND +3.3V GND +3.3V GND +3.3V GND CKE NC LDQM A12 MEM-WE BA1 CAS MEM-CLK RAS ADDQ0 ADDQ1 BA0 ADDQ2 CS ADDQ3 UDQM ADDQ4 ADDR-0 ADDQ | | C.pdf | | 1 2 3 4
C413 C412
+5V R401 104 104
104
D R410 D
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U22 R201 C212 C239 C240 C241
U21 C211 C210 +3.3V
R200 LM1117 1240±1%
D LM1117 | | E.pdf | | 1 2 3 4 5 6
+3.3V
+3.3V
L104
PB2012-121
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C719
LNB 13/18V 102
D70
1N4007 DO-41
| | LM1117 1.8.pdf | | LM1117 800mA Low-Dropout Linear Regulator
February 2000
LM1117 800mA Low-Dropout Linear Regulator
General Description
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor's industry standard LM317. The LM1117 is available in an adjustable version, which can set the output voltage from 1.25V to 13.8V with only two external resistors. In addition, it is also available in five fixed voltages, 1.8V, 2.5V, 2.85V, 3.3V, and 5V. The LM1117 offers current limiting and thermal shutdown. Its circuit includes a zener trimmed bandgap reference to assure output voltage accuracy to within ± 1%. The LM1117 series is available in SOT-223, TO-220, and TO-252 D-PAK packages. A minimum of 10µF tantalum capacitor is required at the output to improve the transient response and stability.
Features
n Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions n Space Saving SOT-223 Package n Curren | | LT1930f.pdf | | FEATURES
s s s s s s s s s s s
LT1930/LT1930A 1A, 1.2MHz/2.2MHz, Step-Up DC/DC Converters in ThinSOT DESCRIPTIO
The LT®1930 and LT1930A are the industry's highest power SOT-23 switching regulators. Both include an internal 1A, 36V switch allowing high current outputs to be generated in a small footprint. The LT1930 switches at 1.2MHz, allowing the use of tiny, low cost and low height capacitors and inductors. The faster LT1930A switches at 2.2MHz, enabling further reductions in inductor size. Complete regulator solutions approaching one tenth of a square inch in area are achievable with these devices. Multiple output power supplies can now use a separate regulator for each output voltage, replacing cumbersome quasi-regulated approaches using a single regulator and custom transformers. A constant frequency internally compensated current mode PWM architecture results in low, predictable output noise that is easy to filter. Low ESR ceramic capacitors can be used at the output, further re |
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