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Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp
POWER MANAGEMENT Description
The SC4812 is a highly integrated current mode PWM controller designed for isolated or non-isolated dc-dc converters in telecommunication and data communication applications. It minimizes the amount of external discrete components needed and leads to substantial cost and space saving converter designs. The circuitry of the SC4812 includes an integrated high voltage start-up circuit suitable for telecom/industrial voltage applications. It is disabled during regular operation and improves efficiency. Current mode control with leading-edge blanking simplifies control loop design and internal ramp compensation circuit stabilizes the current loop when operating above 50% duty cycle. Internal error amplifier could be used for non-isolated applications.
SC4812
Features
Wide input range 12V to 90V High-voltage start-up circuit Current mode control Transconductance error amplifier Leading-edge blanking Cycle by cycle current limit Programmable external soft-start Thermal shutdown SO-8 package. Fully WEEE and RoHS compliant
Applications
IP phones, PoE Telecom isolated converters Off-line isolated power supplies Instrumentation power supplies Battery chargers
Typical Application Circuit
Vin
T1 C2 C3 R2 1 U1
D1 C1
Vout
R1
C4
VIN
VCC
8
Q1 7 5 6 R5
2 3 C5 R3 R4 4 C6
FB SC4812 COMP SS/SHDN
OUT CS GND
Revision: February 6, 2007
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SC4812
POWER MANAGEMENT Pin Configuration
TOP VIEW
Ordering Information
Part Number SC4812STRT(1)(2) Top Mark S C 4812 P ackag e SO-8
VIN FB COMP SS/SHDN
(SO - 8 PIN)
VCC OUT GND CS
S C 4812E V B
Evaluation Board
Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free product. This product is fully WEEE and RoHS compliant.
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.
Parameter Input Voltage Supply Voltage Supply Current FB, COMP, CS, and SS/SHDN to GND OUT Peak Current Continuous Power Dissipation Junction Temperature Range Thermal Resistance
(1)
Symbol VIN V CC ICC
Maximum -0.5 to 100 -0.5 to 18 20 -0.5 to 7 1
Units V V mA V A W C C/W C C
PD TJ JA TSTG TLEAD
Internally limited -40 to +150 105 -65 to +150 +300
Storage Temperature Range Lead Temperature (Soldering) 10 Sec.
Note: (1) Mounted to 3" x 4.5", 4 layer FR4 PCB in still air per JESD51 standards.
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SC4812
POWER MANAGEMENT Electrical Characteristics
Unless specified: VCC = 12V, a 10uF capacitor connects VCC to GND, VCS = 0, VIN = 48V, a 0.1uF capacitor connects SS/SHDN to GND, OUT = open circuit, FB = GND, TA = TJ = -40 to +125C. Typical values are at TA = 25C
Parameter Startup/Winding Regulator VIN Input Voltage Range VIN Supply Current
Test Conditions
Min
Typ
Max
Unit
12 VIN = 90V, VCC open, driver switching VIN = 90V, VCC open, VFB = 3V, driver not switching 5 3.5 50 250 6.8 12 7.4 20
90 7.5 5 100 380 8
V mA mA A A V mA
VIN Supply Current after Startup VIN Shutdown Current VCC Output Voltage VCC Current Limit VCC Supply VCC Turn-on Voltage Hysteresis Operating Current VCC Zener Shunt Voltage Error Amplifier Feedback Input Voltage Feedback Input Voltage Regulation Input Bias Current Amplifier Transconductance Amplifier Source Current Amplifier Sink Current Open Loop Voltage Gain PWM Comparator Slope Compensation Oscillator Clock Frequency Range Max Duty Cycle
VIN = 90V VIN = 90V, VSS/SHDN = 0 Power from VIN 10% below no load VCC output voltage
6 0.8
6.5 1 3
6.7 1.4 7.5 17.25
V V mA V
ICC = 10mA
15.25
16.25
close loop VCC = 8V to 14V
2.44 2.425
2.50
2.56 2.575
V V A mho A A dB
0.5 1000 110 110 60
0.8
28
mV/S
235 75
260 80
285 85
kHz %
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SC4812
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VCC = 12V, a 10uF capacitor connects VCC to GND, VCS = 0, VIN = 48V, a 0.1uF capacitor connects SS/SHDN to GND, OUT = open circuit, FB = GND, TA = TJ = -40 to +125C. Typical values are at TA = 25C
Parameter Current Limit CS Threshold Voltage CS Input Bias Current Propagation Delay to Gate CS Blanking Time Soft Start SS Source Current SS Sink Current Shutdown Threshold
Test Conditions
Min
Typ
Max
Units
419 0 V C S 2V -1
465
510 1
mV A nS nS
70 70
VSS/SHDN = 0
4
6 1
8
A mA
VSS/SHDN falling VSS/SHDN rising
0.25 0.61
0.5 0.7
0.6 0.8 V
Output Peak Source Current Peak Sink Current Rise Time Fall Time Thermal Shutdow n Thermal Shutdown Temperature Thermal Hysteresis 150 25 C C CL = 1nF CL = 1nF 570 1000 45 35 mA mA nS nS
Note: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
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SC4812
POWER MANAGEMENT Pin Descriptions
Pin # 1 2 3 Pin Name VIN FB COMP Pin Function High voltage startup input. Connect directly to an input voltage between 12 to 90V. Connects internally to a high voltage linear regulator that generates VCC during startup. Feedback input to the internal transconductance error amplifier. VFB sensed the regulated output voltage through an external resistor divider. Internal transconductance error amplifier output. Compensation network of the overall loop is placed between this pin and GND. Soft start timing capacitor connection. Ramp time to full current limit is approximately TBD ms/nF. This pin is also the reference voltage output. Bypass with a minimum 10nF capacitor to GND. The device goes into shutdown when VSS_SHDN is pulled below 0.25V. Current sense input. Turns power switch off if VCS rises above 465mV for cycle-by-cycle current limiting. CS is also the feedback for the current mode controller. CS is connected to the PWM comparator through a leading edge blanking circuit. Ground. Gate drive. Drives a high voltage external N-channel power MOSFET. Supply voltage. Provides power for entire IC. VCC is regulated from VIN during startup. Bypass VCC with a 10uF tantalum capacitor in parallel with 0.1uF ceramic capacitor to GND.
4
SS/SHDN
5 6 7 8
CS GND OUT VC C
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SC4812
POWER MANAGEMENT Block Diagram
7.4V
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SC4812
POWER MANAGEMENT Application Information
Introduction The SC4812 is a 8 pin peak current mode controlled PWM controller for isolated or non-isolated DC-DC switching power supplies. It features an internal startup regulator, programmable external soft start and programmable cycle -by-cycle current limit It operates in a fixed frequency at 260KHz. The SC4812 can be applied in a flyback or forward topology with the input voltage ranging from 36V to 75V. Startup Regulator The internal startup regulator of the SC4812 makes its initial startup without a lossy startup resistor or external startup circuitry to save cost and board space. As input voltage exceeds 12V, it provides regulated 7.4V to VCC which is with the maximum turn-on voltage 6.7V. Soft-Start/Shutdown and VCC Lockout During power startup, the output voltage has to ramp up in a controlled manner to avoid overshoot. The SC4812 internal non-inverting terminal to the error amplifier is connected to the soft-start pin, which forces the internal 2.5V reference to gradually ramp up during power startup. In a non-isolated application, as the internal error amplifier is used, output voltage of a converter ramps up with close loop startup fashion smoothly. In case of an isolated application in which the internal error amplifier may not be used, isolated voltage feedback is through an opto-coupler and connected to the COMP pin. During power startup, the COMP pin will follow the soft-start pin voltage through an internal diode. Soft-start operation begins when SS/SHDN ramps above 0.7V. When soft-start completed, SS/SHDN is regulated to 2.50V, the internal voltage reference. Pull SS/SHDN below 0.5V to disable the controller. Undervoltage lockout shuts down the controller when VCC is less than 5.5V. The internal startup regulator and the reference remain on during shutdown. Current-Sense The function of the CS pin is to limit the peak current through the MOSFET. Current is sensed at CS as a voltage across a sense resistor between the source of the MOSFET and GND. An RC filter is recommended to connect CS to the sense resistor to reduce effect of the MOSFET turn-on leading edge spike and noise. Select the current-sense resistor with the following equation: RS = 0.465V/(1.2xILIM_PRI) where, ILIM_PRI is the maximum peak primary-side current. When VCS > 465mV, the power MOSFET turns off after 70nS propagation delay from the switch current reaches the trip point to the driver. PWM Comparator and Slope Compensation The SC4812 runs fixed 260 KHz frequency by an internal oscillator. At the beginning of each switching cycle, the OUT pin switches the MOSFET on. the OUT pin switches off after the 80% maximum duty cycle has been reached, regardless of the feedback. Since an artificial slope is required for current-mode operation when duty cycle is larger than 50%, the SC4812 uses an internal ramp generator for slope compensation. The internal ramp signal is reset at the beginning of each cycle and slews at 26mV/S. The PWM comparator compares the instantaneous primary peak current to the feedback error signal through the opto-coupler, the internal offset and slope compensation and determine when to turn off the MOSFET. In steady state operation, the MOSFET turns off when: ILIM_PRI * RS > VOPTO - VOFFSET - VSLOPE where ILIM_PRI is the current on the primary side through the MOSFET. VOFFSET is 1.5V internal offset voltage and VSLOPE is the artificial ramp starting at with slew rate 26mV/
S.
When selecting an inductor in a forward-converter or magnetizing inductance in a flyback-converter, the following condition must be met to avoid control-loop subharmonic oscillations:
NS K x RS x VO x = 26mV / S NP L
where K = 0.5 TO 1, AND NS and NP are the turns of the main transformer on secondary and primary side respectively. L is the output inductor on secondary side in a forward-converter or magnetizing inductance on secondary side in a flyback-converter.
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SC4812
POWER MANAGEMENT Applications Information (Cont.)
PCB Layout Guideline PCB layout is very critical, and the following should be considered to insure proper operation of the SC4812. High switching currents are present in applications and their effect on ground plane must be understood and minimized. 1) The high power parts of the circuit should be placed on a board first. A ground plane should be used. Isolated or semi-isolated areas of the ground plane may be deliberately introduced to constrain ground currents to particular areas, for example the input capacitor and the main switch FET ground. 2) The loop formed by the Input Capacitor(s) (Cin), the main transformer and the main switch FET must be kept as small as possible. This loop contains all the high fast transient switching current. Connections should be as wide and as short as possible to minimize loop inductance. Minimizing this loop area will a) reduce EMI, b) lower ground injection currents, resulting in electrically "cleaner" grounds for the rest of the system and c) minimize source ringing, resulting in more reliable gate switching signals. 3) The connection between FETs and the main transformer should be a wide trace or copper region. It should be as short as practical. Since this connection has fast voltage transitions, keeping this connection short will minimize EMI. 4) The output capacitor(s) (Cout) should be located as close to the load as possible. Fast transient load currents are supplied by Cout only. Connections between Cout and the load must be short, wide copper areas to minimize inductance and resistance. 5) A 0.1uF to 1uF ceramic capacitor should be directly connected between VCC and GND and a 1uF to 4.7uF. The SC4812 is best placed over a quiet ground plane area. Avoid pulse currents in the Cin and the main switch FET loop flowing in this area. GND should be returned to the ground plane close to the package and close to the ground side of (one of) the VCC supply capacitor(s). Under no circumstances should GND be returned to a ground inside the Cin and the main switch FET loop. This can be achieved by making a star connection between the quiet GND planes that the SC4812 will be connected to and the noisy high current GND planes connected to the FETs. 6) The feed back connection between the error amplifier and the FB pin should be kept as short as possible, and the GND connections should be to the quiet GND used for the SC4812. 7) If an opto-coupler is used for isolation, quiet primary and secondary ground planes should be used. The same precautions should be followed for the primary GND plane as mentioned in item 5. For the secondary GND plane, the GND plane method mentioned in item 4 should be followed. 8) All the noise sensitive components such as VCC bypass capacitor, COMP resistor/capacitor network, current sensing circuitry and feedback circuitry should be connected as close as possible to the SC4812. The GND return should be connected to the quiet SC4812 GND plane. 9) The connection from the OUT of the SC4812 should be minimized to avoid any stray inductance. If the layout can not be optimized due to constraints, a small Schottky diode may be connected from the OUT pin to the ground directly at the IC. This will clamp excessive negative voltages at the IC.
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1
8
VIN
2 OUT TP7 4 R10 3 2 U3 2 1 3 R21 open 100 C13 1nF R12 0.5 R16 0.5 1 CS GND 5 3 4
VCC
4
6
C12 1nF SC4812
SS/SD
2007 Semtech Corp.
TP12 D1 1N4148WS R17 2 D2 SL43 1 4 R4 330 3 C8 10uF/16V TP4 R6 2.4K R7 180 R8 open U2 PS2521L-1 C10 15nF R9 3.32K 1 TP6 2 5 7 M1 Si3440 6 C15 open R18 open C9 150pF 9 10 C3 470uF/6.3V C4 470uF/6.3V C6 1uF R15 0 8 7 TP1 TP2 10 R1 open C1 open C2 1uF T1 PA1269
36-75V
TP13
3.3V/4A RTN
GND
C5 22uF/100V
D3 1N4148WS
U1
R11
POWER MANAGEMENT SC4812 Evaluation Board - Schematics( Isolated Flyback )
9
D6 1N4148WS TP8 TP9 C25 2.2nF/630V TP10 TP11
2.4K
FB
TP5
3
COMP
C14 0.47uF
SC431L R14 2.0K
SC4812
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SC4812
POWER MANAGEMENT SC4812 Evaluation Board - BOM( Isolated Flyback )
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Qty. 2 2 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 2 1 2 1 1 1 1 1 Reference C2,C6 C3,C4 C5 C8 C9 C10 C12 C13 C14 C25 D1,D3,D6 D2 M1 R4 R6 R7 R9 R10 R11 R12,R16 R14 R15,R21 R17 T1 U1 U2 U3 Part/Value 1uF/6.3V 470uF/6.3V 22uF/100V 10uF/16V 150pF 15nF 1nF 1000pF 0.1uF 2.2nF/630V 1N4148WS SL43 Si3440 330 2.4K 180 3.32K 100 10K 0.5 2.0K 0 10 PA1269 SC4812 PS2521L-1 SC431L Manufacturer Kemet Sanyo Panasonic-ECG TDK muRata Panasonic-ECG Vishay Vishay Vishay TDK Vishay Vishay Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Susumu Yageo America Vishay Yageo America Pulse Eng. Semtech NEC Semtech Manufacturer P.N. C0805C105M9PAC3810 6TPB470M ECA-2AHG220 C3216X7R1C106MT GRM2165C2A151JA01 ECJ-2VB1H153K VJ0805Y102KXXAT VJ0805Y102KXXAT VJ0805Y104KXXxx C3216X7R2J222K 1N4148WS-V-GS08 SL43 SI3440DV-T1-E3 CRCW0805330RFKEA CRCW08052K40FKEA CRCW0805180RFKEA CRCW08053K32FKEA ERJ-6ENF1000V CRCW080510K0FK RL1220S-R50-F 9C08052A2001FKHFT CRCW08050000ZSTA 9C08052A10R0FKHFT PA1269 SC4812STRT PS2521L-1 SC431LCSK
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1
VIN
2 OUT TP7 CS GND 100 C13 1nF R12 0.25 R16 0.25 5 R10 3 4
VCC
4
6
C12 1nF C14 0.47uF U1 SC4812
SS/SD
POWER MANAGEMENT SC4812 Evaluation Board - Schematics( Non-Isolated Flyback )
11
8 TP6 2 5 7 M1 Si3440
2007 Semtech Corp.
TP12 D1 1N4148WS R17 2 D2 SL43 1 4 R4 330 3 C8 10uF/16V TP4 C9 150pF 9 10 C3 470uF/6.3V C4 470uF/6.3V C6 1uF 8 7 R15 0 TP1 TP2 10 R1 open C1 open C2 1uF T1 PA1269 TP13
36-75V
5V/2.6A RTN
GND
C5 22uF/100V
D3 1N4148WS 1 6
R9 1.0K
FB
TP5
3
COMP
R6 1K
R14 1.0K
C15 47nF
SC4812
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SC4812
POWER MANAGEMENT SC4812 Evaluation Board - BOM( Non-Isolated Flyback )
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Qty. 2 2 1 1 1 2 1 1 1 2 1 1 3 2 2 1 1 Reference C2,C6 C3,C4 C5 C8 C9 C12, C13 C14 C16 D1, D3 D2 M1 R4 R9, R13, R14 R10,R17 R12,R16 T1 U1 Part/Value 1uF/16V 470uF/6.3V 22uf/100V 10uF/16V 150pF/100V 1nF/16V 0.1uF/16V 47nF/16V 1N4148WS SL43 Si3440 330 1.0K 100 0.25 PA1260 SC4812 Manufacturer Panasonic-ECG Sanyo Panasonic-ECG TDK Panasonic-ECG Vishay Vishay Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Panasonic-ECG Pulse Semtech Manufacturer P.N. ECJ-2FB1C105K 6TPB470M ECA-2AHG220 C3216X7R1C106MT ECJ-2VC2A151x VJ0805Y102KXJPW1BC VJ0805Y104KXJAC VJ0805Y473KXJxx 1N4148WS-V-GS08 SL43 SI3440DV-T1-E3 CRCW0805330RJNEA ERJ-6ENF1001V CRCW0805100RFKxx ERJ-6BQFR24x PA1260 SC4812STRT
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1
8
VIN
VCC
SS/SD
GND
2
4
6
3
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D3 BY M07-200 3 R22 5.1K R17 5 6 C1 open 1 T1 CTX03-14856 9 8 C3 D2 MBRB2035CT 470uF/6.3V C6 C4 470uF/6.3V 1uF R15 0 10 R1 open Q1 FMMT618 C2 1uF 12 11 D1 1N4148WS 4 TP1 L1 4.7uH TP2
D7 MMSZ4699(12V)
5V/10
36-75V
2 TP12 R18 open TP4 R6 2.4K R8 open 1 2 C10 15nF U2 PS2521L-1 4 R10 3 100 C13 1000pF R12 0.1 C15 open R7 360 R9 1.0K
TP13
RTN
TP3
GND
C8 10uF/16V TP6 7 TP7 CS 5 1 R19 Q2 SUM27N20-78
C5 1u,100V
C7 1u,100V
C9 22uF/100V
D4 1N4148WS
U1
R11 OUT
2
POWER MANAGEMENT SC4810B Evaluation Board - Schematics( Forward )
13
D6 1N4148WS TP8 C25 2.2nF/630V TP9 TP10 TP11
10K
FB
TP5
3
COMP
C12 1nF
C14 SC4812 0.47uF
1 U3 SC431 R14 1.0K
SC4812
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SC4812
POWER MANAGEMENT SC4812 Evaluation Board - BOM( Forward )
Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 Qty. 1 2 2 2 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 Reference C9 C2, C6 C3, C4 C5, C7 C8 C10 C12 C13 C14 C25 D1, D6 D2 D3 D7 L1 Q1 Q2 R5, R15 R6 R7 R9, R14 R10 R11 R12 R17 R19 R22 T1 U1 U2 U3 Part/Value Manufacturer Manufacturer P. N. 22uf/100V Panasonic-ECG ECA2AHG220 1uf/6.3V Kemet C0805C105M9PAC3810 470uf,/6.3V Sanyo 6TPB470M 1uf/100V 10uf/16V TDK C3216X7R1C106MT 15nf Panasonic-ECG ECJ2VB1H153K 1nf Vishay VJ0805Y102KXXAT 1000pf Vishay VJ0805Y102KXXAT 0.47uf TDK C2012X7R1E474K 2.2nf/630V TDK C3216X7R2J222K 1N4148WS Vishay 1N4148WS-V-GS08 MBRB2035CT Vishay MBRB2035CT/31 BYM07-200 Vishay BYM07-200 MMSZ4699(12V) ON Semiconductor MMSZ4699T1 4.7uH Cooper Bussmann HC2LP-4R7 FMMT618 Zetex FMMT618TA SUM27N20-78 Vishay SUM27N20-78-E3 0 ohm Vishay CRCW08050000ZSTA 2.4k ohm Vishay CRCW08052K40FKEA 360 ohm Panasonic-ECG ERJ6GEYJ361V 1.0k ohm Panasonic-ECG ERJ6ENF1001V 100 ohm Panasonic-ECG ERJ6ENF1000V 10k ohm Vishay CRCW080510K0FK 0.1 ohm Panasonic-ECG ERJ1TRSFR10x 10 ohm Yageo America 9C08052A10R0FKHFT 1 ohm Panasonic-ECG ERJ6GEYJ1R0V 5.1k ohm Panasonic-ECG ERJ6GEYJ512V CTX03-14856 Cooper Bussmann CTX03-14856 SC4812 Semtech SC4812STRT PS2521L-1 NEC PS2521L-1-E3-A SC431 Semtech SC431CSK-1.TRT
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SC4812
POWER MANAGEMENT Outline Drawing - SO-8
A N 2X E/2 E1 E 1 ccc C 2X N/2 TIPS 2 e/2 B D aaa C SEATING PLANE A2 A C bxN bbb A1 C A-B D GAGE PLANE 0.25 SEE DETAIL SIDE VIEW
NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION AA.
e
D
DIM
A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.069 .053 .010 .004 .065 .049 .020 .012 .010 .007 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 8 0 .004 .010 .008 1.75 1.35 0.25 0.10 1.65 1.25 0.51 0.31 0.25 0.17 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 8 0 0.10 0.25 0.20
h h
H
c
A
L (L1) DETAIL
01
A
Land Pattern - SO-8
X
DIM
(C) G Z C G P X Y Z
DIMENSIONS INCHES MILLIMETERS
(.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40
Y P
NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET.
2. REFERENCE IPC-SM-782A, RLP NO. 300A.
Contact Information
Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804
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