Si9108
Vishay Siliconix
1-W High-Voltage Switchmode Regulator
FEATURES
D CCITT Compatible D Current-Mode Control D Low Power Consumption (less than 5 mW) D 10- to 120-V Input Range D 200-V, 250-mA MOSFET D Internal Start-Up Circuit D SHUTDOWN and RESET D Maximum Duty Cycle of 99.9%
DESCRIPTION
The Si9108 high-voltage switchmode regulator is a monolithic BiC/DMOS integrated circuit which contains most of the components necessary to implement a high-efficiency dc/dc converter in ISDN terminals up to 3 watts. A 0.5-mA max supply current makes possible the design of a dc/dc converter with 60% efficiency at 25 mW, therefore meeting the recommended performance under the CCITT I.430 specifications. This device may be used with an appropriate transformer to implement isolated flyback power converter topologies to provide single or multiple regulated dc outputs (i.e., "5 V). The Si9108 is available in both standard and lead (Pb)-free 16-pin wide-body SOIC, 14-pin plastic DIP and 20-pin PLCC packages which are specified to operate over the industrial temperature range of −40 _C to 85 _C.
FUNCTIONAL BLOCK DIAGRAM
OSC IN OSC OUT
FB
COMP
DISCHARGE
Error Amplifier − VREF + 4 V (1%) Ref Gen 2V − + + − 1.2 V BIAS VCC +VIN 8.7 V − + 9.3 V − + Undervoltage Comparator Current Sources To Internal Circuits C/L Comparator
OSC Clock Current-Mode Comparator R Q S DRAIN −VIN (BODY)
VCC
SOURCE
S Q R
SHUTDOWN RESET
Document Number: 70883 S-42038—Rev. B,15-Nov-04
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Si9108
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to −VIN (VCC < +VIN + 0.3 V) VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 V VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200 V ID (Peak) (300 ms pulse, 2% duty cycle) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 A ID (rms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 mA Logic Inputs (RESET, SHUTDOWN, OSC IN) . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VCC + 0.3 V Linear Inputs (FEEDBACK, SOURCE) . . . . . . . . . . . . . . . . . . . −0.3 V to 7 V HV Pre-Regulator Input Current (continuous) . . . . . . . . . . . . . . . . . . . . . 5 mA Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65 to 125_C Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −40 to 85_C Junction Temperature (TJ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 6 mW/_C above 25_C c. Derate 7.2 mW/_C above 25_C d. Derate 11.2 mW/_C above 25_C Power Dissipation (Package)a 14-Pin Plastic DIP (J Suffix)b . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 750 mW 16-Pin Plastic Wide-Body SOIC (W Suffix)c . . . . . . . . . . . . . . . . . . . 900 mW 20-Pin PLCC (N Suffix)d . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1400 mW Thermal Impedance (QJA) 14-Pin Plastic DIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167_C/W 16-Pin Plastic Wide-Body SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140_C/W 20-Pin PLCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90_C/W
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Voltages Referenced to −VIN VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 13.5 V +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 120 V fOSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 kHz to 1 MHz ROSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 kW to 1 MW Linear Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC − 3 V Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to VCC
SPECIFICATIONSa
Test Conditions Unless Otherwise Specified Parameter Reference
Output Voltage Output Impedancee Short Circuit Current Temperature Stabilitye Long Term Stabilitye VR ZOUT ISREF TREF OSC IN = VIN (OSC Disabled) RL = 10 MW OSC IN = −VIN OSC IN = − VIN, VREF = −VIN OSC IN = −VIN t = 1000 hrs, TA = 125_C Room Room Room Full Room 3.92 15 70 4.00 300 100 0.25 5.00 4.08 45 130 1.0 25.00 V kW mA mV/_C mV
Limits Tempb Minc Typd Maxc Unit
Symbol
DISCHARGE = −VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 820 kW , ROSC = 910 kW
Oscillator
Maximum Frequencye Initial Accuracy Voltage Stability Temperature Coefficiente fMAX fOSC Df/f TOSC ROSC = 0 See Note e Df/f = f (13.5 V) − f (9.5 V)/f (9.5 V) Room Room Room Full 1 32 3 40 10 200 48 15 500 MHz kHz % ppm/_C
Error Amplifier
Feedback Input Voltage Input BIAS Current Open Loop Voltage Gaine Input Offset Voltage Unity Gain Bandwidthe Dynamic Output Impedance Output Current Power Supply Rejection www.vishay.com VFB IFB AVOL VOS BW ZOUT IOUT PSRR Source (VFB = 3.4 V) Sink (VFB = 4.5 V) 10 V v VCC v 13.5 V OSC IN = −VIN FB Tied to COMP OSC IN = −VIN (OSC Disabled) OSC IN = −VIN, VFB = 4 V OSC IN = −VIN (OSC Disabled) Room Room Room Room Room Room Room Room Room 0.05 0.5 60 3.96 4 25 80 "15 0.8 1 −1.2 0.08 70 −0.32 "40 4.04 500 V nA dB mV MHz kW mA dB
2
Document Number: 70883 S-42038—Rev. B,15-Nov-04
Si9108
Vishay Siliconix
SPECIFICATIONSa
Test Conditions Unless Otherwise Specified Parameter PWM
Maximum Duty Cycle Dead Time Minimum Duty Cycle Minimum Pulse Width Before Pulse Drops Out DMIN DMAX Room Room Room Room 110 99.0 99.6 100 0 175 99.9 % ns % ns
Limits Tempb Minc Typd Maxc Unit
Symbol
DISCHARGE = −VIN = 0 V VCC = 10 V, +VIN = 48 V RBIAS = 820 kW , ROSC = 910 kW
Current Limit
Threshold Voltage Delay to Outpute Input Voltage Input Leakage Current Pre-Regulator Start-Up Current VCC Pre-Regulator Turn-Off Threshold Voltage Undervoltage Lockout VREG − VUVLO VSOURCE td +VIN +IIN ISTART VREG VUVLO VDELTA RL = 100 W from DRAIN to VCC VFB = 0 V RL = 100 W from DRAIN to VCC VSOURCE = 1.5 V, See Figure 1 IIN = 10 mA VCC w 10 V Pulse Width v 300 ms, VCC = 7 V IPRE-REGULATOR = 10 mA RL = 100 W from DRAIN to VCC See Detailed Description Room Room Room Room Room Room Room Room 8 7.5 7.0 0.25 15 9.3 8.7 0.5 9.7 9.2 V 120 10 0.8 1.0 200 1.2 300 V ns V mA mA
Supply
Supply Current Bias Current SHUTDOWN Delay SHUTDOWN Pulse Width RESET Pulse Width Latching Pulse Width SHUTDOWN and RESET Low Input Low Voltage Input High Voltage Input Current, Input Voltage High Input Current, Input Voltage Low ICC IBIAS tSD tSW tRW tLW VIL VIH IIH IIL VIN = 10 V VIN = 0 V See Figure 3 Figure VSOURCE = −VIN, See Figure 2 Room Room Room Room Room Room Room Room Room Room −35 8.0 1 −25 5 50 50 25 2.0 V mA ns 0.35 7.5 50 100 0.5 mA mA
MOSFET Switch
Breakdown Voltage Drain-Source On Resistanceg Drain Off Leakage Current Drain Capacitance V(BR)DSS rDS(on) IDSS CDS IDRAIN = 100 mA IDRAIN = 100 mA VDRAIN = 100 V Full Room Room Room 35 200 220 5 7 10 V W mA pF
Notes a. Refer to PROCESS OPTION FLOWCHART for additional information. b. Room = 25_C, Cold and Hot = as determined by the operating temperature suffix. c. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum, is used in this data sheet. d. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. e. Guaranteed by design, not subject to production test. f. CSTRAY Pin 8 = v 5 pF g. Temperature coefficient of rDS(on) is 0.75% per _C, typical.
Document Number: 70883 S-42038—Rev. B,15-Nov-04
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Si9108
Vishay Siliconix
TIMING WAVEFORMS
1.5 V − SOURCE 0 VCC − DRAIN 0
50% td
tr v 10 ns
VCC SHUTDOWN 0 VCC DRAIN 0
50% − − tSD
tf v 10 ns
10%
10%
FIGURE 1.
FIGURE 2.
VCC SHUTDOWN 0 VCC RESET 0 50% − 50% −
tSW 50% tLW 50% tRW 50% tf, tf v 10 ns
FIGURE 3.
TYPICAL CHARACTERISTICS
Output Switching Frequency vs. Oscillator Resistance
2M
f OUT (Hz)
200 k
20 k 10 k 100 k rOSC − Oscillator Resistance (W) 1M
FIGURE 4.
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Document Number: 70883 S-42038—Rev. B,15-Nov-04
Si9108
Vishay Siliconix
PIN CONFIGURATIONS
SO-16 (Wide-Body)
3 1 2 3 4 5 6 7 14 13 12 11 10 9 8 1 2 3 4 5 6 7 8 Top View Top View 16 15 14 13 12 11 10 9 9 10 11 12 13 Top View 4 5 6 7 8 18 17 16 15 14
PLCC-20
2 1 20 19
PDIP-14
PIN DESCRIPTION
Pin Number Function
SOURCE −VIN VCC OSCOUT OSCIN DISCHARGE VREF SHUTDOWN RESET COMP FB BIAS +VIN DRAIN NC
14-Pin Plastic DIP
4 5 6 7 8 9 10 11 12 13 14 1 2 3
16-Pin SOIC
1 2 4 5 6 7 8 9 10 11 12 13 14 16 3, 15
20-Pin PLCC
7 8 9 10 11 12 14 16 17 18 20 2 3 5 1, 4, 6, 13, 15, 19
ORDERING INFORMATION
Standard Part Number
Si9108DJ02 Si9108DW Si9108DW-T1 (With Tape and Reel) Si9108DN02 Si9108DN02-T1 (With Tape and Reel) Si9108DN02-T1—E3 (With Tape and Reel) PLCC-20 Si9108DW-T1—E3 (With Tape and Reel) SOIC-16 (WB) −40 to 85 _C
Lead (Pb)-Free Part Number
Si9108DJ02—E3
Package
PDIP-14
Temperature Range
Document Number: 70883 S-42038—Rev. B,15-Nov-04
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Si9108
Vishay Siliconix
DETAILED DESCRIPTION
Pre-Regulator/Start-Up Section Due to the low quiescent current requirement of the Si9108 control circuitry, bias power can be supplied from the unregulated input power source, from an external regulated low-voltage supply, or from an auxiliary “bootstrap” winding on the output inductor or transformer. When power is first applied during start-up, +VIN will draw a constant current. The magnitude of this current is determined by a high-voltage depletion MOSFET device which is connected between +VIN and VCC. This start-up circuitry provides initial power to the IC by charging an external bypass capacitance connected to the VCC pin. The constant current is disabled when VCC exceeds 9.3 V. If VCC is not forced to exceed the 9.3-V threshold, then VCC will be regulated to a nominal value of 9.3 V by the pre-regulator circuit. As the supply voltage rises toward the normal operating conditions, an internal undervoltage (UV) lockout circuit keeps the output MOSFET disabled until VCC exceeds the undervoltage lockout threshold (typically 8.7 V). This guarantees that the control logic will be functioning properly and that sufficient gate drive voltage is available before the MOSFET turns on. The design of the IC is such that the undervoltage lockout threshold will not exceed the pre-regulator turn-off voltage. Power dissipation can be minimized by providing an external power source to VCC such that the constant current source is always disabled. BIAS To properly set the bias for the Si9108, a 820-kW resistor should be tied from BIAS to −VIN. This determines the magnitude of bias current in all of the analog sections and the pull-up current for the SHUTDOWN and RESET pins. The current flowing in the bias resistor is nominally 7.5 mA. Reference Section The reference section of the Si9108 consists of a temperature compensated buried zener and trimmable divider network. The output of the reference section is connected internally to the non-inverting input of the error amplifier. Nominal reference output voltage is 4 V. The trimming procedure that is used on the Si9108 brings the output of the error amplifier (which is configured for unity gain during trimming) to within "1% of 4 V. This automatically compensates for the input offset voltage in the error amplifier. The output impedance of the reference section has been purposely made high so that a low impedance external voltage source can be used to override the internal voltage source, if desired, without otherwise altering the performance of the device.
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Error Amplifier Closed-loop regulation is provided by the error amplifier, whose 1-kW dynamic output impedance enables it to be used with feedback compensation (unlike transconductance amplifiers). A MOS differential input stage provides for low input current. The noninverting input to the error amplifier (VREF) is internally connected to the output of the reference supply and should be bypassed with a small capacitor to ground. Oscillator Section The oscillator consists of a ring of CMOS inverters, capacitors, and a capacitor discharge switch. Frequency is set by an external resistor between the OSC IN and OSC OUT pins. (See Typical Characteristics graph of resistor value vs. frequency.) The DISCHARGE pin should be tied to −VIN for normal internal oscillator operation. For 98% duty cycle, the discharge pin must be connected to −VIN or can be connected to −VIN through a resistor to set the dead time. Remote synchronization can be accomplished by capacitive coupling of a synchronization pulse into the OSC IN terminal. For a 5-V pulse amplitude and 0.5-ms pulse width, typical values would be 100 pF in series with 3 kW to OSC IN. SHUTDOWN and RESET SHUTDOWN and RESET are intended for overriding the output MOSFET switch via external control logic. The two inputs are fed through a latch preceding the output switch. Depending on the logic state of RESET, SHUTDOWN can be either a latched or unlatched input. The output is off whenever SHUTDOWN is low. By simultaneously having SHUTDOWN and RESET low, the latch is set and SHUTDOWN has no effect until RESET goes high. (See the table below.) Table 1: Truth Table for the SHUTDOWN and RESET Pins SHUTDOWN
H H L L H L L
RESET
H
Output
Normal Operation Normal Operation (No Change) Off (Not Latched) Off (Latched) Off (Latched, No Change)
When power is first applied during start-up, +VIN will draw a constant current. The magnitude of this current is determined by a high-voltage depletion MOSFET device which is connected between +VIN and VCC. This start-up circuitry provides initial power to the IC by charging an external bypass capacitance connected to the VCC pin. The constant current is disabled when VCC exceeds 9.3 V. If VCC is not forced to exceed the 9.3-V threshold, then VCC will be regulated to a nominal value of 9.3 V by the pre-regulator circuit.
Document Number: 70883 S-42038—Rev. B,15-Nov-04
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Si9108
Vishay Siliconix
DETAILED DESCRIPTION (CONT’D)
Both pins have internal current source pull-ups and can be left disconnected when not in use. An added feature of the current sources is the ability to connect a capacitor and an open-collector driver to the SHUTDOWN pin to provide variable shutdown time. Output Switch The output switch is a 7-W , 200-V lateral DMOS transistor. Like discrete MOSFETs, the switch contains an intrinsic body-drain diode. However, the body contact in the Si9108 is connected internally to −VIN and is independent of the SOURCE.
APPLICATIONS
+VIN 7 NC 2 +VIN 8 910 k 20 mF + − 12 0.1 mF NC 10 1 0.1 mF 0.1 mF 7 OSCIN OSCOUT RESET VREF BIAS 11 SD DRAIN VCC FB COMP SOURCE 3 6 14 13 15 k 4 0.22 mF 12 V 1 mF 8 BYS10-45 10
BYS10-25 2
+5 V
0.1 mF 5.6 V 3
220 mF
OUTPUT
Si9108DJ
0.1 mF 71.5 k 1% 9 4 BYS10-25 150 k
47 mF
−5 V
−VIN DISCHGR 820 k 5 9 3.9 W 47.5 k 1%
INPUT GND (GND Plane)
FIGURE 5. CCITT Compatible ISDN Terminal Power Supply
Vishay Siliconix maintains worldwide manufacturing capability. Products may be manufactured at one of several qualified locations. Reliability data for Silicon Technology and Package Reliability represent a composite of all qualified locations. For related documents such as package/tape drawings, part marking, and reliability data, see http://www.vishay.com/ppg?70883. Document Number: 70883 S-42038—Rev. B,15-Nov-04 www.vishay.com
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Vishay
Notice
Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale.
Document Number: 91000 Revision: 08-Apr-05
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Package Information
Vishay Siliconix
SOIC (WIDE-BODY): 16-LEAD (POWER IC ONLY)
0.2025$0.001
0.06$0.002D CAVITY NO.
ECN: S-40079—Rev. A, 02-Feb-04 DWG: 5910 0.334$0.005 R0.004
16 15 14 13 12 0.1475$0.001 0.070$0.005
11
10
9
0.010
R0.008 R0.009
0.295$0.001 R0.004 1 23 4 5 6 7 8 0.032$0.005 DETAIL A
4°$2°
0.055$0.005 PIN 1 INDICATOR 0.0470.007$0.001 dp SURFACE POLISHED 0.334$0.005 0.291$0.001 0.02045° 0.405$0.001 0.091$0.001 0.098$0.002
7°(4)
R0.004 0.041$0.001 0.050 TYP. 0.006$0.002 0.017$0.0003
0.295$0.001 0.406$0.004 DETAIL A
All Dimensions In Inches
Document Number: 72805 28-Jan-04
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Package Information
Vishay Siliconix
PLCC: 2O-LEAD (POWER IC ONLY)
D−SQUARE D1−SQUARE B1
A2
MILLIMETERS Dim A A1 A2 B B1 D D1 D2 e1 Min
4.20 2.29 0.51 0.331 0.661 9.78 8.890 7.37
INCHES Min
0.165 0.090 0.020 0.013 0.026 0.385 0.350 0.290
Max
4.57 3.04 − 0.553 0.812 10.03 9.042 8.38
Max
0.180 0.120 − 0.021 0.032 0.395 0.356 0.330
B e1 D2
1.27 BSC
0.050 BSC
A1 A
ECN: S-40081—Rev. A, 02-Feb-04 DWG: 5917
0.101 mm 0.004″
Document Number: 72812 28-Jan-04
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Package Information
Vishay Siliconix
PDIP: 14-LEAD (POWER IC ONLY)
14
13
12
11
10
9
8 E1 E
1
2
3
4
5
6
7
D S Q1
A
A1
L 15° MAX eA
B1
e1
B
C
Dim A A1 B B1 C D E E1 e1 eA L Q1 S
MILLIMETERS Min Max
3.81 0.38 0.38 0.89 0.20 17.27 7.62 5.59 2.29 7.37 2.79 1.27 1.02 5.08 1.27 0.51 1.65 0.30 19.30 8.26 7.11 2.79 7.87 3.81 2.03 2.03
INCHES Min Max
0.150 0.015 0.015 0.035 0.008 0.680 0.300 0.220 0.090 0.290 0.110 0.050 0.040 0.200 0.050 0.020 0.065 0.012 0.760 0.325 0.280 0.110 0.310 0.150 0.080 0.080
ECN: S-40081—Rev. A, 02-Feb-04 DWG: 5919
Document Number: 72814 28-Jan-04
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Legal Disclaimer Notice
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE. Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively, “Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other disclosure relating to any product. Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special, consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular purpose, non-infringement and merchantability. Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a particular product with the properties described in the product specification is suitable for use in a particular application. Parameters provided in datasheets and/or specifications may vary in different applications and performance may vary over time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed therein. Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining applications or for any other application in which the failure of the Vishay product could result in personal injury or death. Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk and agree to fully indemnify and hold Vishay and its distributors harmless from and against any and all claims, liabilities, expenses and damages arising or resulting in connection with such use or sale, including attorneys fees, even if such claim alleges that Vishay or its distributor was negligent regarding the design or manufacture of the part. Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for such applications. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000 Revision: 11-Mar-11
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