l6611 STMicroelectronics, l6611 Datasheet

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l6611

Manufacturer Part Number
l6611
Description
Digitally Programmable Secondary Housekeeping Controller
Manufacturer
STMicroelectronics
Datasheet
TYPICAL APPLICATION CIRCUIT
April 2002
OV/UV DETECTION FOR 3.3V, +5V, ±12V
RAILS AND 5V (OR 3.3V) AUX. VOLTAGE
AC MAINS UV (BROWNOUT) DETECTION
WITH HYSTERESIS
ON-LINE DIGITAL TRIMMING FOR 5V/12V,
3.3V, 5V (OR 3.3V) AUX. FEEDBACK
REFERENCES AND AC MAINS UV.
DIGITALLY SELECTABLE OPTIONS
ERROR AMPLIFIERS FOR 5V/12V RAILS
(MAIN SUPPLY), 3V3 POST-REGULATOR
(MAG_AMP OR LINEAR) AND AUXILIARY
SUPPLY.
MAIN SUPPLY ON/OFF CONTROL AND
POWER GOOD SIGNAL
50mA CROWBAR DRIVE FOR AUXILIARY
OUTPUT OVP.
OPEN GROUND PROTECTION
8ms DIGITAL SOFT START
64 ms UV/OC BLANKING AT START-UP
WIDE RANGE
MAINS
+
-
DIGITALLY PROGRAMMABLE SECONDARY
CONTROL
AUXILIARY
MAIN
CONTROL
HOUSEKEEPING CONTROLLER
APPLICATIONS
SWITCHING POWER SUPPLIES FOR
DESKTOP PC'S, SERVERS AND WEB
SERVERS
SUPERVISOR FOR DISTRIBUTED POWER
L6611N
DIP20
VDD
Cout
MFault
Aout
Bout
ORDERING NUMBERS:
L6611
BCD TECHNOLOGY
Dmon
-12V
Gnd
3V3
12V
5V
L6611D
L6611DTR(T & Reel)
+12V
+5V
-12V
+3.3V
COM
SO20
+5Vaux
L6611
1/28

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l6611 Summary of contents

Page 1

... APPLICATIONS SWITCHING POWER SUPPLIES FOR DESKTOP PC'S, SERVERS AND WEB SERVERS SUPERVISOR FOR DISTRIBUTED POWER MAIN CONTROL AUXILIARY CONTROL L6611 BCD TECHNOLOGY DIP20 SO20 ORDERING NUMBERS: L6611D L6611DTR(T & Reel) +12V +5V COM -12V +3.3V +5Vaux Bout Dmon VDD 12V Cout 5V MFault -12V 3V3 ...

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Logic and Programmable Trimming ...

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... DESCRIPTION The L6611 is a control and housekeeping IC developed in BCD technology intended for acting at the sec- ondary side of desktop PC's or server's switching power supplies, in presence of standard voltage rails (+3.3V, +5V, ±12V) generated by a main converter and of a supply line generated by an auxiliary converter. The typical application circuit is showed on the front page ...

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... L6611 PIN DESCRIPTION (continued) Pin # Name Output of the error amplifier for the main converter. This pin typically drives an optocoupler and is 4 Aout also used for compensation along with Ainv (pin #5). Main loop error amplifier inverting input. The non-inverting input is connected to an internal 2.5V reference that can be digitally trimmed ...

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... When Vdd goes below the UV threshold, all latches are reset and volatile programming memory cleared. Dmon (#8) is monitored to detect an overvoltage condition; in this case MFAULT (#1) and Dual-OVP DFAULT (#9) are latched high. Dmon (#8) is monitored to detect an undervoltage condition; in this case MFAULT (#1) is latched Dual-UVP high and Cout (#6) is pulled low. Description Description L6611 5/28 ...

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... L6611 FUNCTION DESCRIPTION (continued) Name The IC provides an on-board 8ms soft-start, a quasi-monotonic ramp from 0V to 2.5V for the A error amplifier reference voltage, in order to avoid high current peaks in the primary circuit and Soft-start output voltage overshoots at start-up. In fact, if this reference gets the nominal value as soon as the power-up occurs, the A E/A will go out of regulation and tend to sink much more current, thus forcing PWM to work with the maximum duty-cycle ...

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... Vout = 3.3V Aux/Dual (Dmon option) UV 3V3 undervoltage OV 3V3 overvoltage Vout = 5V Aux/Dual (Dmon option undervoltage OV 5V overvoltage Bias current ACsense / Hysteresis Bias current = 5V 3.3V 5V 3V3 5V Test Condition No Fault Voltage to disable comparator V = 2.7V ACsns L6611 = -12V, , -12V Min. Typ. Max. Unit 4.2 4.3 4.6 V 3.7 3.8 4.1 V 0.25 0.5 0.75 V 6.1 6.3 6 ...

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... L6611 ELECTRICAL CHARACTERISTCS (continued) (unless otherwise specified 105° PS-ON = low) Dmon DD Symbol Parameter UV AC undervoltage Trim range Trim resolution I Hysteresis current ACH Hysteresis trim range H Hysteresis adjust step S FAULT OUTPUTS V PW-OK high state POKH V PW-OK low state POKL I MFAULT high state leakage ...

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... GND. 5V contribution to 5/12 feedback 2V<V <4V OUT 4.5V<V < 2.7V 1.1V FB OUT V = 2.3V OUT V = 2.3V SOURCE V = 2.7V SINK T = 25° About nominal L6611 = -12V, , -12V Min. Typ. Max. Unit 2.0 V 0.8 V Vdd V +0 100 100 2.375 2.50 2.625 ...

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... L6611 ELECTRICAL CHARACTERISTCS (continued) (unless otherwise specified 105° PS-ON = low) Dmon DD Symbol Parameter Trim resolution I Input bias current BIAS A Voltage gain VOL GBW Unity gain bandwidth PSRR Power supply rejection ratio I Output sink current OUTL I Output source current ...

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... V , PS-ON = low) Dmon DD Symbol Parameter F Clock Frequency CLOCK V Data Input Low DATALO V Data Input High DATAHI I PROM Fuse Current FUSE t PROM Fusing Time FUSE = 5V 3.3V 5V 3V3 5V Test Condition L6611 = -12V, , -12V Min. Typ. Max. Unit 0.8 MHz 1 400 11/28 ...

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... L6611 TYPICAL ELECTRICAL CHARACTERISTICS Figure 1. Supply start-up, UV and OV V [V] DD 6.5 over voltage 5.5 start-up 4.5 UV 3.5 -50 - Figure 2. IC Supply current vs. supply voltage I [mA Dmon = ° [V] DD Figure 3. IC Supply current I [mA ...

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... Figure 11. ACsense and external voltage references 2.7 2.6 2.5 2.4 2.3 100 125 150 Figure 12. Error amplifier A, B and C reference [V] 3 2.5 2 1.5 1 100 125 150 0.5 overvoltage undervoltage -50 - 100 125 150 [V] -50 - 100 125 150 voltage -50 - 100 125 150 L6611 13/28 ...

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... L6611 TYPICAL ELECTRICAL CHARACTERISTICS (continued) Figure 13. Error amplifiers ( Gain and Phase 200 200 150 150 100 100 -50 -50 -100 -100 -150 -150 -200 -200 1e+00 1e+00 1e+01 1e+01 14/28 phase phase gain gain 1e+02 1e+02 1e+03 1e+03 1e+04 1e+ 1e+05 1e+05 1e+06 1e+06 1e+07 7e+07 1e+07 7e+ 180 ...

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... Main section: error amplifier A and Soft -Start E/A and reference voltage 3.3V section: error amplifier B Auxiliary section: error amplifier C 3 Normal operation timing diagram ............................................................................................................... 20 4 Undervoltage, overvoltage and relevant timings ........................................................................................ sense (mains undervoltage warning) ................................................................................................... 22 6 Application example ................................................................................................................................... 23 7 Application ideas ........................................................................................................................................ 25 APPLICATION INFORMATION INDEX L6611 15/28 ...

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... L6611 APPLICATION INFORMATION 1 ONBOARD DIGITAL TRIMMING AND MODE SELECTION By forcing the PROG input pin high, the chip enters programming mode: the multifunction pins PW_OK and PS_ON are then disconnected from their normal functions (output pins) and are connected to internal logic as DATA and CLOCK inputs respectively, allowing chip programming even when the device is assembled on the application board. Onboard chip programming allows: – ...

Page 17

... Enabled Disabled MSB ACsns ACsns threshold Hysteresys 2.5V typ typ. 0010 0101 [mV +112 +96 +80 +64 +48 +7.5 +32 +5.0 +16 +2 -16 -2.5 -32 -5.0 -48 -7.5 -64 -10 -80 -96 -112 -128 5V/ 3.3V Dmon 5V UV/OV Selection 0110 D2 D1 Enabled 5V Disabled 3.3V LSB 0 1 L6611 17/28 ...

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... 12V 12V 168K 168K 600K 600K _ _ Aout Aout + + 80.6K 80.6K 8ms SS 8ms SS L6611 L6611 GND GND +2.5V +2. only the +5V output is kept under feed- H2 optional, to change optional, to change feedback weight feedback weight Ainv Ainv R ...

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... DMON Cout Cout OCP bounce OCP bounce GND GND which, in turn, implies a larger volt- C +3.3V +3. Binv Binv +1.25V +1.25V V V AUX AUX Cinv Cinv +1.25V +1.25V L6611 L6611 L6611 causes the R 19/28 ...

Page 20

... L6611 3 NORMAL OPERATION TIMING DIAGRAM (FIG. 18) The time intervals t1-t5 are listed below – t1: UV/OC blanking of MFAULT. While Main outputs are ramping up, the UV comparators are blanked for this interval to prevent a false turn-off. No such blanking is applied to OV faults. – t2: PW-OK delay. This period starts when all monitored outputs and AC sense are above their respec- tive UV levels and finishes at PW-OK going high. – ...

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... Q Q Latch Latch Reset Reset Latch Latch Reset Reset R R Out Out Vdd Vdd Reset Reset Vdd Vdd Delay 250ms Delay 250ms In In Out Out Clock Clock Reset Reset L6611 Mfault Mfault Vdd Vdd Dfault Dfault Cout Cout PW-OK PW-OK 21/28 ...

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... L6611 DFAULT; in the "Application ideas" section, another simple circuit is showed to guarantee the same pro- tection without the SCR. – Dmon input undervoltage: when an undervoltage on Dmon is detected, MFAULT is put high, Cout is pulled low (an internal OCP_BOUNCE signal is generated, see fig. 19) and PW_OK falls down. This function is enabled 64ms after the UVLO signal falls down ...

Page 23

... The Auxiliary section supplies a stand-by voltage (5V typ.) through a flyback converter. The Main section, in forward configuration, presents 4 standard outputs (3.3V, +5V, ±12V). At the secondary side, the housekeeping circuitry governed by the L6611 checks the outputs and sends control signals to the primary side through three optocouplers. It also generates power good information to the system while managing all timings during power-up and power-down sequences. In fig detailed circuit for the sec- ondary side is presented ...

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... L6611 Figure 22. Detailed Secondary Side 24/28 +12V +5V COM -12V +3.3V L6611 M-FAULT 12V Binv 5V Bout 3V3 Aout PROG Ainv GND Cout -12 Cinv VREF DMON PS-ON DFAULT PW-OK Vdd ACsns +5Vaux ...

Page 25

... L6611 L6611 BC558 BC558 Q1 Q1 BC548 BC548 C C DEL DEL defines the turn-on delay. A diode con- DEL +3.3V +3. Binv Binv + + +1.25V +1.25V V V AUX AUX R R SET SET Q2 Q2 5K6 5K6 L6611 SET 25/28 ...

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... L6611 mm DIM. MIN. TYP. MAX. a1 0.254 B 1.39 1.65 b 0.45 b1 0.25 D 25.4 E 8.5 e 2.54 e3 22.86 F 7.1 I 3.93 L 3.3 Z 1.34 26/28 inch MIN. TYP. MAX. 0.010 0.055 0.065 0.018 0.010 1.000 0.335 0.100 0.900 0.280 0.155 0.130 0.053 OUTLINE AND MECHANICAL DATA DIP20 ...

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... D 12.6 13 0.496 E 7.4 7.6 0.291 e 1. 10.65 0.394 h 0.25 0.75 0.010 L 0.4 1.27 0.016 K 0˚ (min.)8˚ (max inch MECHANICAL DATA TYP. MAX. 0.104 0.012 0.020 0.013 0.512 0.299 0.050 0.419 0.030 0.050 L6611 OUTLINE AND SO20 h x 45˚ SO20MEC 27/28 ...

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... L6611 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice ...

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