L6610 ,DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLERBLOCK DIAGRAM5V/3V3 +12Vococ5V/3V3isns 12Visns50mV 120mV2.50V(B)OC+3V33V3 +/-5V UVuvBinv +3V3ov+5Vu ..
L6610D ,DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLERapplications. Thepin is used for error amplifier compensation.Input pin for 12V current sense. Toge ..
L6611 ,DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLERBLOCK DIAGRAMBinv2.50V(B)+3V33V3 +5V UV+3V3uv1.25V (B)Boutov+5V+5Vuv2.50V(A)AoutSoft Startov+12V+5V ..
L6615D ,LOAD SHARE CONTROLLERL6615HIGH/LOW SIDE LOAD SHARE CONTROLLER■ SSI SPECS COMPLIANTBCD TECHNOLOGY■ HIGH/LOW SIDE CURRENT ..
L6668 ,SMART PRIMARY CONTROLLERBlock DiagramS- S-C CO OM MP P V VHV HV CC CC15 15 1 1 5 5SL SLO OP PE ECO COMP. MP.25V 25V VR VRE ..
L6668TR ,SMART PRIMARY CONTROLLERFeaturesFigure 1. Package■ MULTIPOWER BCD TECHNOLOGY■ LOAD-DEPENDENT CURRENT-MODE CON-TROL: FIXED-F ..
LC4032ZC-75M56C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High density PDLs
LC4032ZE-5TN48I , 1.8V In-System Programmable Ultra Low Power PLDs
LC4064B-25T48C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064B-75TN48C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064V-10T100I , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
LC4064V-25T44C , 3.3V/2.5V/1.8V In-System Programmable SuperFAST High Density PLDs
L6610-L6610D
DIGITALLY PROGRAMMABLE SECONDARY HOUSEKEEPING CONTROLLER
1/29
L6610April 2002 OV/UV DETECTION FOR 3.3V, ±5V, ±12V
RAILS AND 5V (OR 3.3V) AUX. VOLTAGE OC DETECTION ON 12V AND 5V (OR 3.3V)
RAILS 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
APPLICATIONS SWITCHING POWER SUPPLIES FOR
DESKTOP PC'S, SERVERS AND WEB
SERVERS SUPERVISOR FOR DISTRIBUTED POWER
DIGITALLY PROGRAMMABLE SECONDARY
HOUSEKEEPING CONTROLLER
TYPICAL APPLICATION CIRCUIT
L6610 2/29
BLOCK DIAGRAM
3/29
L6610
DESCRIPTIONThe L6610 is a control and housekeeping IC developed in BCD technology; it is 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.
The Housekeeping's main function is to control and monitor the voltages generated by both the main and the
auxiliary converter: it senses those voltages, sends feedback signals to the primary controllers for regulation
and, upon detection of an undervoltage (UV), overvoltage (OV) or overcurrent (OC) condition, reports such fault
and takes proper action to protect the system.
However, the peculiar feature of this IC is its digital programming capability that enables an accurate trimming
of the output voltage rails during production test via software, without any use of external discrete trimming com-
ponents or need for manual intervention on the PSU. It is also possible to program some of the monitoring func-
tions and select how UV and OC conditions are handled in the main converter: whether latched-mode (the
information is latched and released only by forcing the restart of the IC) or bouncing-mode (an attempt is made
to automatically restart the converter after 1 second wait).
A key feature of this IC is its contribution to a very low external component count. Besides the extensive use of
onboard programmable switches, which prevents the need for external trimming components, the IC embeds
reference voltages, error amplifiers and most of the housekeeping circuitry normally required.
PIN CONNECTION (top view)
PIN DESCRIPTION
L6610 4/29
PIN DESCRIPTION (continued)
5/29
L6610
FUNCTION DESCRIPTION
PIN DESCRIPTION (continued)
L6610 6/29
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA(*) mounted on board
FUNCTION DESCRIPTION (continued)
7/29
L6610
ELECTRICAL CHARACTERISTCS (unless otherwise specified: TJ = 0 to 105°C; VDD = 5V, V3V3 = 3.3V, V5V = 5V, V-12V = -12V, V-5V = -5V,
VDmon = VDD, PS-ON = low)
SUPPLY SECTION
FAULT THRESHOLDS
L6610 8/29
ACsense / Hysteresis
FAULT OUTPUTS
ELECTRICAL CHARACTERISTCS (continued)(unless otherwise specified: TJ = 0 to 105°C; VDD = 5V, V3V3 = 3.3V, V5V = 5V, V-12V = -12V, V-5V = -5V,
VDmon = VDD, PS-ON = low)
9/29
L6610
START-UP / SHUTDOWN FUNCTIONS
VOLTAGE REFERENCE (BUFFERED EXTERNAL PIN)
MAIN CONVERTER FEEDBACK (ERROR AMPLIFIER A)
ELECTRICAL CHARACTERISTCS (continued)(unless otherwise specified: TJ = 0 to 105°C; VDD = 5V, V3V3 = 3.3V, V5V = 5V, V-12V = -12V, V-5V = -5V,
VDmon = VDD, PS-ON = low)
L6610 10/29
MAGAMP OR LINEAR POST-REGULATOR FEEDBACK (ERROR AMPLIFIER B)
AUXILIARY CONVERTER FEEDBACK (ERROR AMPLIFIER C)
ELECTRICAL CHARACTERISTCS (continued)(unless otherwise specified: TJ = 0 to 105°C; VDD = 5V, V3V3 = 3.3V, V5V = 5V, V-12V = -12V, V-5V = -5V,
VDmon = VDD, PS-ON = low)
11/29
L6610
PROGRAMMING FUNCTIONS
ELECTRICAL CHARACTERISTCS (continued)(unless otherwise specified: TJ = 0 to 105°C; VDD = 5V, V3V3 = 3.3V, V5V = 5V, V-12V = -12V, V-5V = -5V,
VDmon = VDD, PS-ON = low)
L6610 12/29
Figure 2. IC Supply current vs. supply voltage
Figure 3. IC Supply current
Figure 4. Monitored inputs bias current
Figure 5. Output's current sense thresholds
Figure 6. 3.3V fault thresholds
TYPICAL ELECTRICAL CHARACTERISTICS
13/29
L6610
Figure 7. 5V fault thresholds
Figure 9. 3.3V/5V Dmon fault thresholds
Figure 10. -5V and -12V bias current
Figure 12. ACsense reference
TYPICAL ELECTRICAL CHARACTERISTICS (continued)
L6610 14/29
Figure 13. External voltage reference. Figure 14. Error amplifier A, B and C reference
voltage
Figure 15. Error amplifiers (A, B, C) Gain and Phase
TYPICAL ELECTRICAL CHARACTERISTICS (continued)
15/29
L6610
APPLICATION INFORMATION INDEX On board digital trimming and mode selection..................................................................................Page 16
Error amplifiers and reference voltages .....................................................................................................18
Main section: error amplifier A and Soft -Start
E/A and reference voltage
3.3V section: error amplifier B
Auxiliary section: error amplifier C
Normal operation timing diagram ...............................................................................................................20
Undervoltage, overvoltage, overcurrent and relevant timings....................................................................21
AC sense (mains undervoltage warning) ...................................................................................................21
Application example...................................................................................................................................23
Application ideas........................................................................................................................................25
