Secondary Side Post Regulator for AC/DC and DC/DC Multiple Output Converters

CS5101
Secondary Side Post
Regulator for AC/DC and
DC/DC Multiple Output
Converters
The CS5101 is a bipolar monolithic secondary side post regulator
(SSPR) which provides tight regulation of multiple output voltages in
AC/DC or DC/DC converters. Leading edge pulse width modulation
is used with the CS5101.
The CS5101 is designed to operate over an 8.0 V to 45 V supply
voltage (VCC) range and up to a 75 V drive voltage (VC).
The CS5101 features include a totem pole output with 1.5 A peak
output current capability, externally programmable overcurrent
protection, an on chip 2.0% precision 5.0 V reference, internally
compensated error amplifier, externally synchronized switching
frequency, and a power switch drain voltage monitor. It is available in
a 14 lead plastic DIP or a 16 lead wide body SOIC package.
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PDIP−14
N SUFFIX
CASE 646
14
1
SO−16WB
DW SUFFIX
CASE 751G
16
1
Features
MARKING DIAGRAMS AND
PIN ASSIGNMENTS
1.5 A Peak Output (Grounded Totem Pole)
8.0 V to 75 V Gate Drive Voltage
8.0 V to 45 V Supply Voltage
300 ns Propagation Delay
1.0% Error Amplifier Reference Voltage
Lossless Turn On and Turn Off
Sleep Mode: < 100 mA
Overcurrent Protection with Dedicated Differential Amp
Synchronization to External Clock
External Power Switch Drain Voltage Monitor
Pb−Free Packages are Available*
1
SYNC
VCC
VREF
CS5101EN14
AWLYYWWG
•
•
•
•
•
•
•
•
•
•
•
LGND
VFB
COMP
14
VD
VC
VG
PGND
IS COMP
IS−
IS+
RAMP
PDIP−14
1
CS5101
AWLYYWWG
SYNC
VCC
VREF
DGND
AGND
VFB
COMP
RAMP
16
VD
VC
VG
PGND
PGND
IS COMP
IS−
IS+
SO−16WB
A
WL
YY
WW
G
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
October, 2006 − Rev. 6
1
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Publication Order Number:
CS5101/D
CS5101
VSY
L1
CR4
1
3
4
Q1
VOUT
R10
TR
5
R8
6
R11
R13
+
CR5
R5
R6
R9
R12
C6
R14
GND
CR1
+
R1
R2
C5
CR3
R7
R3
VSYNC
VD
VCC
VC
CS5101
SSPR
VREF
CR2
LGND
PGND
VFB
+
C1
C2
R4
VG
C4
IS COMP
COMP
IS−
RAMP
IS+
2
C3
CR
Figure 1. Application Diagram
MAXIMUM RATINGS
Rating
Value
Unit
Power Supply Voltage, VCC
−0.3 to 45
V
VSYNC and Output Supply Voltages, VC, VG, VSYNC, VD
−0.3 to 75
V
VIS+, VIS− (VCC − 4.0 V, up to 24 V)
−0.3 to 24
V
VREF, VFB, VCOMP, VRAMP, VISCOMP
−0.3 to 10
V
Operating Junction Temperature, TJ
−40 to +150
°C
Operating Temperature Range
−40 to +85
°C
Storage Temperature Range
−65 to +150
°C
Output Energy (Capacitive Load Per Cycle)
5.0
mJ
ESD Human Body
2.0
kV
260 peak
230 peak
°C
°C
Lead Temperature Soldering
Wave Solder (through hole styles only) (Note 1)
Reflow (SMD styles only) (Note 2)
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. 10 second maximum
2. 60 second maximum above 183°C
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2
CS5101
ELECTRICAL CHARACTERISTICS (−40°C ≤ TA ≤ 85°C, −40°C ≤ TJ ≤ 150°C, 10 V < VCC < 45 V, 8.0 V < VC < 75 V; unless
otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Error Amplifier
Input Voltage Initial Accuracy
VFB = VCOMP, VCC = 15 V, T = 25°C, Note 3
1.98
2.00
2.02
V
Input Voltage
VFB = VCOMP, includes line and temp
1.94
2.00
2.06
V
Input Bias Current
VFB = 0 V, IVFB flows out of pin
−
−
500
nA
Open Loop Gain
1.5 V < VCOMP < 3.0 V
60
70
−
dB
Unity Gain Bandwidth
1.5 V < VCOMP < 3.0 V, Note 3
0.7
1.0
−
MHz
Output Sink Current
VCOMP = 2.0 V, VFB = 2.2 V
2.0
8.0
−
mA
Output Source Current
VCOMP = 2.0 V, VFB = 1.8 V
2.0
6.0
−
mA
VCOMP High
VFB = 1.8 V
3.3
3.5
3.7
V
VCOMP Low
VFB = 2.2 V
0.85
1.0
1.15
V
PSRR
10 V < VCC < 45 V, VFB = VCOMP, Note 3
60
70
−
dB
Output Voltage Initial Accuracy
VCC = 15 V, T = 25°C, Note 3
4.9
5.0
5.1
V
Output Voltage
0 A < IREF < 8.0 mA
4.8
5.0
5.2
V
Line Regulation
10 V < VCC < 45 V, IREF = 0 A
−
10
60
mV
Load Regulation
0 A < IREF < 8.0 mA
−
20
60
mV
Current Limit
VREF = 4.8 V
10
50
−
mA
VREF−OK FAULT V
VSYNC = 5.0 V, VREF = VLOAD
4.10
4.40
4.60
V
VREF−OK V
VSYNC = 5.0 V, VREF = VLOAD
4.30
4.50
4.80
V
40
100
250
mV
Voltage Reference
VREF−OK Hysteresis
−
Current Sense Amplifier
IS COMP High V
IS+ = 5.0 V, IS− = IS COMP
4.7
5.0
5.3
V
IS COMP Low V
IS+ = 0 V, IS− = IS COMP
0.5
1.0
1.3
V
Source Current
IS+ = 5.0 V, IS− = 0 V
2.0
10
−
mA
Sink Current
IS− = 5.0 V, IS+ = 0 V
10
20
−
mA
Open Loop Gain
1.5 V ≤ VCOMP ≤ 4.5 V, RL = 4.0 kW
60
80
−
dB
CMRR
Note 3
60
80
−
dB
PSRR
10 V < VCC < 45 V, Note 3
60
80
−
dB
Unity Gain Bandwidth
1.5 V ≤ VCOMP ≤ 4.5 V, RL = 4.0 kW, Note 3
0.5
0.8
−
MHz
Input Offset Voltage
VIS+ = 2.5 V, VIS− = VISCOMP
−8.0
0
8.0
mV
Input Bias Currents
VIS+ = VIS− = 0 V, IIS flows out of pins
−
20
250
nA
Input Offset Current (IS+, IS−)
−250
0
250
nA
Note 3
−0.3
−
VCC − 4.0
V
RAMP Source Current Initial Accuracy
VSYNC = 5.0 V, VRAMP = 2.5 V, T = 25°C, Note 3
0.18
0.20
0.22
mA
RAMP Source Current
VSYNC = 5.0 V, VRAMP = 2.5 V
0.16
0.20
0.24
mA
RAMP Sink Current
VSYNC = 0 V, VRAMP = 2.5 V
1.0
4.0
−
mA
RAMP Peak Voltage
VSYNC = 5.0 V
3.3
3.5
3.7
V
RAMP Valley Voltage
VSYNC = 0 V
1.4
1.5
1.6
V
RAMP Dynamic Range
VRAMPDR = VRAMPPK − VRAMPVY
1.7
2.0
2.3
V
RAMP Sleep Threshold Voltage
VRAMP @ VREF < 2.0 V
0.3
0.6
1.0
V
SYNC Threshold
VSYNC @ VRAMP > 2.5 V
2.3
2.5
2.7
V
−
1.0
20
mA
Input Signal Voltage Range
−
RAMP/SYNC Generator
SYNC Input Bias Current
VSYNC = 0 V, ISYNC flows out of pin
3. Guaranteed by design. Not 100% tested in production.
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3
CS5101
ELECTRICAL CHARACTERISTICS (−40°C ≤ TA ≤ 85°C, −40°C ≤ TJ ≤ 150°C, 10 V < VCC < 45 V, 8.0 V < VC < 75 V;
unless otherwise specified.)
Characteristic
Test Conditions
Min
Typ
Max
Unit
Output Stage
VG, High
VSYNC = 5.0 V, IVG = 200 mA, VC − VG
−
1.6
2.5
V
VG, Low
VSYNC = 0 V, IVG = 200 mA
−
0.9
1.5
V
VG Rise Time
Switch VSYNC High, CG = 1.0 nF, VCC = 15 V,
measure 2.0 V to 8.0 V
−
30
75
ns
VG Fall Time
Switch VSYNC Low, CG = 1.0 nF, VCC = 15 V,
measure 8.0 V to 2.0 V
−
40
100
ns
VG Resistance to GND
Remove supplies, VG = 10 V
−
50
100
kW
VD Resistance to GND
Remove supplies, VD = 10 V
500
1500
−
W
General
ICC, Operating
VSYNC = 5.0 V
−
12
18
mA
ICC in UVL
VCC = 6.0 V
−
300
500
mA
ICC in Sleep Mode High
VRAMP = 0 V, VCC = 45 V
−
80
200
mA
ICC in Sleep Mode Low
VRAMP = 0 V, VCC = 10 V
−
20
50
mA
IC, Operating High
VSYNC = 5.0 V, VFB = VIS− = 0 V, VC = 75 V
−
4.0
8.0
mA
IC, Operating Low
VSYNC = 5.0 V, VFB = VIS− = 0 V, VC = 8.0 V
−
3.0
6.0
mA
UVLO Start Voltage
−
7.4
8.0
9.2
V
UVLO Stop Voltage
−
6.4
7.0
8.3
V
−
UVLO Hysteresis
0.8
1.0
1.2
V
Leading Edge, tDELAY
VSYNC = 2.5 V to VG = 8.0 V
−
280
−
ns
Trailing Edge, tDELAY
VSYNC = 2.5 V to VG = 2.0 V
−
750
−
ns
PACKAGE PIN DESCRIPTION
PACKAGE LEAD #
PDIP−14
SO−16WB
LEAD SYMBOL
1
1
SYNC
2
2
VCC
Logic supply (10 V to 45 V).
3
3
VREF
5.0 V voltage reference.
4
−
LGND
Logic level ground (analog and digital ground tied).
5
6
VFB
6
7
COMP
Error amplifier output and compensation.
7
8
RAMP
RAMP programmable with the external capacitor.
8
9
IS+
Current sense amplifier non−inverting input.
9
10
IS−
Current sense amplifier inverting input.
10
11
IS COMP
11
12, 13
PGND
12
14
VG
External power switch gate drive.
13
15
VC
Output power stage supply voltage (8.0 V to 75 V).
14
16
VD
External FET DRAIN voltage monitor.
−
5
AGND
Analog ground.
−
4
DGND
Digital ground.
FUNCTION
Synchronization input.
Error amplifier inverting input.
Current sense amplifier compensation and output.
Power ground.
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4
CS5101
ORDERING INFORMATION
Device
Shipping †
Package
CS5101EN14
PDIP−14
CS5101EN14G
PDIP−14
(Pb−Free)
CS5101EDW16
SOIC−16WB
CS5101EDW16G
SOIC−16WB
(Pb−Free)
CS5101EDWR16
SOIC−16WB
CS5101EDWR16G
SOIC−16WB
(Pb−Free)
25 Units / Rail
47 Units / Rail
1000 / Tape & Reel
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
CIRCUIT DESCRIPTION
VCC
VD
VCC
VC
REF
VREF
5.0 V
OK
+
SLEEP
−
+
UVL +
−
+
− 8.0 V/7.0 V
LGND
−
+
VG
0.7 V +−
IS
EA
10 k
−
BUF
+
10 k
VC
Q
I = 200 mA
5.0 V
G1
S
Q
+
IS+
5.0 V
R
0.7 V +−
−
VCC−OK
+
+
REF_OK
−
5.0 V
+
SYNC
−
IS−
Q3
5.0 V
Q4
−
LATCH
+ 1.5 V
−
+
RAMP
−
+
− 1.65 V
IS COMP
5.0 V
−
−
+ PWM
+
+ 2.4 V
−
5.0 V
COMP
SYNC
PGND
5.0 V
24.6 k
+ 2.0 V
−
RAMP
Q2
VCC
5.0 V
VFB
Q1
+
− 4.5 V/4.4 V
G2
+
− 2.5 V
Figure 2. Block Diagram
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5
VCC
CS5101
Theory of Operation
The logic state of the LATCH can be changed only when
both the voltage level of the trailing edge of the power pulse
at the SYNC pin is less than the threshold voltage of the
SYNC comparator (2.5 V) and the RAMP voltage is less than
the threshold voltage of the RAMP comparator (1.65 V). On
the negative going transition of the secondary side pulse
VSY, gate G2 output goes high, resetting the latch at time t3.
Capacitor CR is discharged through transistor Q4. CR’s
output goes low disabling the output stage, and the external
power switch (an N−FET) is turned off.
The CS5101 is designed to regulate voltages in multiple
output power supplies. Functionally, it is similar to a
magnetic amplifier, operating as a switch with a delayed
turn−on. It can be used with both single ended and dual
ended topologies.
The VFB voltage is monitored by the error amplifier EA.
It is compared to an internal reference voltage and the
amplified differential signal is fed through an inverting
amplifier into the buffer, BUF. The buffered signal is
compared at the PWM comparator with the ramp voltage
generated by capacitor CR. When the ramp voltage VR,
exceeds the control voltage VC, the output of the PWM
comparator goes high, latching its state through the LATCH,
the output stage transistor Q1 turns on, and the external
power switch, usually an N−FET, turns on.
RAMP Function
The value of the ramp capacitor CR is based on the
switching frequency of the regulator and the maximum duty
cycle of the secondary pulse VSY.
If the RAMP pin is pulled externally to 0.3 V or below, the
SSPR is disabled. Current drawn by the IC is reduced to less
than 100 mA, and the IC is in SLEEP mode.
SYNC Function
The SYNC circuit is activated at time t1 (Figure 3) when
the voltage at the SYNC pin exceeds the threshold level
(2.5V) of the SYNC comparator. The external ramp
capacitor CR is allowed to charge through the internal
current source I (200 mA). At time t2, the ramp voltage
intersects with the control voltage VC and the output of the
PWM comparator goes high, turning on the output stage and
the external power switch. At the same time, the PWM
comparator is latched by the RS latch, LATCH.
1
FAULT Function
The voltage at the VCC pin is monitored by the
undervoltage lockout comparator with hysteresis. When
VCC falls below the UVL threshold, the 5.0 V reference and
all the circuitry running off of it is disabled. Under this
condition the supply current is reduced to less than 500 mA.
The VCC supply voltage is further monitored by the
VCC_OK comparator. When VCC is reduced below VREF
− 0.7 V, a fault signal is sent to gate G1 . This fault signal,
which determines if VCC is absent, works in conjunction
with the ramp signal to disable the output, but only after the
current cycle has finished and the RS latch is reset.
Therefore this fault will not cause the output to turn off
during the middle of an on pulse, but rather will utilize
lossless turn−off. This feature protects the FET from
overvoltage stress. This is accomplished through gate G1 by
driving transistor Q4 on.
An additional fault signal is derived from the REF_OK
comparator. VREF is monitored so to disable the output
through gate G1 when the VREF voltage falls below the OK
threshold. As in the VCC_OK fault, the REF_OK fault
disables the output after the current cycle has been
completed. The fault logic will operate normally only when
VREF voltage is within the specification limits of REF_OK.
VSY
VSY
0V
VC
2
VRAMP
VSY + VD
3
VDS
0V
VSY
4
VD
0V
VSY − VOUT
5
0V
VL1
DRAIN Function
VG
The drain pin, VD monitors the voltage on the drain of the
power switch and derives energy from it to keep the output
stage in an off state when VC or VCC is below the minimum
specified voltage.
VOUT + VD
VSY + VC
6
VS
VD
0V
Ground Level
(Gate doesn’t go
below GND)
t1 t2 t3
t4 t1
Figure 3. Waveforms for CS5101. The Number to
the Left of Each Curve Refers to a Node On the
Application Diagram on Page 2.
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6
CS5101
S1
C1
1.0 mF
R6
10 k
R1
100 k
VSYNC
VD
VCC
VC
CS5101
VREF
VG
LGND
PGND
VFB
IS COMP
COMP
IS−
RAMP
IS+
R3
5.0 k
C4
0.1 mF
8.0 V − 45 V
R2
100 k
V1
100 kHz
0 V to 5.0 V Square Wave
C2
0.1 mF
SW SPST
R7
10 k
C5
680 pF
C3
1.0 nF
R4
2.2 k
R5
10 k
Figure 4. CS5101 Bench Test on DIP−14 Package
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7
CS5101
PACKAGE DIMENSIONS
PDIP−14
CASE 646−06
ISSUE P
14
8
1
7
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
B
A
F
L
N
C
−T−
SEATING
PLANE
H
G
D 14 PL
J
K
0.13 (0.005)
M
M
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8
DIM
A
B
C
D
F
G
H
J
K
L
M
N
INCHES
MIN
MAX
0.715
0.770
0.240
0.260
0.145
0.185
0.015
0.021
0.040
0.070
0.100 BSC
0.052
0.095
0.008
0.015
0.115
0.135
0.290
0.310
−−−
10 _
0.015
0.039
MILLIMETERS
MIN
MAX
18.16
19.56
6.10
6.60
3.69
4.69
0.38
0.53
1.02
1.78
2.54 BSC
1.32
2.41
0.20
0.38
2.92
3.43
7.37
7.87
−−−
10 _
0.38
1.01
CS5101
PACKAGE DIMENSIONS
SOIC−16WB
CASE 751G−03
ISSUE C
A
D
9
h X 45 _
E
0.25
H
8X
M
B
M
16
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INLCUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.13 TOTAL IN
EXCESS OF THE B DIMENSION AT MAXIMUM
MATERIAL CONDITION.
q
1
MILLIMETERS
DIM MIN
MAX
A
2.35
2.65
A1 0.10
0.25
B
0.35
0.49
C
0.23
0.32
D 10.15 10.45
E
7.40
7.60
e
1.27 BSC
H 10.05 10.55
h
0.25
0.75
L
0.50
0.90
q
0_
7_
8
16X
M
14X
e
T A
S
B
S
A1
L
A
0.25
B
B
SEATING
PLANE
C
T
PACKAGE THERMAL DATA
Parameter
PDIP−14
SOIC−16WB
Unit
RqJC
Typical
23
48
°C/W
RqJA
Typical
105
85
°C/W
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
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PUBLICATION ORDERING INFORMATION
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9
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For additional information, please contact your local
Sales Representative
CS5101/D