ON Semiconductor CS51220 Technical data
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CS51220
Feed Forward Voltage
Mode PWM Controller
with Programmable
Synchronization
CS51220 is a single output PWM Controller with switching
frequency up to 500 kHz. The feed forward voltage mode control
provides excellent line regulation for wide input range. This PWM
controller has a synchronization output allowing programmable phase
delay. For overcurrent protection, the “soft hiccup” technique
effectively limits the output current with maximum flexibility. In
addition, this device includes such features as: soft start,
pulse–by–pulse current limit, programmable foldback current limit,
volt–second clamping, maximum duty cycle, overvoltage and
undervoltage protection, and synchronization input. The CS51220 is
available in 16 SO narrow surface mount package.
Features
• Constant Frequency Feed Forward Voltage Mode Control
• Programmable Pulse by Pulse Overcurrent Limit
• Programmable Foldback Overcurrent Limit with Delay
• Soft Hiccup Overcurrent Protection with Programmable Foldback
• Frequency Synchronization Output with Programmable Phase Delay
• Synchronization Input to Higher or Lower Frequency
• Direct Connection to External Opto Isolators
• Logic Gate Output Signal
• Accurate Volt–Second Clamping
• Programmable Soft Start
• Logic Input to Disable IC
• Line Overvoltage and Undervoltage Monitoring
• 3.3 V 3% Reference Voltage Output
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16
1
SO–16
D SUFFIX
CASE 751B
PIN CONNECTIONS AND
MARKING DIAGRAM
1
O
GND
CC
REF
SET
SENSE
UV
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
CS51220
AWLYWW
16
SYNCOV
V
SD
SSV
COMPV
FFI
DISABLEI
SYNCIOV
C
T
Semiconductor Components Industries, LLC, 2002
January , 2002 – Rev. 6
ORDERING INFORMATION
Device Package Shipping
CS51220ED16
CS51220EDR16
1 Publication Order Number:
SO–16
SO–16 2500 Tape & Reel
48 Units/Rail
CS51220/D
CS51220
R4
D3
10
MMSD4148T1
L1
T1
D4
MMSD4148T1
100
R13
OUT
V
6.8 µH
D5B
MBRB2535CTL
70:1
R15
10 k
36
R14
C12
100 pF
3.3 V @
T2
5.0 A
C17
R23
330 µF
10
20:5
RTN
V
C18
330 µF
D5A
MBRB2535CTL
C12
680 pF
O
R21
R16
U4
10
C10
Q1
DD
V
OUT
DD
INA
V
0.1 µF
40.2 k
C13
100 pF
MTB20N20E
OUT
GNDGND
NCP4414
NC
200 V
C15
R20
R22
0.022 µF
C14
2.21 k
R19
R17
24.3 k
3.92 k
182
100 pF
U3
R18
1.0 K
U2
MOC213
TLV431ASNT1
R24
3.3 k
R3
10
C5
0.1 µF
U1
D2 15 V
R1
L2
100 k
C3
100 V
1.5 µF
36–72 V
1.0 µH
C1
0.2 µF
IN
V
100 V
R2
174 k
GND
Q2
MMFT1N10E
C4
C2
0.1 µF
MMSZ5245B
D1 9.1 V
MMSZ5239B
470 pF
500 V
CC
V
FF
V
SENSE
I
REF
R7
150 k
R5
10 k
O
SS
GND
SYNCI
SYNCO
CS51220
DISABLECOMP
ENABLE
SYNC IN
C7
1000 pF
R8
64.9 k
SYNC OUT
R11
510 k
R9
510 k
SET
OV
UV
I
VSDCTV
C8
390 pF
R6
7.5 k
C6
0.1 µF
R12
R10
11.8 k
15 k
C11
C9
1000 pF
1.0 µF
R23
220
R14
2.0 k
Figure 1. Application Diagram, 48 V to 3.3 V Converter
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2
CS51220
MAXIMUM RATINGS*
Rating Value Unit
Operating Junction Temperature, T
Storage Temperature Range, T
J
S
ESD Susceptibility (Human Body Model) 2.0 kV
Thermal Resistance, Junction–to–Case, R
Thermal Resistance, Junction–to–Ambient, R
Θ
JC
Θ
JA
Lead Temperature Soldering: Reflow: (SMD styles only) (Note 1) 230 peak °C
1. 60 second maximum above 183°C.
*The maximum package power dissipation must be observed.
MAXIMUM RATINGS
Pin Name Pin Symbol V
Gate Logic Output V
Current Sense Input I
Timing Capacitor C
O
SENSE
T
MAX
20 V –0.3 V 100 mA 100 mA
6.0 V –0.3 V 10 mA 10 mA
6.0 V –0.3 V 10 mA 10 mA
Feed Forward FF 6.0 V –0.3 V 10 mA 100 mA
Error Amp Output COMP 6.0 V –0.3 V 10 mA 10 mA
Feedback Voltage V
FB
6.0 V –0.3 V 10 mA 10 mA
Sync Input SYNCI 20 V –0.3 V 10 mA 10 mA
Power Down Input DISABLE 20 V –0.3 V 10 mA 10 mA
Undervoltage UV 6.0 V –0.3 V 10 mA 10 mA
Overvoltage OV 6.0 V –0.3 V 10 mA 10 mA
Current Set I
SET
6.0 V –0.3 V 10 mA 10 mA
Soft Start SS 6.0 V –0.3 V 10 mA 10 mA
Power Supply V
CC
20 V –0.3 V 10 mA 50 mA
Sync Output SYNCO 20 V –0.3 V 100 mA 100 mA
Reference Voltage V
Sync Delay V
REF
SD
6.0 V –0.3 V Internally Limited 10 mA
6.0 V –0.3 V 1.0 mA 1.0 mA
Ground GND N/A N/A 50 mA N/A
V
MIN
I
SOURCE
150 °C
–65 to +150 °C
28 °C/W
115 °C/W
I
SINK
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3
CS51220
ELECTRICAL CHARACTERISTICS (–40°C < T
< 85°C; –40°C < TJ < 125°C; 4.7 V < VCC < 16 V; CT = 390 pF; unless
A
otherwise specified.)
Characteristic
Test Conditions Min Typ Max Unit
Supply Voltage/Current
Start Threshold – 4.0 4.4 4.7 V
Stop Threshold – 3.3 3.8 4.1 V
Hysteresis Start – Stop 400 600 1000 mV
ICC @ Startup VCC < UVL Start Threshold – – 500 µA
ICC Operating, Low V
ICC Operating, High V
CC
CC
4.7 V < VCC < 10 V – – 7.5 mA
10 V < VCC < 16 V – – 9.0 mA
Reference Voltage
Total Accuracy 0 mA < I
Line Regulation I
REF
Load Regulation 0 mA < I
< 2.0 mA 3.2 3.3 3.4 V
REF
= 2.0 mA – 6.0 20 mV
< 2.0 mA, VCC = 8.0 V – 6.0 15 mV
REF
Operating Life Shift T = 1000 Hrs., Note 2 – 4.0 20 mV
Fault Voltage – 2.8 2.95 3.1 V
V
OK Voltage – 2.9 3.05 3.2 V
REF
V
OK Hysteresis – 50 100 150 mV
REF
Current Limit V
= 2.5 V 2.0 25 65 mA
REF
Oscillator
Frequency Accuracy – 223 266 309 kHz
Temperature Stability Note 2 – 8.0 – %
Max Frequency Note 2 500 – – kHz
Duty Cycle – 80 85 90 %
Peak Voltage Note 2 1.9 2.0 2.1 V
Valley Voltage Note 2 0.85 0.90 0.98 V
Discharge Current VCT = 1.5 V 0.70 0.85 1.05 mA
Charge Current VCT = 1.5 V 127 150 183 µA
Synchronization
SYNCI Input Threshold f
SYNCI Input Resistance V
= 500 kHz 1.0 2.0 3.0 V
SYNC
= 0.5 50 150 250 kΩ
SYNC
Minimum Sync Frequency Reduction of nominal frequency. 25 – – %
Minimum Input Sync Pulse Width – – – 200 ns
SYNCO Output High R
= 5.0 k, VCC = 8.0 V 5.0 6.5 7.5 V
SYNCO
SYNCO Output Low Sink 1.0 mA, VSD = 2.5 V – 0.2 0.4 V
SYNCO Delay Time VCT = 1.5 V, Toggle V
SD
100 200 300 ns
2. Guaranteed by design. Not tested in production.
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4
CS51220
ELECTRICAL CHARACTERISTICS (continued) (–40°C < T
< 85°C; –40°C < TJ < 125°C; 4.7 V < VCC < 16 V; CT = 390 pF; unless
A
otherwise specified.)
Characteristic UnitMaxTypMinTest Conditions
Output (continued)
High Saturation Voltage VCC – VO, V
Low Saturation Voltage VO – GND, I
Pull Down Resistance I
= 100 µA 25 50 75 kΩ
SINK
= 10 V, I
CC
= 100 µA – 0.7 1.0 V
SINK
= 100 µA – 1.4 2.0 V
SOURCE
Rise Time VCC = 10 V, 1.0 V < VO < 6.0 V; 50 pF load – 35 80 ns
Fall Time VCC = 10 V, 1.0 V < VO < 6.0 V; 50 pF load – 25 50 ns
Feed Forward
Discharge Voltage IFF = 2.0 mA 0.25 0.35 0.45 V
Discharge Current FF = 1.0 V 2.0 10 30 mA
FF to VO Delay Connect VO to FF, Measure min. pulse width. 50 75 150 ns
FF Clamp Voltage – 1.15 1.3 1.45 V
COMP Switch Off Voltage VFF = 0.2 V, Ramp down V
VFF = 0.2 V, Ramp down V
COMP
COMP
–40°C
0.8
1.4
1.4
1.6
1.7
1.7
Overcurrent Protection
Overcurrent Comparator DC Offset – 180 200 215 mV
I
Attenuation ∆V
SENSE
I
Input Resistance ∆V
SENSE
I
to GATE Delay V
SENSE
I
Foldback Sink Current I
SET
/∆V
ISET
ISENSE
= 0 V 40 82 150 kΩ
ISENSE
= 0.5 V 50 100 175 ns
ISET
= 0.5 V, SS = 1.5 V and I
SET
= 0.5 V 12 15 18 µA
SENSE
0.9 0.94 0.98 V/V
External Voltage Monitors
Overvoltage Threshold OV pin increasing 1.9 2.0 2.1 V
OV Hysteresis Current OV = 2.15 V 10 12.5 15 µA
Undervoltage Threshold UV pin decreasing 0.95 1.00 1.05 V
UV Hysteresis – 25 75 125 mV
Soft Start
Charge Current SS = 1.5 V 35 50 65 µA
Discharge Current SS = 1.5 V, UV = 1.5 V 4.0 5.0 7.0 µA
OC Delay Discharge Current SS = 2.85 V, I
SET
= 0.5, I
= 0.5 V 35 50 65 µA
SENSE
SS Clamp Voltage – 2.7 2.9 3.1 V
Discharge Voltage – 0.25 0.3 0.35 V
Soft Start Fault Voltage OV = 2.5 V or UV = 0.85 V – 0.1 0.2 V
Hiccup Delay Discharge Voltage – 0.08 0.1 0.12 V
Disable
DISABLE Input Threshold – 1.0 2.0 3.0 V
DISABLE Input Resistance V
DISABLE Operation Current, Low V
DISABLE Operation Current, High V
CC
CC
4.7 V < VCC < 10 V – – 800 µA
10 V < VCC < 16 V – – 1600 µA
= 0.5 V 50 150 250 kΩ
DISABLE
V
V
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