The Si9118/Si9119 are a BiC/DMOS current-mode pulse
width modulation (PWM) controller ICs for high-frequency
dc/dc converters. Single-ended topologies (forward and
flyback) can be implemented at frequencies up to 1 MHz.
The controller operates in constant frequency mode during
the full load and automatically switches to pulse skipping
mode under light load to maintain high efficiency throughout
the full load range. The maximum duty cycle is easily
programmed with a resistor divider for optimum control.
The push-pull output driver provides high-speed switching to
external MOSPOWER devices large enough to supply 50 W
of output power. Shoot-through current for internal push-pull
stage is almost eliminated to minimize quiescent supply
current.
The push-pull output driver provides high-speed switching to
external MOSPOWER devices large enough to supply 50 W
of output power. Shoot-through current for internal push-pull
stage is almost eliminated to minimize quiescent supply
current.
The high-voltage DMOS transistor permits direct operation
from bus voltages of up to 200 V. Other features include a
1.5 % accurate voltage reference, 2.7 MHz bandwidth error
amplifier, standby mode, soft-start and undervoltage lockout
circuits.
The Si9118/Si9119 are available in both standard and lead
(Pb)-free packages.
FEATURES
• 10 to 200 V Input Range
• Current-Mode Control
• Internal Start-Up Circuit
• Buffer Slope Compensation Voltage
• Soft-Start
• 2.7 MHz Error Amp
• 500 mA Output Drive Current
• Light Load Frequency Fold-Back
• Low Quiescent Current
• Programmable Maximum Duty Cycle, with 80 % as
Default
FUNCTIONAL BLOCK DIAGRAM
LIMIT
CS
5
Error
Amplifier
4
–
+
6
10
11
2
SYNC (Si9119)
12
MAX
13
9
1.0 - 2.0
V
+ –
–
+
PWM
R
OSC
C
OSC
OSC
8
NI
3
V
REF
Ref
Gen
4.6
V
23µA
100 mV
Pulse Skip
+
EN
–
I
MAX
600 mV
–V
IN
+
–
Substrate
R
Q
S
14
-V
IN
15
DR
SS/EN
7
V
CC
16
+V
IN
1
–
–
+
+
8.6 V
–
+
9.3
V
(V
REG
)
Undervoltage
Lockout
Document Number: 70815
S11-0975–Rev. E, 16-May-11
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1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9118, Si9119
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
(T
A
= 25 °C, unless otherwise noted)
Parameter
Voltage Reference V
CC
to V
IN
+V
IN
( Note: V
CC
< + V
IN
+ 0.3 V)
Logic Input (SYNC)
Linear Input (FB, I
CS
, I
LIMIT
, SS/EN)
HV Pre-Regulator Input Current (continuous)
Storage Temperature
Operating Temperature
D
MAX
Junction Temperature (T
J
)
Power Dissipation (Package)
a
16-Pin SOIC (Y Suffix)
b
Thermal Impedance (θ
JA
)
16-Pin SOIC
Notes:
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.2 mW/°C above 25 °C.
*
Exposure to Absolute Maximum rating conditions for extended periods may affect device reliability. Stresses above Absolute Maximum rating
may cause permanent damage. Functional operation at conditions other than the operating conditions specified is not implied. Only one
Absolute Maximum rating should be applied at any one time.
Symbol
Limit
18
200
- 0.3 to V
cc
+ 0.3
- 0.3 to V
cc
+ 0.3
5
- 65 to 150
- 40 to 85
3.2
150
900
140
°C
V
°C
mW
°C/W
mA
V
Unit
RECOMMENDED OPERATING RANGE
Parameter
Voltage Reference V
cc
to V
IN
+V
IN
f
OSC
R
OSC
C
OSC
Linear Inputs
Digital Inputs
Limit
10 to 16.5
10 to 200
40 kHz to 1 MHz
56 kΩ to 1 MΩ
47 to 200
0 to V
cc
- 4
0 to V
cc
pF
V
V
V
Unit
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
- V
IN
= 0 V, V
CC
= 10 V
Limits
D Suffix - 40 to 85 °C
Temp.
a
Min.
Typ.
b
Max.
Unit
Parameter
Reference
Symbol
OSC Disabled, T
A
= 25 °C
Output Voltage
V
REF
I
SREF
ΔV
R
/ΔI
R
OSC Disabled, Over Voltage and
Temperature Ranges
c
Short Circuit Current
Load Regulation
V
REF
= -V
IN
I
REF
= 0 to - 1mA
Room
Full
3.94
3.88
4.0
4.0
- 30
10
4.06
V
4.12
-5
40
mA
mV
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Document Number: 70815
S11-0975–Rev. E, 16-May-11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9118, Si9119
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
- V
IN
= 0 V, V
CC
= 10 V
Limits
D Suffix - 40 to 85 °C
Temp.
a
Min.
Typ.
b
Max.
Unit
Parameter
Oscillator
Initial Accuracy
d
Voltage Stability
c
Temperature Coefficient
c
Sync High Pulse Width (Si9119)
Sync Low Pulse Width (Si9119)
Sync Rise/Fall Time (Si9119)
Sync Logic Low (Si9119)
Sync Logic High (Si9119)
Sync Range
c
(Si9119)
PWM/PSM
PWM/PSM Logic High
PWM/PSM Logic Low
D
MAX
Accuracy
Error Amplifier (OSC Disabled)
Input BIAS Current
Input OFFSET Voltage
Open Loop Voltage Gain
c
Unity Gain Bandwidth
c
Output Current
Power Supply Rejection
Pre-Regulator/Start-up
Input Voltage
c
Input Leakage Current
Pre-Regulator Start-Up Current
V
CC
Pre-Regulator Turn-Off
Threshold Voltage
Undervoltage Lockout
V
REG
- V
UVLO
Supply
Supply Current
Symbol
f
OSC
f
OSCc
Δf/f
OSC TC
R
OSC
= 374 kΩ, C
OSC
= 200 pF
R
OSC
= 70 kΩ, C
OSC
= 200 pF
R
OSC
= 70 kΩ, C
OSC
= 200 pF
Δf/f
= [f(16.5 V) - f(9.5 V)] / f(9.5 V)
- 40
≤
T
A
≤
85 °C, f
OSC
= 100 kHz
90
450
100
500
1
200
110
kHz
550
2
500
%
ppm/°C
200
200
200
V
IL
V
IH
f
EXT
4
1.05 x f
OSC
kHz
0.8
V
ns
V
IH
V
IL
4
V
0.8
f
OSC
= 100 kHz with 1 % Resistor
± 10
%
I
FB
V
OS2
A
VOL
BW
I
OUT
PSRR
V
FB
= 5 V, NI = V
REF
< 1.0
±5
65
1.8
80
2.7
- 2.7
± 200
± 25
nA
mV
dB
MHz
mA
Source (V
FB
= 3.5 V, NI = V
REF
)
Sink (V
FB
= 4.5 V, NI = V
REF
)
10 V
≤
V
CC
≤
16.5 V
- 1.0
1.0
50
2.4
80
dB
+V
IN
+I
IN
I
START
V
REG
V
UVLO
V
DELTA
I
IN
= 10
µA
V
CC
≥
10 V
Pulse Width
≤
300
µs,
V
CC
= V
ULVO
I
PRE_REGULATOR
= 15
µA
Room
Room
Room
Room
Room
Room
200
10
8
8.7
8.0
0.3
15
9.3
8.6
0.7
9.8
9.3
V
µA
mA
V
I
CC
C
LOAD
≤
50 pF, f
OSC
= 100 kHZ
1.9
3.0
mA
Document Number: 70815
S11-0975–Rev. E, 16-May-11
www.vishay.com
3
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9118, Si9119
Vishay Siliconix
SPECIFICATIONS
Test Conditions
Unless Otherwise Specified
- V
IN
= 0 V, V
CC
= 10 V
Limits
D Suffix - 40 to 85 °C
Temp.
a
Min.
Typ.
b
Max.
Unit
Parameter
Protection
Current Limit Treshold Voltage
Current Limit Delay to Output
c
Soft-Start Current
Output Inhibit Voltage
Pulse Skipping Threshold
Voltage
Mosfet Driver
Output High Voltage
Output Low Voltage
Output Resistance
c
Rise Time
c
Fall Time
c
Symbol
V
I(Limit)
t
d
I
SS
V
SS(off)
V
PS
V
FB
= 0, NI = V
REF
V
SENSE
0.85 V, See Figure 1
0.5
0.6
77
0.7
100
- 30
V
ns
µA
V
- 12
Soft-Start Voltage to Disable Driver Output
0.5
80
- 23
1.26
100
120
mV
V
OH
V
OL
R
OUT
t
r
t
r
I
OUT
= - 10 mA
I
OUT
= 10 mA
I
OUT
= 10 mA, Source or Sink
C
L
= 500 pF
Room
Full
Room
Full
Room
Full
Room
Room
V
CC
- 0.3
V
CC
- 0.5
0.3
0.5
30
50
75
V
20
25
40
40
Ω
ns
75
Notes:
a. Room = 25 °C, Full = as determined by the operating temperature suffix.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c. Guaranteed by design, not subject to production test.
d. C
STRAY
≤
5 pF on C
OSC
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.
TIMING WAVEFORMS
t
r
0.85
Current
Sense
50
%
0
t
d
Output
V
CC
10 ns
90
%
0
Figure 1.
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Document Number: 70815
S11-0975–Rev. E, 16-May-11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9118, Si9119
Vishay Siliconix
TYPICAL CHARACTERISTICS
(T
A
= 25 °C, unless noted)
2 x 1000
47 pF
O
u
tp
u
t Rise and Fall Time (ns)
100 pF
150 pF
200 pF
f OUT (kHz)
200
t
r
for C
L
= 2500 pF
150
t
f
for C
L
= 2500 pF
100
t
r
for C
L
= 1000 pF
t
f
for C
L
= 1000 pF
t
r
10
%
to 90
%
t
f
90
%
to 10
%
0
2 x 100
Note:
These curves
were
measured
in a
board with
3.5 pF of
external parasitic
capacitance.
2 x 10
10
100
r
OSC
– Oscillator Resistance (k )
1000
50
9
10
11
12
13
14
15
V
CC
– Supply
Voltage
(V)
16
17
Oscillator Frequency
36
32
28
I CC – S
u
pply C
u
rrent (mA)
24
C
L
= 2500 pF
20
16
12
8
C
L
= 0 pF
4
0
0
200
400
600
800
f
OUT
– Output Frequency (kHz)
1000
0
9
C
L
= 1000 pF
I CC – S
u
pply C
u
rrent (mA)
9
V
CC
= 12
V
C
OSC
= 47 pF
Output Driver Rise and Fall Time
12
R
OSC
= 127 k
C
OSC
= 47 pF
fs = 500 kHz
C
L
= 1000 pF
6
3
C
L
= 0 pF
10
11
12
13
14
15
V
CC
– Supply
Voltage
(V)
16
17
Supply Current vs. Output Frequency
1.05
R
OSC
= 56 k
C
OSC
= 100 pF
1.00
S
w
itching Fre
qu
ency (MHz)
Supply Current vs. Supply Voltage
0.95
0.90
0.85
8
9
10
11
12
13
14
15
V
CC
– Supply
Voltage
(V)
16
17
Switching Frequency vs. Supply Voltage
Document Number: 70815
S11-0975–Rev. E, 16-May-11
www.vishay.com
5
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
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