Si9113
New Product
Vishay Siliconix
High-Voltage Current Mode PWM Controller for
ISDN Power Supplies
FEATURES
D
D
D
D
D
BiC/DMOS Technology
Current Mode Control
Max 50% Duty Cycle Operation
1.3-MHz Error Amp
Up to 500-kHz Internal Oscillator
D
D
D
D
D
Soft-Start
0.6-V Fast Over-Current Protection
<5-mA Supply Current for +V
IN
<18 V
23.5-V to 200-V Input Voltage Range
Programmable Start/Stop Capability
D
Internal Start-Up Circuit
D
Power_Good Output
DESCRIPTION
Si9113 is a current mode PWM controller for ISDN power
supplies. In a 14-pin SOIC package, it provides all necessary
functions to implement a single-switch PWM with a minimum
of external parts. To maximize the circuit integration, the
Si9113 is designed with a 200-V depletion mode MOSFET
capable of powering directly off the high input bus without an
external start-up circuit. The Start and Stop input voltage
thresholds can be programmed within the operating input
voltage range by means of a resistor divider, provided +V
IN
(Start) > +V
IN
(Stop). The internal clock frequency is set with
a single external resistor and is capable of capacitor-coupled
external synchronization. In order to satisfy the stringent
ambient temperature requirements, the Si9113 is rated to
handle the industrial range of –40_C to 85_C.
FUNCTIONAL BLOCK DIAGRAM
V
IN
(23.5 V to 200 V)
V
OUT
Start-Up
Stop/Start
Drive
Current
Power_Good
Comparator
V
REF
= 1.3 V
Fast
Current
Limit
Comparator
For Detailed Block Diagram See Page 7
.
Document Number: 71093
S-99453—Rev. A . 29-Nov-99
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Si9113
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 V
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Logic Inputs (OSC IN, OSC OUT, PWR_GOOD) . . . –0.3 V to V
CC
+ 0.3 V
or
"10
mA
Linear Inputs (FB, V
REF
, SENSE, SS) . . . . . . . . . . . . –0.3 V to V
CC
+ 0.3 V
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65 to 150_C
Operating Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40 to 85_C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150_C
Power Dissipation (Package)a
14-Pin SOIC (Y Suffix)
b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 mW
Thermal Impedance (Q
JA
)
14-Pin SOIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 140_C/W
Notes
a. Device mounted with all leads soldered or welded to PC board.
b. Derate 7.2 mW/_C above 25_C.
New Product
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.
RECOMMENDED OPERATING RANGE
V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23.5 V to 200 V
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 V to 14 V
Digital Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
CC
Linear Outputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V
CC
– 3 V
F
OSC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 kHz to 500 kHz
SPECIFICATIONS
a
Test Conditions
Unless Otherwise Specified
Parameter
Reference
Output Voltage
Short Circuit Current
Load Regulation
Line Regulation
V
REF
I
SREF
DV
REF
OSC
IN
= – V
IN
(OSC Disabled)
R
L
= 10 MW
V
REF
= –V
IN
I
REF
= 0 to –0.5 mA
V
CC
= 10 to 14 V
Room
Full
Room
Full
Full
1.275
1.26
1.3
1.3
–25
"10
"2
1.325
1.34
–10
40
mV
5
V
mA
Limits
–40 to 85_C
Symbol
V
CC
= 10 V, +V
IN
= 48 V, R
OSC
= 390 kW
Temp
b
Min
c
Typ
d
Max
c
Unit
UVLO
Under Voltage Lockout
V
UVSTART
V
UVSTOP
I
START
I
STOP
Pre-Regulated V
CC
UVLO for V
CC
V
REG
– V
CCUV
V
REG
V
CCUV
VD
Turn-On
Turn-Off
V
STOP
= 8 V, V
START
= 8 V
Full
Full
Room
Room
Room
Room
Room
8.5
7.9
0.3
9.0
8.4
0.6
8.10
8.10
8.8
8.8
9.50
9.50
0.05
0.05
9.5
8.9
V
V
Input Bias Current
mA
PWR_Good Comparator
Rise Time
Fall Time
Output Logic Low
t
rpg
t
fpg
Room
C
PWR Good
= 100 nF
PWR_Good
I
SINK
= 2.5 mA
Room
Room
35
25
0.4
0.8
mS
mS
V
Soft-Start
SS Current
Output Inhibit Voltage
I
SS
V
SS
Room
Room
11
3.3
mA
V
Oscillator
Maximum Frequency
e
Initial Accuracy
Voltage Stability
Temperature Coefficient
e
Maximum Duty Cycle
f
MAX
f
OSC
Df/f
T
OSC
D
MAX
f
OSC
= 100 kHz
R
OSC
= 0
R
OSC
= 390 k (Note f)
R
OSC
= 180 k (Note
f
)
Df/f
= (f [14 V] – f [10 V]) / f [10 V]
Room
Room
Room
Room
Full
Room
500
80
160
100
200
10
450
50
120
240
15
650
%
ppm/_C
%
Document Number: 71093
S-99453—Rev. A . 29-Nov-99
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kH
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Si9113
New Product
SPECIFICATIONS
a
Test Conditions
Unless Otherwise Specified
Parameter
Error Amplifier
Open Loop Voltage Gain
e
Input BIAS Current
Feedback Input Voltage
Dynamic Output Impedance
e
Unity Gain Bandwidth
e
Output Current
Power Supply Rejection
e
A
VOL
I
BIAS
V
FB
Z
OUT
BW
I
OUT
PSRR
Source V
FB
= 0.8 V
Sink V
FB
= 1.8 V
OSC IN = – V
IN
V
FB
= 1.3 V
FB Tied to COMP, OSC IN = – V
IN
Room
Room
Full
Room
Room
Room
Room
Room
0.12
50
1
50
–1
1.28
1
1.3
–5
0.15
70
dB
–1
mA
60
1
1.32
2
dB
mA
V
kW
MHz
Vishay Siliconix
Limits
–40 to 85_C
Symbol
V
CC
= 10 V, +V
IN
= 48 V, R
OSC
= 390 kW
Temp
b
Min
c
Typ
d
Max
c
Unit
Current Limit Comparator
Threshold Voltage
Delay to Output
e
V
SOURCE
t
d
V
FB
= 0 V
V
SENSE
= 0.85 V, See Figure 1
Full
Full
0.5
0.6
100
0.7
150
V
ns
Output Drive
Output High Voltage
Output Low Voltage
Rise Time
Fall Time
V
OH
V
OL
t
r
t
f
I
OUT
= –10 mA
I
OUT
= 10 mA
C
L
= 500 p
pF
(10% t 90%)
to
Room
Full
Room
Full
Room
Room
40
40
9.7
9.5
0.3
0.5
75
ns
75
V
Supply
I
CC
Supply Current
I
VIN
Supply Current UVLO Mode
I
VIN
V
CC
= 10 V, R
OSC
= 390 kW
V
UVUP
vV
IN
v
200 V
Excluding I From Resistive Divider of
Stop and Start Pins
+V
IN
v
18 V, V
START
(Pin 14) < 8.8 V
Full
Room
Room
1
75
2
1.4
100
5
mA
m
mA
Notes
a. Refer to PROCESS OPTION FLOWCHART for additional information.
b. Room = 25_C, Full = –40 to 85_C.
c. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
d. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
e. Guaranteed by design, not subject to production test.
f.
C
STRAY
Pin 8 =
v
5 pF.
TIMING WAVEFORMS
0.85 V –
50%
t
d
V
CC
OUTPUT
0 –
90%
SENSE
0
t
r
v
10 ns
FIGURE 1.
Delay Time for Current Sense
Document Number: 71093
S-99453—Rev. A . 29-Nov-99
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Si9113
Vishay Siliconix
New Product
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
1.306
V
REF
vs. Temperature (V
IN
= 48 V)
9.1
9.0
V
UVSTART
/V
UVSTOP
(v)
8.9
8.8
8.7
8.6
8.5
V
UVSTART
/V
UVSTOP
vs. Temperature
V
CC
= 14 V
1.304
V
REF
– (V)
1.302
V
CC
= 12 V
V
CC
= 10 V
1.300
1.298
–50
–25
0
25
50
75
100
8.4
–50
–25
0
25
50
75
100
Temperature (_C)
Temperature (_C)
Output Frequency vs. Oscillator Resistance
300
2.0
Supply Current vs. Output Frequency
V
CC
= 10 V
F
OUT
(kHz)
I
CC
(mA)
1.6
V
CC
= 14 V
1.2
V
CC
= 10 V
V
CC
= 12 V
0.8
100
0.4
10
10
100
F
OSC
(kW)
1000
2000
0
0
50
100
150
F
OUT
(kHz)
200
250
300
Output Frequency vs. Supply Voltage
24
R
OSC
= 1 MW
22
85_C
F
OUT
(kHz)
–40_C
18
I
SS
(
m
A)
20
25_C
12
13
Soft-Start Current vs. Temperature
V
CC
= 10 V
11
10
9
16
8
14
9
10
11
12
V
CC
(V)
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14
15
7
–40
–20
0
20
40
60
80
100
Temperature (_C)
Document Number: 71093
S-99453—Rev. A . 29-Nov-99
4
Si9113
New Product
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Vishay Siliconix
UVLO Supply Current vs. V
IN
10
80
Output Rise Time vs. Load
V
CC
= 10 V
60
85_C
I
IN
(
(mA)
Rise/Fall Time (nS)
–40_C
0.1
11
13
15
V
IN
(V)
17
19
21
0
0
200
400
C
OUT
(pF)
600
800
V
IN
= 28 V
V
IN
= 48 V
V
IN
= 99 V
50
40
30
20
10
0
200
400
600
W
O
(mW)
800
1000
1
25_C
40
20
Efficiency vs. Output Power
90
80
70
Efficiency (%)
60
Document Number: 71093
S-99453—Rev. A . 29-Nov-99
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FaxBack 408-970-5600
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