1
General Description
The Supertex HV9110 through HV9113 are a series of BiCMOS/
DMOS single-output, pulse width modulator ICs intended for use
in high-speed high-efficiency switchmode power supplies. They
provide all the functions necessary to implement a single-switch
current-mode PWM, in any topology, with a minimum of external
parts.
Because they utilize Supertex's proprietary BiCMOS/DMOS tech-
nology, they require less than one tenth of the operating power of
conventional bipolar PWM ICs, and can operate at more than
twice their switching frequency. Dynamic range for regulation is
also increased, to approximately 8 times that of similar bipolar
parts. They start directly from any DC input voltages between 10
and 120VDC, requiring no external power resistor. The output
stage is push-pull CMOS and thus requires no clamping diodes
for protection, even when significant lead length exists between
the output and the external MOSFET. The clock frequency is set
with a single external resistor.
Accessory functions are included to permit fast remote shutdown
(latching or nonlatching) and undervoltage shutdown.
For similar ICs intended to operate directly from up to 450VDC
input, please consult the data sheet for the HV9120/9123.
Ordering Information
+V
IN
Feedback
Max
Package Options
Min
Max
Accuracy
Duty Cycle
10V
120V
<
1%
49%
HV9110P
HV9110PJ
HV9110NG
HV9110X
9.0V
80V
2%
49%
HV9112P
HV9112PJ
HV9112NG
HV9112X
10V
120V
<
1%
99%
HV9113P
HV9113PJ
HV9113NG
HV9113X
Standard temperature range for all parts is industrial (-40
to +85C).
Absolute Maximum Ratings
+V
IN
, Input Voltage
HV9110/9113
120V
HV9112
80V
V
DD
, Logic Voltage
15.5V
Logic Linear Input, FB and
Sense Input Voltage
-0.3V to V
DD
+0.3V
Storage Temperature
-65
C to 150C
Power Dissipation, SOIC
750mW
Power Dissipation, Plastic DIP
1000mW
Power Dissipation PLCC
1400mW
High-Voltage Current-Mode PWM Controller
Features
10 to 120V input range
Current-mode control
High efficiency
Up to 1.0MHz internal oscillator
Internal start-up circuit
Low internal noise
Applications
DC/DC converters
Distributed power systems
ISDN equipment
PBX systems
Modems
14 Pin
20 Pin
14 Pin
Die
Plastic DIP
Plastic PLCC
Narrow Body SOIC
For detailed circuit and application information, please refer
to application notes AN-H13 and AN-H21 to AN-H24.
HV9110
HV9112
HV9113
11/12/01
Supertex Inc. does not recommend the use of its products in life support applications and will not knowingly sell its products for use in such applications unless it receives an adequate "products liability
indemnification insurance agreement." Supertex does not assume responsibility for use of devices described and limits its liability to the replacement of devices determined to be defective due to
workmanship. No responsibility is assumed for possible omissions or inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications, refer to the
Supertex website: http://www.supertex.com. For complete liability information on all Supertex products, refer to the most current databook or to the Legal/Disclaimer page on the Supertex website.
2
HV9110/HV9112/HV9113
PWM
D
MAX
Maximum Duty Cycle
1
HV9110/12
49.0
49.4
49.6
%
HV9113
95
97
99
Deadtime
1
HV9113
225
nsec
D
MIN
Minimum Duty Cycle
0
%
Minimum Pulse Width
80
125
nsec
Before Pulse Drops Out
1
Current Limit
Maximum Input Signal
1.0
1.2
1.4
V
V
FB
= 0V
t
d
Delay to Output
1
80
120
ns
V
SENSE
= 1.5V, V
COMP
2.0V
Oscillator
f
MAX
Oscillator Frequency
1.0
3.0
MHz
R
OSC
= 0
f
OSC
Initial Accuracy
2
80
100
120
KHz
R
OSC
= 330K
160
200
240
R
OSC
= 150K
Voltage Stability
15
%
9.5V < V
DD
<13.5V
Temperature Coefficient
1
170
ppm/
C
T
A
= -55
C to 125C
Reference
V
REF
Output Voltage
HV9110/13
3.92
4.00
4.08
V
R
L
= 10M
HV9112
3.88
4.00
4.12
HV9110/13
3.82
4.00
4.16
R
L
= 10M
,
T
A
= -55
C to 125C
Z
OUT
Output Impedance
1
15
30
45
K
I
SHORT
Short Circuit Current
125
250
A
V
REF
= -V
IN
V
REF
Change in V
REF
with Temperature
1
0.25
mV/
C
T
A
= -55
C to 125C
Electrical Characteristics
(Unless otherwise specified, V
DD
= 10V, +V
IN
= 48V, Discharge = -V
IN
= 0V, R
BIAS
= 390K
, R
OSC
= 330K
,T
A
= 25
C.)
Symbol Parameters
Min
Typ
Max
Unit
Conditions
Error Amplifier
V
FB
Feedback Voltage
HV9110/13
3.96
4.00
4.04
V
V
FB
Shorted to Comp
HV9112
3.92
4.00
4.08
I
IN
Input Bias Current
25
500
nA
V
FB
= 4.0V
V
OS
Input Offset Voltage
nulled during trim
except HV9111
A
VOL
Open Loop Voltage Gain
1
60
80
dB
GB
Unity Gain Bandwidth
1
1.0
1.3
MHz
Z
OUT
Output Impedance
1
see Fig. 1
I
SOURCE
Output Source Current
-1.4
-2.0
mA
V
FB
= 3.4V
I
SINK
Output Sink Current
0.12
0.15
mA
V
FB
= 4.5V
PSRR
Power Supply Rejection
1
see Fig. 2
dB
Notes:
1. Guaranteed by design. Not subject to production test.
2. Stray capacitance on OSC In pin must be
5pF.
3
HV9110/HV9112/HV9113
Electrical Characteristics
(continued)
(Unless otherwise specified, V
DD
= 10V, +V
IN
= 48V, Discharge = -V
IN
= 0V, R
BIAS
= 390K
, R
OSC
= 330K
,T
A
= 25
C.)
Symbol Parameters
Min
Typ
Max
Unit
Conditions
Pre-regulator/Startup
+V
IN
Input Voltage
HV9110/13
120
V
I
IN
< 10
A; V
CC
> 9.4V
HV9112
80
+I
IN
Input Leakage Current
10
A
V
DD
> 9.4V
V
TH
V
DD
Pre-regulator Turn-off Threshold Voltage
8.0
8.7
9.4
V
I
PREREG
= 10
A
V
LOCK
Undervoltage Lockout
7.0
8.1
8.9
V
Supply
I
DD
Supply Current
0.75
1.0
mA
C
L
< 75pF
I
Q
Quiescent Supply Current
0.55
mA
Shutdown = -V
IN
I
BIAS
Nominal Bias Current
20
A
V
DD
Operating Range
9.0
13.5
V
Shutdown Logic
t
SD
Shutdown Delay
1
50
100
ns
C
L
= 500pF, V
SENSE
= -V
IN
t
SW
Shutdown Pulse Width
1
50
ns
t
RW
RESET Pulse Width
1
50
ns
t
LW
Latching Pulse Width
1
25
ns
Shutdown and reset low
V
IL
Input Low Voltage
2.0
V
V
IH
Input High Voltage
7.0
V
I
IH
Input Current, Input Voltage High
1.0
5.0
A
V
IN
= V
DD
I
IL
Input Current, Input Voltage Low
-25
-35
A
V
IN
= 0V
Output
V
OH
Output High Voltage
HV9110/13
V
DD
-0.25
V
I
OUT
= 10mA
HV9112
V
DD
-0.3
HV9110/13
V
DD
-0.3
I
OUT
= 10mA,
T
A
= -55
C to 125C
V
OL
Output Low Voltage
All
0.2
V
I
OUT
= -10mA
HV9110/13
0.3
I
OUT
= -10mA,
T
A
= -55
C to 125C
R
OUT
Output Resistance
Pull Up
15
25
I
OUT
=
10mA
Pull Down
8.0
20
Pull Up
20
30
I
OUT
=
10mA,
Pull Down
10
30
T
A
= -55
C to 125C
t
R
Rise Time
1
30
75
ns
C
L
= 500pF
t
F
Fall Time
1
20
75
ns
C
L
= 500pF
Note:
1. Guaranteed by design. Not subject to production test.
4
HV9110/HV9112/HV9113
Shutdown
Reset
Output
H
H
Normal Operation
H
H
L
Normal Operation, No Change
L
H
Off, Not Latched
L
L
Off, Latched
L
H
L
Off, Latched, No Change
Truth Table
Shutdown Timing Waveforms
Functional Block Diagram
V
DD
50%
0
t
d
Output
Sense
1.5V
0
t
SD
50%
90%
90%
V
DD
Output
0
Shutdown
V
DD
0
t
LW
50%
50%
t
SW
50%
50%
t
RW
Reset
0
V
DD
Shutdown
0
V
DD
50%
t
R
, t
F
10ns
t
F
10ns
t
R
10ns
Pin numbers in parentheses are for PLCC package
+
+
+
REF
GEN
+
+
Modulator
Comparator
OSC
R
S
Q
Current Limit
Comparator
9110
9112
COMP
Discharge
OSC
In
OSC
Out
FB
V
REF
BIAS
V
DD
+V
IN
Pre-regulator/Startup
8.6V
8.1V
Undervoltage
Comparator
S
R
Q
V
DD
Shutdown
Reset
-V
Current Sense
IN
Output
Error
Amplifier
4V
To
Internal
Circuits
1.2V
Current
Sources
To V
DD
2V
T
Q
9113
4 (6)
5 (8)
3 (5)
11 (16)
12 (17)
2 (3)
6 (9)
1 (20)
10 (14)
14
(19)
13
(18)
9
(12)
8 (11)
7 (10)
5
HV9110/HV9112/HV9113
PSRR -- Error Amplifier and Reference
1M
10K
100
100K
1K
10
Output Switching Frequency
vs. Oscillator Resistance
1M
100 k
10k
10k
R
OSC
(
)
f (Hz)
OUT
80
70
60
50
40
30
20
10
0
-10
100
1K
10K
Error Amplifier
Open Loop Gain/Phase
100K
1M
Gain (dB)
Phase (
C)
180
120
60
0
-60
-120
-180
Frequency (Hz)
10
6
10
5
10
4
10
3
10
2
10
1
.1
10MHz
1MHz
100Hz
1KHz
10KHz
Error Amplifier Output Impedance (Z
0
)
100KHz
0
-10
-20
-30
-40
-50
-60
-70
-80
100k
1M
HV9113
HV9110, 9111, 9112
Bias Resistance (
)
10
7
10
6
10
5
1
Bias Current (
A)
10
100
V
DD
= 10V
V
DD
= 12V
PSSR (dB)
Frequency (Hz)
Z
O
(
)
Frequency
R
DISCHARGE
vs. t
OFF
(9113 only)
R
DISCHARGE
(
)
10
3
10
-1
10
2
t
OFF
(nsec)
10
3
10
4
R
OSC
= 100K
R
OSC
= 10K
R
OSC
= 1K
10
4
10
0
10
5
10
1
10
6
10
2
Typical Performance Curves
Fig. 1
Fig. 2
Fig. 5
Fig. 3
Fig. 4
Fig. 6
6
+
Reference
V
1
V
2
0.1V swept 10Hz 1MHz
0.1
F
10.0V
4.00V
100K1%
100K1%
PSRR
Test Circuits
Detailed Description
Preregulator
The preregulator/startup circuit for the HV911X consists of a high-
voltage n-channel depletion-mode DMOS transistor driven by an
error amplifier to form a variable current path between the V
IN
terminal and the V
DD
terminal. Maximum current (about 20 mA)
occurs when V
DD
= 0, with current reducing as V
DD
rises. This path
shuts off altogether when V
DD
rises to somewhere between 7.8
and 9.4V, so that if V
DD
is held at 10 or 12V by an external source
(generally the supply the chip is controlling). No current other than
leakage is drawn through the high voltage transistor. This mini-
mizes dissipation.
An external capacitor between V
DD
and V
SS
is generally required
to store energy used by the chip in the time between shutoff of the
high voltage path and the V
DD
supply's output rising enough to
take over powering the chip. This capacitor should have a value
of 100X or more the
effective gate capacitance of the MOSFET
being driven, i.e.,
C
storage
100 x (gate charge of FET at 10V
10V)
as well as very good high frequency characteristics. Stacked
polyester or ceramic caps work well. Electrolytic capacitors are
generally not suitable.
A common resistor divider string is used to monitor V
DD
for both
the undervoltage lockout circuit and the shutoff circuit of the high
voltage FET. Setting the undervoltage sense point about 0.6V
lower on the string than the FET shutoff point guarantees that the
undervoltage lockout always releases before the FET shuts off.
Bias Circuit
An external bias resistor, connected between the bias pin and V
SS
is required by the HV911X to set currents in a series of current
mirrors used by the analog sections of the chip. Nominal external
bias current requirement is 15 to 20
A, which can be set by a
390K
to 510K resistor if a 10V V
DD
is used, or a 510k
to
680K
resistor if V
DD
will be 12V. A precision resistor is
not
required;
5% is fine.
Clock Oscillator
The clock oscillator of the HV911X consists of a ring of CMOS
inverters, timing capacitors, a capacitor discharge FET, and, in
the 50% maximum duty cycle versions, a frequency dividing flip-
flop. A single external resistor between the OSC In and OSC Out
pins is required to set oscillator frequency (see graph). For the
50% maximum duty cycle versions the Discharge pin is internally
connected to GND. For the 99% duty cycle version, the discharge
pin can either be connected to V
SS
directly or connected to V
SS
through a resistor used to set a deadtime.
One difference exists between the Supertex HV911X and com-
petitive 911X's: On the Supertex part the oscillator is shut off
when a shutoff command is received. This saves about 150
A of
quiescent current, which aids in the construction of power sup-
plies to meet CCITT specification I-430, and in other situations
where an absolute minimum of quiescent power dissipation is
required.
Reference
The Reference of the HV911X consists of a stable bandgap
reference followed by a buffer amplifier which scales the voltage
up to approximately 4.0V. The scaling resistors of the reference
buffer amplifier are trimmed during manufacture so that the output
of the error amplifier when connected in a gain of 1 configuration
is as close to 4.000V as possible. This nulls out any input offset
of the error amplifier. As a consequence, even though the ob-
served reference voltage of a specific part may not be exactly
4.0V, the feedback voltage required for proper regulation will be.
A
50K resistor is placed internally between the output of the
reference buffer amplifier and the circuitry it feeds (reference
output pin and non-inverting input to the error amplifier). This
allows overriding the internal reference with a low-impedance
voltage source
6.0V. Using an external reference reinstates the
input offset voltage of the error amplifier, and its effect of the exact
value of feedback voltage required.
Because the reference of the 911X is a high impedance node, and
usually there will be significant electrical noise near it, a bypass
capacitor between the reference pin and V
SS
is strongly recom-
mended. The reference buffer amplifier is intentionally compen-
sated to be stable with a capacitive load of 0.01 to 0.1
F.
+
Reference
V
1
V
2
60.4K
40.2K
1.0V swept 100Hz 2.2MHz
Tektronix
P6021
(1 turn
secondary)
0.1
F
+10V
(V
DD
)
GND
(V
IN
)
(FB)
NOTE: Set Feedback Voltage so that
V
COMP
= V
DIVIDE
1mV before connecting transformer
Error Amp Z
OUT
HV9110/HV9112/HV9113
7
1
7
6
5
4
3
2
14
13
12
11
10
9
8
Error Amplifier
The error amplifier in the HV911X is a true low-power differential
input operational amplifier intended for around-the-amplifier com-
pensation. It is of mixed CMOS-bipolar construction: A PMOS
input stage is used so the common-mode range includes ground
and the input impedance is very high. This is followed by bipolar
gain stages which provide high gain without the electrical noise of
all-MOS amplifiers. The amplifier is unity-gain stable.
Current Sense Comparators
The HV911X uses a true dual comparator system with indepen-
dent comparators for modulation and current limiting. This allows
the designer greater latitude in compensation design, as there are
no clamps (except ESD protection) on the compensation pin. Like
the error amplifier, the comparators are of low-noise BiCMOS
construction.
Remote Shutdown
The shutdown and reset pins of the 911X can be used to perform
either latching or non-latching shutdown of a converter as re-
quired. These pins have internal current source pull-ups so they
can be driven from open-drain logic. When not used they should
be left open, or connected to V
DD
.
Output Buffer
The output buffer of the HV911X is of standard CMOS construc-
tion (P-channel pull-up, N-channel pull-down). Thus the body-
drain diodes of the output stage can be used for spike clipping if
necessary, and external Schottky diode clamping of the output is
not required.
Detailed Description
(continued)
Pinout
14 Pin SOIC/DIP Package
FB
COMP
Reset
Shutdown
V
REF
Discharge
OSC In
BIAS
+V
IN
Sense
Output
V
IN
V
DD
OSC Out
FB
BIAS
NC
NC
+V
IN
19
20
1
2
3
18
17
16
15
14
13
12
11
10
9
4
5
6
7
8
NC
Discharge
OSC In
OSC Out
V
DD
NC
Sense
Output
NC
V
IN
20-pin PJ Package
top view
COMP
Reset
Shutdown
NC
V
REF
HV9110/HV9112/HV9113
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 FAX: (408) 222-4895
www.supertex.com
11/12/01
2001 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
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