Page 1
HV9901
HV9901
Demo Kit
Available
Universal Relay Driver
Features
❐ 8V to 450V Input Voltage Range
❐ Energy Saving Hold Current Mode
❐ Adjustable Microcontroller Supply
❐ Low Supply Current <1mA
❐ Constant Current Coil Drive
❐ Programmable Pull-in Current, Pull-in Time, and Hold
Current
❐ Efficient PWM Operation Using the Relay Coils’ Inductance
Applications
❏ Industrial Controls
❏ Relay Timers
❏ White Goods
❏ Solenoid Drivers
❐ Home Automation
Preliminary
General Description
The Supertex HV9901 is a BiCMOS/DMOS universal relay
driver that employs PWM switching techniques. It is designed for
efficient and energy-saving operation of a low voltage relay with
supply voltages ranging from 8 to 450V DC through utilization of
the relay coils’ inductance.
The circuit is capable of operating over a wide input voltage
range without requiring a change of any external components.
For example, this will enable users to use 5V coil relays for DC
voltages 8 - 450V or AC voltages up to 240V.
The HV9901 has an internal high-voltage regulator to power
internal PWM circuitry. Additionally it includes an adjustable
auxiliary regulator with a 1mA capability that can be used to
supply low power microcontrollers.
The pull-in current, pull-in time and hold current are all programmable using only two resistors and a capacitor. The PWM
switching frequency can be either
– Synchronized to an external clock, or
– Synchronized to other HV9901s, where the synchronized
frequency is the highest free-running frequency
The enable (ENI) logic input is used to turn the relay on/off.
Enable polarity may be selected via the POL input. Audible noise
is prevented using fixed switching frequencies above 20kHz.
WARNING!!!
present when connected to the AC line. It is the responsibility of the designer
to ensure adequate safeguards are in place to protect the end user from
electrical shock.
Galvanic isolation is not provided. Dangerous voltages are
Typical Application Circuit
V
IN
VIN
VDD
VREF
H/D
V
CC
06/25/02
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.
VCC
Int
Reg
V
REF
Aux
Reg
HV9901
PWM
1
SYNC
GT
CS
RT
POL
ENI
ENOFB
SYNC
Enable polarity
Enable
Page 2
HV9901
Ordering Information
Pin Configuration
Package Options
16 Lead 16 Lead
Plastic DIP Plastic SO
HV9901P HV9901NG
Absolute Maximum Ratings
Input voltage, V
Input voltage to any other pin
Continuous total power dissipation for DIP 1000 mW
Continuous total power dissipation for SO 750 mW
Operating Temperature Range -40 to +85°C
Note 1: For operation above 25°C ambient derate linearly at 7.5 mW/°C.
Note 2: All voltages are referenced to COM.
2
IN
2
-0.5 to +470V
-0.3V to VDD+0.3V
V
IN
GT
HV9901
CS
COM
1
1
SYNC
RT
Top View
Plastic DIP – Plastic SO
For SO-16 Pins 2 and 3 are removed
V
DD
V
REF
HOLD/DELAY
FB
V
CC
ENI
ENO
POL
Electrical Characteristics
(TA = 25°C, unless otherwise specified)
Symbol Parameters Min Typ Max Unit Conditions
High Voltage Regulator
V
I
IN
V
V
IN
DD
UVLO
Input Voltage
Supply Current 2.0 mA no load at V
Regulator Output Voltage 7.0 7.5 7.8 V no load at V
VDD Under Voltage Lockout 6.4 6.7 7.0 V
8.0 450 V ICC = 0.25mA load
10 450 V I
Adjustable Regulator
V
CC
I
CC
V
FB
I
FB
Note: Maximum allowable load current limited by power dissipation and operating ambient temperature.
Reference (T
V
REF
V
REF
V
REF
V
REF
I
REF(SHORT)
I
REF(SINK)
Regulator Output Voltage Range 2.0 5.5 V ICC =1.0mA load
Regulator Output Current 0 1.0 mA no load at VDD , See Note
Feed Back Voltage 0 V
REF
Input Bias Current 25 100 nA VFB = V
=25°C unless otherwise noted)
A
Bandgap Reference Voltage 1.22 1.25 1.28 V TA = 25°C
Bandgap Reference Voltage 1.20 1.25 1.30 V TA = -40°C to +85°C
Load Regulation 7.0 mV 0mA < I
Line Regulation 2.0 5.0 mV 6V < VDD < 8V
Short Circuit Current 1.0 mA
Reference Voltage Sink Current 20 µA
V
-1.0V V
DD
= 1.0mA load
CC
DD,
load at ICC =1mA,
CGT = 500pF, f
OSC
load at
DD,
= 25 KHz
ICC =1mA, CGT = 500pF,
f
= 25 KHz
OSC
REF
< 0.3mA
REF
2
Page 3
Electrical Characteristics
(TA = 25°C, unless otherwise specified)
Symbol Parameters Min Typ Max Unit Conditions
Oscillator
HV9901
f
OSC
PWM Oscillator Frequency
20 25 35 kHz R
80 100 140 kHz RT = 226KΩ
Temperature Coefficient 170 ppm/°CTA= -40°C to +85°C
f
SYNC
Oscillator Sync Frequency 150 kHz
SYNC Sync. Input/Output Sourcing Current 20 55 µA
SYNC Sync. Input/Output Sinking Current 1.0 mA V
V
SYNC
Sync Input Logic Low Voltage 1.0 V
PWM
D
MAX
D
MAX
P
MIN
Maximum Duty Cycle 96.5 99.5 % RT = 1.00MΩ
Maximum Duty Cycle 86.5 97.5 % RT = 225KΩ
Minimum Output Pulse Width 100 200 nsec
MOSFET Driver Output
V
GTH
V
GTL
t
R
t
F
Gate Drive Output High V
– 0.3 V I
DD
Gate Drive Output Low 0.3 V I
Rise Time 30 50 nsec CGT = 500pF
Fall Time 30 50 nsec CGT = 500pF
= 1.00MΩ
T
= 0.1V
SYNC
= 10 mA
OUT
= -10 mA
OUT
Current Sensing
V
CS(HL)
t
DELAY(HL)
I
CS
V
OS
t
DELAY(LL)
V
HOLD/DEL
I
HOLD/DEL
Current Sense Voltage, high limit 0.775 0.833 0.891 V
Current limit delay to GT high limit 200 250 ns VCS = 0.88 Volts
Input Bias Current 25 1000 nA POL=LOW, ENI=LOW
Low limit comparator input offset voltage ±60 mV
Current limit delay to GT, low limit 200 250 ns VCS=0.47V, V
Hold/Delay output voltage V
Hold Delay Input Bias Current 25 500 nA POL=LOW, ENI=LOW
-0.4 V I
DD
=0.417V
HOLD
HOLD/DEL
(Sourcing)-100µA,
POL=LOW, ENI=HIGH
3
Page 4
Electrical Characteristics, continued
(TA = 25°C, unless otherwise specified)
Symbol Parameters Min Typ Max Unit Conditions
Enable Logic
HV9901
t
V
V
I
I
V
V
I
I
V
V
ENI
ENI
ENI
ENI
ENI
POL
POL
POL
POL
ENO
ENO
Shutdown Delay 50 100 nsec 2V < VCC < 5.5V
Enable Input Voltage - High 0.7V
CC
V
CC
Enable Input Voltage - Low 0 0.3V
Enable Input Current - High 1.0 5.0 µA 2V < VCC < 5.5V
Enable Input Current - Low -5.0 -1.0 µA 2V < VCC < 5.5V
Polarity Voltage - High 0.7V
CC
V
CC
Polarity Voltage - Low 0 0.3V
Polarity Current - High 1.0 5.0 µA 2V < VCC < 5.5V
Polarity Current - Low -5.0 -1.0 µA 2V < VCC < 5.5V
Enable Output Voltage - High 0.9V
CC
V
CC
Enable Output Voltage - Low 0 0.1V
Enable Logic Truth Table
POL ENI ENO Gate Drive Output
LOW LOW HIGH VGT = Oscillating Output, Duty Cycle depends on Inductive Load
LOW HIGH LOW VGT = LOW, SYNC = HIGH, Oscillator shut down.
HIGH HIGH LOW VGT = Oscillating Output, Duty Cycle depends on Inductive Load
HIGH LOW HIGH V
= LOW, SYNC = HIGH, Oscillator shut down.
GT
CC
CC
CC
V 2V < VCC < 5.5V
V 2V < VCC < 5.5V
V 2V < VCC < 5.5V
V 2V < VCC < 5.5V
V 2V < VCC < 5.5V
V 2V < VCC < 5.5V
4
Page 5
Applications Information
V
CS HL
I
−
PULL IN
V
CS LL
()
=
I
HOLD
tRRC
−
PULL IN HDa HDb HD
≈ +
f
PWM
()
==
R
SENSE
V
DD
=
R
HD
9
+
1
R
HD
6
V
CS LL
()
R
SENSE
= −
(
3.23kHz
21.8GHz
R
OSC
V
CS HI
V
DD
)
Ω
⋅
833mVnom
()
7.5Vnom
=
VV
−
ln
1
VV
(valid for f >23kHz)
−
CS HL DD
()
−
CS LL DD
()
pwm
HV9901
t
PULL-IN
Current
I
PULL-IN
I
HOLD
Time
CC
=+
1.25V
V
1
RR
FBb
V
IN
C
IN
R
FBa
VIN
R
R
HDa
HDb
C
C
C
DD
REF
HD
VDD
VREF
H/D
Int
Reg
V
REF
HV9901
PWM
SYNC
GT
CS
RT
R
OSC
Q
SW
R
SENSE
2.0–5.5V
@ 1mA
R
R
FBa
FBb
VCC
Aux
Reg
5
POL
ENI
ENOFB
Page 6
Functional Block Diagram and Typical Application
Notes: 1. This diode and bridge rectifier required only for AC operation.
2. For non-isolated AC operation the entire circuit must be floating.
3. All comparators have open drain outputs.
1N4148
100nF
1N4937
See Note 1.
LED
RELAY
10K
VIN
1
UVLO
C
A
R
2R
Bandgap
Reference
1.25 V
HOLD/DELAY
VDD
VREF
16
15
14
4.7µF
100nF
CHD
HV9901
R
HDa
R
HDb
VN2460N8
RS
VDD
GT
4
100ns
Delay
CS
5.5kΩ
5
C
Low Limit
High Limit
C
S
Q
R
R
1.25V
VDD
COM
6
VDD
40µA
SYNC
7
Oscillator
shut down
High Duty
Cycle
Oscillator
VDD
FB
VCC
ENI
ENO
13
12
11
10
R
R
100nF
5 V
µP
FBb
FBa
Rosc
©2002 Supertex Inc. All rights reserved. Unauthorized use or reproduction prohibited.
RT
8 9
POL
06/26/02rev.4
1235 Bordeaux Drive, Sunnyvale, CA 94089
TEL: (408) 744-0100 • FAX: (408) 222-4895
6
www.supertex.com
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