HV9606 Supertex, Inc., HV9606 Datasheet - Page 4

• Manufacturer Part Number: HV9606
• Description: Switchmode PWM Controller
• Manufacturer: Supertex, Inc.

Absolute Maximum Ratings*
Pinout
Pin Description
V
circuits. When the input voltage to the V
voltage the input regulator seeks to regulate the voltage on the
capacitor connected to this pin to a nominal 2.9V. After the PWM
has started, the bootstrap supply will regulate this voltage to a
nominal 3.3V or 5V. With V
be powered via this pin in the voltage range of 2.9V to 5.5V with
a nominal 2.8V UVLO.
START – The resistive divider from V
start voltage.
STOP – The resistive divider from V
stop voltage. A low power sleep mode function may be imple-
mented by pulling this pin to SGND.
V
input voltages in the range of 15V to 250V. With START and
STOP programmed to more than 20V, the leakage current on this
pin is less than 6µA at V
VREF – This pin provides a 1% tolerance reference voltage.
SS – A capacitor connected to this pin determines the soft start
time. Soft start may be initiated by a low VX2 voltage or an over
current condition when the supervisor circuit STATUS output is
low. During short duration input interruptions when the output
voltage does not decay below programmed limits, the supervisor
circuit inhibits soft start to permit rapid recovery of the system.
V
Supply Voltage, V
Gate Drive Supply Voltage, VX2
Operating Ambient Temperature Range
Storage Temperature Range
Power Dissipation @ 25∞C, SSOP
Power Dissipation @ 25∞C, Plastic DIP
* All voltages referenced to SGND and PGND pins.
DD
IN
IN
– This is the startup linear regulator input. It can accept DC
– This is the supply pin for the PWM Logic and Analog
Input Voltage
START
PGND
SGND
STOP
SYNC
VDD
REF
Vin
RT
SS
10
1
2
3
4
5
6
7
8
9
DD
IN
= 20V.
IN
connected to PGND the circuit can
20
19
18
17
16
15
14
13
12
11
STATUS
SENSE
FB
COMP
NI
CA
CB
VX2
GATE
CS
IN
IN
sets the start-up regulator
sets the start-up regulator
IN
pin exceeds the start
-65∞C to +150∞C
-40∞C to +85∞C
-0.3V to +250V
-0.3V to +6V
-0.3 to +15V
750mW
750mW
4
Ordering Information
SYNC – This I/O pin may be connected to the SYNC pin of other
HV9606 circuits and will cause the oscillators to lock to the
highest frequency oscillator. Synchronization to a master clock
is possible by means of an open collector or open drain logic gate
or optocoupler provided the low duty cycle does not exceed 50%.
If synchronization is utilized then a pull up resistor to V
required to overcome the effects of parasitic capacitance on the
circuit board. The value of the resistor required will depend on
the operating frequency and master clock duty cycle.
RT – The resistor connected from this pin to SGND sets the
frequency of the internal oscillator by setting the charging current
for the internal timing capacitor. The PWM output frequency is
one half the oscillator frequency.
SGND – Common connection for all Logic and Analog circuits.
PGND – Common connection for Gate Driver circuit.
CS – This is the current sense input. Under normal operation the
over current limit is triggered when the voltage on this pin
exceeds 0.5V
first 85ns on time of the MOSFET to prevent false triggering
during the turn on switching transition. The loop control operating
peak current sense may be set to any level below 0.5V
GATE – This push-pull CMOS output is designed to drive the
gate of an N-Channel power MOSFET.
VX2 – This is the supply pin for the Gate Driver circuit and is
generated by the Charge Pump V
should be bypassed to PGND with a capacitor, typically 0.1mF.
CA and CB – The charge pump circuit uses a capacitor (typically
0.01µF) connected between these pins to generate the VX2
voltage.
NI – High impedance non-inverting input of the error amplifier.
COMP – The output of the error amplifier.
FB – High impedance inverting input of the error amplifier.
SENSE – This is the input pin to the supervisory circuit. On a
rising input voltage the circuit changes state at a nominal
0.85V
changes state a nominal 0.85V
STATUS – This is the output of the supervisory circuit. When the
sense-input voltage is high, this output is pulled up to V
10mA current source and the Soft Start function is disabled.
When the sense-input is low, this output is pulled low and it may
be used to directly control the reset of a microprocessor or it may
be used to drive an optocoupler or LED indicator.
2
H
0
V
P
9
REF
n i
6
P
0
S
a
+ 0.075V. When the input voltage is decaying the circuit
6
c
S
S
k
O
a
P
P
REF
g
e
, however, current sensing is blanked during the
O
t p
H
o i
V
9
n
D
6
s
e i
0
6
X
REF
DD
– 0.075V.
voltage multiplier circuit. It
HV9606
REF
DD
.
DD
by a
is