HV9608 Supertex, Inc., HV9608 Datasheet

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HV9608

Manufacturer Part Number
HV9608
Description
Active Clamp Current-mode Pwm Controller
Manufacturer
Supertex, Inc.
Datasheet
Supertex, Inc.
Features
Applications
Typical Application Circuit
VIN
C
IN
Peak current-mode PWM Controller
Two complementary MOSFET drivers
Programmable deadtime between drivers
High current gate drivers for main and auxiliary outputs
Internal high voltage (12V to 250V) start-up regulator
Programmable V
V
Fixed frequency PWM operation from 25KHz to 800KHz
>50% duty cycle operation (up to 95%)
Programmable slope compensation
Programmable max duty-cycle/volt-second clamp
Capacitor programmable soft-start
Cycle-by-cycle current limiting
100ns current sense leading edge blanking
2 MHz error amplifier
Networking
Telecommunication Systems and Terminals
IEEE 802.3af PoE PD Devices
SANS, Servers & Workstations
High Efficiency Instrumentation Supplies
High Efficiency Supplies for Portable Equipment
DD
supply operation from 7.8V to 12V
R
VS
• 1235 Bordeaux Drive, Sunnyvale, CA 94089 • Tel: (408) 222-8888 • FAX: (408) 222-4895 • www.supertex.com
R2
IN
Active Clamp Current-Mode PWM Controller
R
C
C1
R
SC1
undervoltage lockout and hysteresis
SS
T
R1
1
2
3
4
5
6
7
8
UVLO
COMP
VIN
SS
RT
VS
REF
SC
C
Z
HV9608
C
P
AGATE
GATE
R
GND
P
VDD
DT1
DT2
CS
FB
16
15
14
13
12
11
10
9
R
R
R
DT2
SC2
DT1
C
2
VDD
Description
The HV9608 provides a single chip, optimized peak current
mode control solution for design of high performance PWM
converters using the active-clamp transformer flux reset.
Due to its programmable slope compensation feature, the
HV9608 allows operation beyond 50% duty cycle. Zero-
voltage switching can be accomplished through using the
programmable deadtime timers. The switching frequency
can be programmed from 25kHz to 800kHz using a single
resistor. The internal high voltage startup circuit can ensure
start-up from the input voltage from 12V to 250V. It can also
maintain the HV9608 in operation when the external
“bootstrap” power supply is not available. The startup
regulator is disconnected as soon as the HV9608 becomes
powered from the bootstrap winding. The HV9608 offers a
programmable soft start feature using a single external
capacitor. The cycle by cycle current limit feature can
protect the converter from overheating and damage by
limiting the output over current. The HV9608 will maintain
the cycle-by-cycle current limiting mode for a period of time
programmed by the soft start capacitor value. The HV9608
includes a single pin UVLO circuit that allows independent
accurate setting of both the turn-on and the turn-off
threshold voltage. A programmable volt-second clamp
reduces voltage stress of the switching devices. The
HV9608 is available in a space-saving TSSOP-16 package.
Q
1
R
S
T
1
C
4
C
3
Q
3
Q
4
Q
2
L
F
C
F
HV9608
R
R
4
3
-
+
Vo

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HV9608 Summary of contents

Page 1

... The cycle by cycle current limit feature can protect the converter from overheating and damage by limiting the output over current. The HV9608 will maintain the cycle-by-cycle current limiting mode for a period of time programmed by the soft start capacitor value. The HV9608 ...

Page 2

... Min Typ Max 400 80 105 130 100 400 2 HV9608 -0.3V to +250V IN +13.5V max DD -40°C to +85°C -40°C to +125°C -65° to +150°C 1000mW These are stress ratings only, and Units Conditions 24V 9. [12V – 250V] ...

Page 3

... Min Typ Max 25 200 1.112 1.135 1.158 3.3 3.45 3.6 Min Typ Max 0.1 5.25 5.45 5. HV9608 ° VDD = 10V, unless otherwise noted) A Units Conditions KHz R = 1.862MΩ T KHz R = 52.3KΩ T KHz * R = 169KΩ 169KΩ, 7.8V < Units Conditions % * f = 100KHz (R = 453KΩ ...

Page 4

... DC input voltages in the range of 12V to 250V, and supplies a regulated voltage of 9.5V to the V pin. DD UVLO – This pin can be used for enabling/disabling the HV9608 under voltage lockout input. Both the turn-on and the turn-off thresholds are independently programmable. By selecting appropriate resistor values, a corresponding voltage divider is connected to this pin ...

Page 5

... Alternatively, the high voltage regulator can continuously supply bias current up to 20mA powering the gate driver and all internal circuits of HV9608. The need for a bootstrap power supply would be eliminated in this case. However, caution must be taken to maintain the HV9608 within its package power dissipation limits. ...

Page 6

... This condition may cause saturation of the power transformer or excessive voltage stress at the clamp capacitor C order to prevent this condition, the HV9608 includes a volt-second clamp circuit that can be programmed to limit the maximum duty cycle of the PWM controller, which is inversely proportional to the ...

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