rt9600 ETC-unknow, rt9600 Datasheet - Page 4

• Manufacturer Part Number: rt9600
• Description: Synchronous-rectified Buck Mosfet Drivers
• Manufacturer: ETC-unknow

RT9600
Operation Descriptions
The RT9600 is designed to drive both high side and
low side N-channel MOSFET through externally input
PWM control signal. It has power on protection
function which held UGATE and LGATE low before
V
initialization, the PWM signal takes the control. The
rising PWM signal first forces the LGATE signal turns
low then UGATE signal is allowed to go high just after
a non-overlapping time to avoid shoot-through
current. The falling of PWM signal first forces UGATE
to go low. When UGATE and PHASE signal reach a
predetermined low level, LGATE signal is allowed to
turn high. The non-overlapping function is also
presented between UG and LG signal transient.
The PWM signal is recognized as high if above rising
threshold and as low if below falling threshold. Any
signal level in this window is considered as tri-state,
which causes turn-off of both high side and low-side
MOSFET.
connected), internal divider will pull the PWM to 1.9V
to give the controller a recognizable level. The
maximum sink/source capability of internal PWM
reference is 60µA.
The PVCC pin provides flexibility of high side
MOSFET gate drive voltage. If 8V, for example, is
applied to PVCC, then high side MOSFET gate drive
is 8V-1.5V(approximately, internal diode plus series
resistance voltage drop).
The RT9600 typically operates at frequency of
200~250KHz. A 1N4148 diode connecting PVCC and
BOOT
frequency.
www.richtek.com
4
LGATE Rise Time
UGATE Fall Time
LGATE Fall Time
UGATE Turn-Off Propagation Delay
LGATE Turn-Off Propagation Delay
Shutdown Window
CC
up across the rising threshold voltage. After the
is
When
recommended
Parameter
PWM
input
for
higher
is
Symbol
floating
operating
V
V
V
V
V
(not
Preliminary
PVCC
PVCC
PVCC
VCC
VCC
= V
= V
= V
= V
= V
Test Conditions
PVCC
PVCC
VCC
VCC
VCC
Testing Conditions
The C
side and low side low capacitors. The 20Ω resistor
between PHASE and ground is implemented as the
load of the buck converter.
For
measurements are made to calculate the R
should be noted that source of both high side and low
side drivers are both current controlled current
sources, the output resistance is acquired by
interpolation.
= 12V, 3nF load
= 12V, 3nF load
= 12V, 3nF load
= 12V, 3nF load
= 12V, 3nF load
+12V
0.1µF
U
output
PWM
+12V
and C
0.1µF
L
resistance,
capacitors in the test circuit are high
PWM
PVCC
VCC
Testing Circuit
RT9600
BOOT
GND
Min
1.1
+12V
--
--
--
--
--
UGATE
PHASE
LGATE
typical
DS9600-00 August, 2002
Typ
0.1µF
30
40
30
60
45
--
C
3nF
L
2N7002
Max
voltage/current
3.7
--
--
--
--
--
DS(ON).
2N7002
Units
ns
ns
ns
ns
ns
V
20Ω
C
3nF
It
U