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參數資料
| 型號： | RT9602 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DUAL CHANNEL SYNCHRONOUS-RECTIFIED BUCK MOSFET DRIVER |
| 中文描述： | 雙通道同步整流降壓MOSFET驅動器 |
| 文件頁數： | 5/8頁 |
| 文件大?。?/td> | 166K |
| 代理商： | RT9602 |
Preliminary
RT9602
DS9602-00 January 2002
www.richtek-ic.com.tw
5
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Output
Upper Drive Source
R
UGATE
V
VCC
= 12V, V
PVCC
= 12V
--
1.5
--
Upper Drive Sink
R
UGATE
V
VCC
= 12V, V
PVCC
= 12V
V
VCC
= 12V, V
PVCC
= 12V
--
1.45
2
Lower Drive Source
R
LGATE
--
1.6
--
Lower Drive Sink
R
LGATE
V
VCC
= V
PVCC
= 12V
--
0.75
1
Operation Descriptions
The RT9602 has power on protection function which
held UGATE and LGATE low before V
CC
up across
the rising threshold voltage. After the 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
predetermined low level, LGATE signal is allowed to
turn high. The non-overlapping function is also
presented between UGATE and LGATE signal
transient.
signal
reach
a
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. When PWM input is floating (not
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 60
μ
A.
The PVCC pin provides flexibility of both high side
and low side MOSFET gate drive voltages. 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 low side gate drive voltage is exactly 8V.
The RT9602 implements a power on over-voltage
protection function. If the PHASE voltage exceeds
1.5V at power on, the LGATE would be turn on to pull
the PHASE low until the PHASE voltage goes below
1.5V. Such function can protect the CPU from
damage by some short condition happened before
power on, which is sometimes encountered in the
M/B manufacturing line.
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