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參數(shù)資料
| 型號(hào)： | RT9205PS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| 中文描述： | 雙穩(wěn)壓器-同步降壓PWM型DC - DC和線性控制器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 227K |
| 代理商： | RT9205PS |
RT9205/A
Preliminary
10
DS9205/A-08 March 2007
www.richtek.com
Application Information
The RT9205/A operates at either single 5V power supply
with a bootstrap UGATE driver or a 5V/12V dual-power
supply form the ATX SMPS. The dual- power supply is
recommended for high current applications, the RT9205/
A can deliver higher gate driving current while operating
with ATX SMPS based on a dual-power supply.
The Bootstrap Operation
In a single power supply system, the UGATE driver of
RT9205/A is powered by an external bootstrap circuit, as
shown in the Figure 3. The boot capacitor, C
BOOT
,
generates a floating reference at the PHASE pin. Typically
a 0.1
μ
F C
BOOT
is enough for most of MOSFETs used
with the RT9205/A. The voltage drop between BOOT and
PHASE is refreshed to a voltage of VCC
diode drop
(V
D
) while the lower MOSFET turning on.
Figure 3. Single 5V power Supply Operation
Dual Power Operation
The RT9205/A was designed to supply a regulated 6.0V
at VCC pin automatically when BOOT pin is powered by
a 12V. In a system with ATX 5V/12V power supply, the
RT9205/A is ideal for higher current applications due to
the higher gate driving capability, V
UGATE
= 12V and
V
LGATE
= 6.0V. A RC (10
/1
μ
F) filter is also recommended
at BOOT pin to prevent the ringing induced from fast
power-on, as shown in Figure 4.
Figure 4. Dual Power Supply Operation
Power On Reset
The Power-On Reset (POR) monitors the supply voltage
(normal +5V) at the VCC pin and the input voltage at the
OCSET pin. The VCC POR level is set to 4.1V with 0.5V
hysteresis and the normal level at OCSET pin is set to
1.5V (see over-current protection). The POR function
initiates soft-start operation after all supply voltages
exceed their POR thresholds.
Soft Start
A built-in soft-start is used to prevent surge current from
power supply input during powering on. The soft-start
voltage is controlled by an internal digital counter. It slows
down and clamps the ramping of reference voltage at the
input of error amplifier and the pulse-width of the output
driver. The typical soft-start duration is 2.5ms.
Under Voltage and Over Voltage Protection
The voltage presents at FB pin is monitored and protected
against OC (over current), UV (under voltage), and OV
(over voltage). The UV threshold is 0.56V and
OV-threshold is 1.0V. Both UV and OV detection are with
30
μ
s delay after triggered. When OC or UV trigged, a
hiccup re-start sequence will be initialized, as shown in
Figure 5. For RT9205, only 3 times of trigger are allowed
before latching off. But for RT9205A, UVP will be kept in
hiccup mode. Hiccup is disabled during soft-start interval.
+
5V
VCC
LGATE
PHASE
UGATE
BOOT
R1
VCC
C2
1uF
RT9205/A
0.1uF
D1
+
5V
VCC
LGATE
UGATE
BOOT
R
C2
1uF
RT9205/A
1uF
6.0V
Regulation
10
C
12V
VCC
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