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参数资料
| 型号： | RT9204CS |
| 厂商： | Richtek Technology Corporation |
| 元件分类： | 线性稳压 |
| 英文描述： | Dual Regulator - Standard Buck PWM DC-DC and Linear Power Controller |
| 中文描述： | 双稳压器-标准降压PWM型DC - DC与线性电源控制器 |
| 文件页数： | 2/14页 |
| 文件大小： | 276K |
| 代理商： | RT9204CS |
RT9204
Preliminary
www.richtek-ic.com.tw
DS9204-00 February 2002
10
Input / Output Capacitor
High frequency/long life decoupling capacitors should
be placed as close to the power pins of the load as
physically possible. Be careful not to add inductance
to the PCB trace, as it could eliminate the
performance from utilizing these low inductance
components. Consult with the manufacturer of the
load on specific decoupling requirements.
The output capacitors are necessary for filtering
output and stabilizing the close loop (see the PWM
loop stability). For powering advanced, high-speed
processors, it is required to meet with the
requirement of fast load transient, high frequency
capacitors
with
low
ESR/ESL
capacitors
are
recommended.
Another concern is high ESR induced ripple may
trigger UV or OV protections.
Linear Regulator Driver
The linear regulator of RT9204 was designed to drive
bipolar NPN or MOSFET pass transistor. For
MOSFET pass transistor, normally DRV need to
provide minimum VOUT2+VT+gate-drive voltage to
keep VOUT2 as setting voltage. When driving
MOSFET operating at 5V power supply system, the
gate-drive will be limited at 5V. In this situation shown
in Fig. 5, low VT threshold MOSFET (VT = 1V) and
Vout2 setting below 2.5V were suggested. In VBOOT
= 12V operation condition as Fig. 6, VCC is regulated
as higher to 6V providing more gate-drive for pass
MOSFET transistor, VOUT2 can be set as
≤ 3.3V.
Fig. 5
Fig. 6
PWM Loop Stability
The RT9204 is a voltage mode buck controller
designed for 5V step-down applications. The gain of
error amplifier is fixed at 35dB for simplified design.
The output amplitude of ramp oscillator is 1.6V, the
loop gain and loop pole/zero are calculated as
follows:
DC loop gain GA = 35dB
×
LC filter pole PO =
× π ×
Error Amp pole PA = 300kHz
ESR zero ZO =
× π × ESR × C
The RT9204 Bode plot as shown Fig.7 is stable in
most of application conditions.
+
FBL
VCC
RT9204
VOUT2 ≤ 2.5V
R3
BOOT
DRV
VCC = 5V
R4
< 1K
+
FBL
VCC
RT9204
VOUT2 ≤ 3.3V
R3
BOOT
DRV
VBOOT = 12V
R4
< 1K
6V
Loop Gain
VOUT = 1.5V
VOUT = 2.5V
VOUT = 3.3V
ZO = 3.2kHz
PO = 2.9kHz
L=2H
COUT = 1500F(33m)
VOUT = 3.3V
40
30
20
10
1M
100k
10k
1k
100
Fig. 7
LC
2
1
2
1
6
.
1
5
VOUT
8
.
0
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| RT9205ACS | Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
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| RTB-1.5-3P | 3 CONTACT(S), MALE, STRAIGHT TWO PART BOARD CONNECTOR, SOLDER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| RT9204GS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9204PS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Standard Buck PWM DC-DC and Linear Controller |
| RT9205 | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205/ACS | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
| RT9205_07 | 制造商:RICHTEK 制造商全称:Richtek Technology Corporation 功能描述:Dual Regulators - Synchronous Buck PWM DC-DC and Linear Controller |
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