RT9206GS | |
|---|---|
| Manufacturer Part Number | RT9206GS |
| Description | IC CTRLR DUAL SYNC BUCK 16SOP |
| Manufacturer | Richtek USA Inc |
| RT9206GS datasheets |
|
Availability: In stock
International delivery:
Warranty: 60 days
×
- We provide standard 60-days warranty for all parts. If warranty differs we always mention it beforehand. In case of return we cover shipping costs.
- If you still have any questions - please contact us
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- If you still have any questions - please contact us
Specifications of RT9206GS | |||
|---|---|---|---|
| Topology | Step-Down (Buck) Synchronous (1), Linear (LDO) (2) | Function | Any Function |
| Number Of Outputs | 3 | Frequency - Switching | 200kHz ~ 600kHz |
| Voltage/current - Output 1 | Controller | Voltage/current - Output 2 | Controller |
| Voltage/current - Output 3 | Controller | W/led Driver | No |
| W/supervisor | No | W/sequencer | No |
| Voltage - Supply | 4.75 V ~ 28 V | Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount | Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Lead Free Status / RoHS Status | Lead free / RoHS Compliant | ||
PrevNext
RT9206
T
VR
T
SS
T
PGOOD
Figure 4. The soft-stat timing diagram of RT9206
For the example of C
= 1μF, V
SS
T
= 57ms, T
= 133ms and T
VR
SS
Shutdown
The power stage can be shutdown by pulling soft-start pin
below 0.7V. During shutdown, both of high side MOSFET
(S1) and low side MOSFET (S2) are turned off.
Setting the switching frequency
The switching frequency can be set by a resistor (R
connecting between RT and GND pins. Equation (16)
describes the relationship of R
RT
As R
open the normally operated frequency is 200kHz.
T
8
×
62 10
R
=
RT
(Ω)
3
×
f - 200 10
S
R
Connecting Between
RT
RT and GND Pins
f
(kHz)
S
250
300
350
400
450
500
550
600
www.richtek.com
16
V
Boost Component Selection
DD
V
SS
The booststrap gate drive circuit is used to drive high side
N-channel MOSFET. The boost capacitor should be a good
quality and can operate in high frequency. The value of
boost capacitor depends on the total gate charge (Q
V
OUT
turn on the MOSFETs. Assuming steady state operation,
the following equation can be used to calculate the
PGOOD
capacitance value to achieve the targeted ripple voltage
Δ V
The capacitor in the range of 0.1μF to 1μF is generally
adequate for most applications.
= 12V, V
= 5V, then
The VINT pin bypass capacitor C
IN
OUT
= 640ms.
boost capacitor, to drive the low side MOSFET, and to power
PGOOD
the RT9206. C
with short and wide traces. Generally, a 4.7μF high
frequency ceramic capacitor is recommended.
Feedback Compensation
The RT9206 is a voltage mode controller. The control loop
is a single voltage feedback loop including a trans-
)
conductance error amplifier and a PWM comparator.
RT
To achieve fast transient response and accurate output
and switching frequency.
regulation, appropriate feedback compensation is
necessary. The goal of the compensation network is to
provide a closed loop transfer function with the highest
0dB crossing frequency and adequate phase margin.
(16)
Generally, the phase margin in a range of 45° to 60° is
desirable. Figure 4 shows the simplified diagram of
synchronous buck converter and control loop.
R
(kΩ)
RT
120
55
37.5
30.6
24.4
22.5
19.3
16.8
.
BOOT
Q
Hg
C
=
BOOT
ΔV
BOOT
INT
should locate near VINT and GND pins
INT
g) to
H
(F)
needs to charge the
DS9206-12 April 2008
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