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零件编号 | SX1302 | ||
描述 | Asynchronous Boost Controller | ||
制造商 | Suosemi | ||
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Asynchronous Boost Controller
SX1302
General Description
The SS5X1133092isisaabobosotstotpooploolgoygyswswitcithcihnigngrergeuglualator control IC for battery-powered applications.
The SX1302 includes a totem-pole single output st age for driving NPN transistor or N-MOS, high
precision reference voltage(0.5V) to compare output voltage with feedback amplifier, an internal duty
time control for controlling the minimum duty cycle, programmable soft start with short circuit protection
function and logic level control for operating mode or standby mode.
Features
Wide Supply Voltage Operating Range: 1.8 to 15V
Precision Reference Voltage: 0.5V ±2%
Low Current Consumption: 5.5mA in Operation Mode
Low Current Consumption: 1μA in Standby Mode
High Oscillator Frequency: 1MHz max.
Totem-Pole Output with Adjustable ON / OFF Current (for NPN Transistors or n-Channel MOSFET)
Logic Level Control Stand-by Mode Function
Programmable Soft Start Function (SS)
Short Circuit Protection Function (SCP)
Package: TSSOP-8L
Applications
Digital Camera
PDA
Portable Equipment
Copyright ©2010 by Suosemi Corporation
1
SX1302
Function Description
Voltage Reference
A 1.25V regulator operating from VCC is used to power the SX1302 internal circuitry. An internal
resistive divider provides 0.5V reference for the error amplifier, Soft-start (0.9V typ.) and SCP (0.8V
typ.) circuits.
Error Amplifier
The error amplifier compares a sample of the DC-DC converter output voltage to the 0.5V
reference and generates an error signal for the PWM comparator. Output voltage of DC-DC converter
is setting with the resistor divider using the following equation (see figure12):
VOUT
1
R1
R2
0.5
VOUT
R1
1
R2
0.5V
Error Amplifier
36K
SX1302
500
8
C1
Figure 12 Error Amplifier with Feedback resistance divider
Oscillator
The oscillator frequency can be set from 20KHz to 1MHz by connecting a resistor and a
capacitor at OSC pin of SX1302 to ground. The oscillator frequency can be determined by using the
graph shown in Figure 9.
The oscillator output is a sawtooth wave with a minimum value of approximately 0.1V and a
maximum value of approximately 0.6V. The PWM comparator compares the oscillator voltage with
error amplifier output voltage, internal maximum duty control voltage (0.6V typ.) and soft start setting
voltage. When the sawtooth wave voltage is lower than all of above three-output voltage, the output of
SX1302 is high (Turn on external NPN transistor or NMOS).
Copyright ©2010 by Suosemi Corporation
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页数 | 13 页 | ||
下载 | [ SX1302.PDF 数据手册 ] |
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