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参数资料
| 型号： | XC9243B08DDR-G |
| 厂商： | Torex Semiconductor Ltd |
| 文件页数： | 8/29页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A USP-10B |
| 标准包装： | 3,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.9 V ~ 6 V |
| 输入电压： | 2.7 V ~ 6 V |
| 频率 - 开关： | 2.4MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-UFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | USP-10B |
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XC9242/XC9243 Series
■ OPERATIONAL DESCRIPTION
The XC9242/XC9243 series consists of a reference voltage source, ramp wave circuit, error amplifier, PWM comparator, phase
compensation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel MOS switching transistor for the
synchronous switch, current limiter circuit, UVLO circuit and others.
(See the block diagram above.) The series ICs compare, using the error
amplifier, the voltage of the internal voltage reference source with the feedback voltage from the FB pin.
Phase compensation is performed on
the resulting error amplifier output, to input a signal to the PWM comparator to determine the turn-on time during PWM operation.
The PWM
comparator compares, in terms of voltage level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers
the resulting output to the buffer driver circuit to cause the Lx pin to output a switching duty cycle.
This process is continuously performed to
ensure stable output voltage.
The current feedback circuit monitors the P-channel MOS driver transistor current for each switching operation,
and modulates the error amplifier output signal to provide multiple feedback signals.
This enables a stable feedback loop even when a low
ESR capacitor such as a ceramic capacitor is used ensuring stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 1.2MHz or 2.4MHz.
Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and to synchronize all the internal
circuits.
<Error Amplifier>
The error amplifier is designed to monitor output voltage.
The amplifier compares the reference voltage with the feedback voltage divided by
the external split resistors, R1 and R2.
When a voltage lower than the reference voltage is fed back, the output voltage of the error amplifier
increases.
The gain and frequency characteristics of the error amplifier output are fixed internally to deliver an optimized signal to the mixer.
<Current Limit>
The XC9242/XC0243 series includes a fold-back circuit, which aids the operation of the current limiter and circuit protection. The
XC9242/XC9243 series monitors the current flowing through the P-channel MOS driver transistor
① When current flowing through P-channel MOS driver transistor reaches current limit I LIM , the current limiter circuit operates to limit the
inductor current I LX .
damage.
If this state continues, the fold-back circuit operates and limit the output current in order to protect the IC from
② The output voltage is automatically resumed if the load goes light.
8/29
When it is resumed, the soft-start function operates.
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相关代理商/技术参数 |
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| XC9243B08DQR-G | 制造商:Torex Semiconductor LTD 功能描述: |
| XC9246B65CMR-G | 制造商:Torex Semiconductor LTD 功能描述:IC REG BUCK ADJ 1A SOT-26W |
| XC9246B65CMR-G-EVB | 制造商:Torex Semiconductor LTD 功能描述:BOARD EVAL FOR XC9246B65 |
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| XC9246B75CMR-G-EVB | 制造商:Torex Semiconductor LTD 功能描述:BOARD EVAL FOR XC9246B75 |
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