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参数资料
| 型号： | TPS5110PWG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | GREEN, PLASTIC, TSSOP-24 |
| 文件页数： | 42/43页 |
| 文件大小： | 813K |
| 代理商： | TPS5110PWG4 |
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TPS5110
SLVS025B APRIL 2002 REVISED JULY 2004
8
www.ti.com
DETAILED DESCRIPTION
PWM operation
The SBRC block has a high-speed error amplifier to regulate the output voltage of the synchronous buck
converter. The output voltage of the SBRC is fed back to the inverting input (INV) of the error amplifier. The
noninverting input is internally connected to a 0.85 V precise band gap reference circuit. The unity-gain
bandwidth of the amplifier is 2.5 MHz. This decreases the amplifier delay during fast-load transients and
contributes to a fast response. Loop gain and phase compensation is programmable by an external C, R
network between the FB and INV pins. The output signal of the error amplifier is compared with a triangular wave
to achieve the PWM control signal. The oscillation frequency of this triangular wave sets the switching frequency
of the SBRC and is determined by the capacitor connected between the CT and GND pins. The PWM mode
is used for the entire load range if the PWM_SEL pin is set LOW, or used in high-output current condition if auto
PWM/SKIP mode is selected by setting the same pin to HIGH.
SKIP mode operation
The PWM_SEL pin selects either the auto PWM/SKIP mode or fixed PWM mode. If this pin is lower than 0.3 V,
the SBRC operates in the fixed PWM mode. If 2.5 V (min.) or higher is applied, it operates in auto PWM/SKIP
mode. In the auto PWM/SKIP mode, the operation changes from constant frequency PWM mode to an
energy-saving SKIP mode automatically in accordance with load conditions. Using a MOSFET with ultra-low
RDS(on) if the auto SKIP function is implemented is not recommended. The SBRC block has a hysteretic
comparator to regulate the output voltage of the synchronous buck converter during SKIP mode. The delay from
the comparator input to the driver output is typically 1.2
s. In the SKIP mode, the frequency varies with load
current and input voltage.
high-side driver
The high-side driver is designed to drive high current and low RDS(on) N-channel MOSFET(s). The current rating
of the driver is 1.2 A at source and sink. When configured as a floating driver a 5-V bias voltage is delivered from
external REG5V_IN supply. The instantaneous-drive current is supplied by the flying capacitor between the LH
and LL pins since a 5-V power supply does not usually have low impedance. It is recommended to add a 5-
to 10-
resistor between the gate of the high-side MOSFET(s) and the OUT_u pin to suppress noise. The
maximum voltage that can be applied between the LH and OUTGND pins is 33 V. When selecting the
high-current rating MOSFET(s), it is important to pay attention to both gate-drive power dissipation and the
rise/fall time against the dead-time between high-side and low-side drivers. The gate-drive power is dissipated
from the controller device and it is proportional to the gate charge at Vgs = 5 V, PWM switching frequency and
the numbers of all MOSFETs used for low-side and high-side switches. This gate drive loss should not exceed
the maximum power dissipation of the device.
low-side driver
The low-side driver is designed to drive high-current and low RDS(on) N-channel MOSFET(s). The maximum
drive voltage is 5 V from REG5V_IN pin. The current rating of the driver is typically 1.5 A at source and sink.
Gate resistance is not necessary for the low-side MOSFET for switching noise suppression since it turns on after
the parallel diode is turned on (ZVS). It needs the same dissipation consideration when using high-current rating
MOSFET(s). Another issue that needs precaution is the gate threshold voltage. Even though the OUT_d pin
is shorted to the OUTGND pin with low resistance when the low-side MOSFET(s) is OFF, high dv/dt at the LL
pin during turnon of the high side arm generates voltage peak at the OUT_d pin through the drain to gate
capacitance, Cdg, of the low-side MOSFET(s). To prevent a short period shoot-through during this switching
event, the application designer should select MOSFET(s) with adequate threshold voltage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS5110PWR | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS5110PWRG4 | 功能描述:DC/DC 开关控制器 Sync Buck w/NMOS LDO Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113 | 制造商:TI 制造商全称:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONTROLLER WITH HIGH-CURRENT GATE DRIVER |
| TPS51113DRCR | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS51113DRCT | 功能描述:DC/DC 开关控制器 4.5-13.2V Synch Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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