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| 型号： | IR3629AMTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 8/23页 |
| 文件大小： | 0K |
| 描述： | IC CTLR PWM SYNC BUCK 12-MLPD |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 应用： | 控制器，DDR |
| 输入电压： | 4.5 V ~ 14 V |
| 输出数： | 1 |
| 输出电压： | 可调至 0.6V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘 |
| 供应商设备封装： | 12-MLPD |
| 包装： | 标准包装 |
| 产品目录页面： | 1383 (CN2011-ZH PDF) |
| 其它名称： | IR3629AMTRPBFDKR |
IR3629/IR3629A MPbF
Circuit Description
THEORY OF OPEARTION
Introduction
The IR3629/29A is a voltage mode PWM
synchronous controller and operates with a fixed
600kHz (300kHz for IR3629A) switching
frequency, allowing the use of small external
components. The output voltage is set by a
feedback pin (Fb) and the internal reference
voltage (0.6V). These are the two inputs to the
error amplifier. The error signal between these
two inputs is amplified and it is compared to a
fixed frequency linear sawtooth ramp and
generates fixed frequency pulses of variable
duty-cycle (D) which drivers N-channel external
MOSFETs.
The internal oscillator circuit uses an on-chip
capacitor to set the switching frequency.
The IR3629/29A operates with single input
voltage from 4.5V to 12V allowing an extended
operating input voltage range.
The current limit is programmable and uses on-
resistance of the low-side MOSFET, eliminating
the need for an external current sense resistor .
Under-Voltage Lockout
The under-voltage lockout circuit monitors the
two input supplies (Vcc and Vc) and ensures that
the MOSFET driver outputs remain in the off
state whenever the supply voltage drops below
set thresholds. Lockout occurs if Vc or Vcc fall
below 3.3V and 4.2V respectively. Normal
Power Good
The IR3629/29A provides an open collector
power good signal which reports the status of the
output. The output is sensed through the
dedicated Vsns pin. The power good threshold
can be externally programmed using two external
resistors. The power good comparator is
internally set to 0.38V (typical).
Shutdown
The output can be shutdown by pulling the soft-
start pin below 0.3V. This can easily be done by
using an external small signal transistor. During
shutdown both MOSFET drivers will be turned
off. Normal operation will resume by cycling the
soft start pin.
Pre-Bias Startup
The IR3629/29A is able to start up into pre-
charged output, which prevents oscillation and
disturbances of the output voltage.
The output starts in asynchronous fashion and
keeps the synchronous MOSFET off until the first
gate signal for control MOSFET is generated.
Figure 4 shows a typical Pre-Bias condition at
startup.
Depending on the system configuration, specific
amount of output capacitors may be required to
prevent discharging the output voltage.
operation resumes once Vc and Vcc rise above
the set values.
Thermal Shutdown
Temperature sensing is provided inside the
IR3629/29A. The trip threshold is typically set to
145 o C. When the trip threshold is exceeded,
thermal shutdown discharges the Soft Start
voltage and turns off both MOSFETs. Thermal
shutdown is not latched and automatic restart is
initiated when the sensed temperature drops
Volt
Pre-Bias Voltage
(Output Voltage before startup)
Fig. 4: Pre-Bias startup
Vo
Time
within the operating range. There is a 20 o C
hysteresis in the thermal shutdown threshold.
Minimum Pulse Width
The time required for turning on and off the high
side MOSFET is defined as “Minimum Pulse
Width”. To ensure that a reliable operation is
achieved the following condition needs to be met:
11/29/2007
T on (min) <
V out
V in (max) * F s
8
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| IR3629MPBF | 功能描述:IC CTLR PWM BUCK SYNC 12-MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IR3629MTRPBF | 功能描述:电压模式 PWM 控制器 HI FREQ SYNC PWM 600kHz 5 or 12V 0.6 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| IR3637ASPBF | 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| IR3637ASTRPBF | 功能描述:开关变换器、稳压器与控制器 High Volt Sych PWM 600kHz 5V PWM RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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