英飞凌ICE5GR2280AG芯片中文规格书：高效能低功耗解决方案

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"ICE5GR2280AG是英飞凌科技(INFINEON)推出的一款700V/800V固定频率的CoolSET™芯片，适用于DSO-12封装。这款芯片集成了多种高效能和保护功能，旨在优化整体系统效率并提供强大的过压保护。" 详细说明: 1. 集成700V/800V Avalanche Rugged CoolMOS™: 这款芯片的核心是其集成的高耐压Avalanche CoolMOS™功率MOSFET，设计用于处理高压环境，保证在高压工作条件下仍能保持稳定性能。 2. Enhanced Active Burst Mode (EABM): EABM是一种先进的节能模式，允许用户选择进入和退出待机状态的条件，以实现极低的待机功耗，小于100毫瓦，这显著提高了系统的能源效率。 3. 数字频率减少: 该特性允许芯片根据系统需求动态调整工作频率，以优化整体系统的能效，降低功耗。 4. 快速启动: 通过采用Cascode配置，ICE5GR2280AG能够在短时间内启动，减少了启动时间，提高了系统的响应速度。 5. 频率抖动和软门驱动: 这些特性有助于减少电磁干扰(EMI)，确保设备在运行时不会产生过多的电磁噪声，符合低EMI的设计要求。 6. 集成误差放大器: 内置的误差放大器可以提高系统的精度和稳定性，确保电源的电压控制更准确。 7. 全面的保护功能: 包括输入线过电压保护，为系统提供额外的安全保障，防止因电压过高而造成的损害。 8. Pb-free铅镀层和卤素免费模具化合物: 符合RoHS标准，意味着这款芯片不含有铅和其他有害物质，有利于环保。 9. DCM和CCM操作与斜坡补偿: 芯片支持连续导通模式(CCM)和断续导通模式(DCM)，并带有斜坡补偿功能，以确保在不同工作模式下都能稳定运行。 10. 内置数字软启动: 这一功能确保了在启动过程中电流平稳上升，避免了对电路的冲击，增强了系统的可靠性。 ICE5GR2280AG是一款高性能、高效且具有全面保护特性的开关电源解决方案，适合需要高耐压和低功耗的电源应用。

Datasheet 8 of 42 V 2.3

2020-02-03

Fixed Frequency 700 V/800 V CoolSET™ - in DSO-12 Package

Functional description

3 Functional description

3.1 V

pre-charging and typical V

voltage during start-up

As shown in Figure 1, once the line input voltage is applied, a rectified voltage appears across the capacitor C

BUS.

The pull up resistor R

STARTUP

provides a current to charge the C

iss

(input capacitance) of CoolMOS™ and gradually

generate one voltage level. If the voltage over C

iss

is high enough, CoolMOS™ on and V

capacitor will be

charged through primary inductance of transformer L

CoolMOS™ and internal diode D

with two steps

constant current source I

VCC_ Charge1

and I

VCC_ Charge3

A very small constant current source (I

VCC_Charge1

) is charged to the V

capacitor till V

reach V

CC_SCP

to protect the

controller from V

pin short to ground during the start up. After this, the second step constant current source

VCC_Charge3

) is provided to charge the V

capacitor further, until the V

voltage exceeds the turned-on threshold

VCC_ON

. As shown in the time phase I in Figure 5, the V

voltage increase almost linearly with two steps.

VCC_ON

VCC

VCC_OFF

II III

VCC_SCP

VCC_Charge2/3

VCC

VCC_Normal

VCC_Charge1

-I

VCC

Figure 5 V

voltage and current at startup

The time taking for the V

pre-charging can then be approximately calculated as:

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(1)

When the V

voltage exceeds the V

turn on threshold V

VCC_ON

at time t

, the IC begins to operate with soft-start.

Due to power consumption of the IC and the fact that there is still no energy from the auxiliary winding to

charge the V

capacitor before the output voltage is built up, the V

voltage drops (Phase II). Once the output

voltage rises close to regulation, the auxiliary winding starts to charge the V

capacitor from the time t

onward

and delivering the I

VCC_ Normal

to the CoolSET™. The V

then will reach a constant value depending on output

load.

VCC_ Charge1/2/3

is charging current from the controller to VCC capacitor during start up

VCC_ Normal

is supply current from VCC capacitor or auxiliary winding to the CoolSET™ during normal operation

Datasheet 9 of 42 V 2.3

2020-02-03

Fixed Frequency 700 V/800 V CoolSET™ - in DSO-12 Package

Functional description

3.2 Soft-start

As shown in Figure 6, the IC begins to operate with a soft-start at time t

. The switching stresses on the power

MOSFET, diode and transformer are minimized during soft-start. The soft-start implemented in ICE5xRxxxxAG is

a digital time-based function. The preset soft-start time is t

(12 ms) with 4 steps. If not limited by other

functions, the peak voltage on CS pin will increase step by step from 0.3 V to V

CS_N

(0.8 V) finally. The normal

feedback loop will take over the control when the output voltage reaches its regulated value.

Figure 6 Maximum current sense voltage during soft start

3.3 Normal operation

The PWM controller during normal operation consists of a digital signal processing circuit including regulation

control and an analog circuit including a current measurement unit and a comparator. Details about the full

operation of the CoolSET™ in normal operation are illustrated in the following paragraphs.

3.3.1 PWM operation and peak current mode control

3.3.1.1 Switch-on determination

The power MOSFET turn-on is synchronized with the internal oscillator with a switching frequency f

that

corresponds to the voltage level V

(see Figure 8).

3.3.1.2 Switch-off determination

In peak current mode control, the PWM comparator monitors voltage V

(see Figure 4) which is the

representation of the instantaneous current of the power MOSFET. When V

exceeds V

, the PWM comparator

sends a signal to switch off the GATE of the power MOSFET. Therefore, the peak current of the power MOSFET is

controlled by the feedback voltage V

(see Figure 7).

At switch on transient of the power MOSFET, a voltage spike across R

can cause V

to increase and exceed V

To avoid a false switch off, the IC has a blanking time t

CS_LEB

before detecting the voltage across R

to mask the

voltage spike. Therefore, the minimum turn on time of the power MOSFET is t

CS_LEB

For some reason that the voltage level at V

takes long time to exceed V

, the IC has implemented a maximum

duty cycle control to force the power MOSFET to switch off when D

MAX

= 0.75 is reached.

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