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- 1 Results for a part that might be similar to «qh7937»: QH130Note: This part list is based upon the part number. Please verify all specifications of the parts below.
- 2 QH7938 Datasheet Download — ETC
- 3 HT7937 Datasheet Download — Holtek Semiconductor
- 4 Results for a part that might be similar to «qh7938»: QH-3/8Note: This part list is based upon the part number. Please verify all specifications of the parts below.
Results for a part that might be similar to «qh7937»: QH130Note: This part list is based upon the part number. Please verify all specifications of the parts below.
Quest Components
Part # | Manufacturer | Description | Stock | Price | Buy |
---|---|---|---|---|---|
QH130 |
Square D by Schneider Electric |
PLUG-ON CIRCUIT BREAKER, 30A, 120/240 V, 50-60 HZ |
1 |
Newark element14 Authorized Distributor
Part # | Manufacturer | Description | Stock | Price | Buy |
---|---|---|---|---|---|
QH130 DISTI # |
Square D by Schneider Electric |
MINIATURE CIRCUIT BREAKER 120/240V 30A RoHS: Not Compliant
Min Qty:
Container: |
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QH7938 Datasheet Download — ETC
Номер произв | QH7938 | |||
Описание | Primary side feedback dimmable single-stage active PFC LED constant current control chip | |||
Производители | ETC | |||
логотип | ||||
1Page
QH7938 可调光原边反馈单级有源 PFC LED 恒流控制芯片 概述 QH7938是一款单级、带有源功率因数校正的高精度 原边反馈 LED 恒流控制芯片,带调光控制功能,适 用于 85Vac-265Vac 全范围输入电压的反激式隔离 或升降压型非隔离 LED 恒流电源。QH7938集成有源 功率因数校正电路,可以实现很高的功率因数和很 式,功率 MOS 管处于零电流开通状态,开关损耗得 以减小,同时变压器的利用率也较高。 QH7938 采用专有的电流采样机制,工作于原边反馈 模式,无需次级反馈电路,即可实现高精度输出恒 QH7938 采用专利的线电压和负载补偿技术,可以达 到优异的线电压调整率和负载调整率。线电压补偿 LED 开路保护、LED 短路保护、芯片供电过压保护、 欠压保护、电流采样电阻开路保护和逐周期限流等。 所有的保护都具有自动重启功能。另外,QH7938具 有过热调节功能,在驱动电源过热时减小输出电流, 以提高系统的可靠性。QH7938的过热调节温度可以 通过外部电阻设定。 单级、有源功率因数校正,高 PF 值,低 THD 原边反馈恒流控制,无需次级反馈电路 带调光接口 ±3% LED 输出电流精度 优异的线电压调整率和负载调整率 电感电流临界连续模式 超低 (28uA) 启动电流 FB 反馈电阻值高,功耗低 LED 开路短路保护 电流采样电阻开路保护 逐周期原边电流限流 芯片供电过压欠压保护 自动重启功能 过热调节功能 过热调节温度可外部设定 采用 SOP-8 封装 应用 GU10/E27 LED 球泡灯、射灯 LED PAR30、PAR38 灯 LED 日光灯 其它 LED 照明 典型应用 NP NS AC NA QH7938 2 VCC RTH 8 3 FB DIM 7 1 COMP 6 GND GATE 5 CS 4 图 1 QH7938 典型应用图 1
定购信息 QQqH7938 QH7938 可调光原边反馈单级有源 PFC LED 恒流控制芯片 封装 -40 ℃ 到 105 ℃ 包装形式 2,500 颗盘 打印 VCC QH7938 DIM FB GND 图 2 管脚封装图 XXXXXY: lot code YY:Week 管脚名称 外部功率 MOS 管栅极驱动 芯片信号和功率地
可调光原边反馈单级有源 PFC LED 恒流控制芯片 极限参数(注 1) 符号 VCC 电源电压 -0.3~25 单位 ICC_MAX VCC引脚最大钳位电流 5 mA COMP 环路补偿点 -0.3~6 V FB 辅助绕组的反馈端 -0.3~6 V CS 电流采样端 -0.3~6 V DIM 调光输入端 -0.3~6 V RTH 过热调节温度调整端 -0.3~6 V GATE 外部功率 MOS 管栅极驱动电压 -0.3~25 V PDMAX 功耗(注 2) 0.45 θ JA PN 结到环境的热阻 145 ℃/W TJ 工作结温范围 -40 to 150 TSTG 储存温度范围 -55 to 150 ESD (注 3) 2 KV 注 1:最大极限值是指超出该工作范围,芯片有可能损坏。推荐工作范围是指在该范围内,器件功能正常,但并不完全 保证满足个别性能指标。电气参数定义了器件在工作范围内并且在保证特定性能指标的测试条件下的直流和交流电参数 注 2:温度升高最大功耗一定会减小,这也是由 TJMAX, θ JA,和环境温度 TA 所决定的。最大允许功耗为 PDMAX = (TJMAX — TA)/ θ JA 或是极限范围给出的数字中比较低的那个值。 注 3:人体模型,100pF 电容通过 1.5KΩ 电阻放电。 推荐工作范围 VCC 参数 8.5 ~ 17 单位 |
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Всего страниц | 9 Pages | |||
Скачать PDF |
HT7937 Datasheet Download — Holtek Semiconductor
Номер произв | HT7937 | |||
Описание | Built-in OVP White LED Step-up Converter | |||
Производители | Holtek Semiconductor | |||
логотип | ||||
1Page
HT7937 · Integrated open-circuit protection · Over voltage protection · Up to 84% efficiency at VIN=3V, 3LEDs, ILED= 20mA · 1.2MHz fixed switching frequency · Low standby current: 0.1mA (typ.) (VSHDN=0V) · Matches LED current · Small value inductor and capacitors · Small outline SOT23-6 package Applications · Cellular phones · PDAs · DSCs · Handheld devices · White LED display backlighting General Description across an external sense resistor, RFB connected be- tween the FB pin and ground. The integrated open load
HT7937 Maximum Junction Temperature……………………..125°C SW Voltage……………………………………………………..36V Operating Temperature Range ……………-40°C to 85°C Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed
HT7937 VSHDN=3V; VIN=3V; Ta=25°C (Unless otherwise specified)(Note) Symbol VIN Input Voltage IIN Supply Current VFB fOSC DC RDS(ON) ISW(OFF) VIH VIL VOVP Feedback Voltage VSHDN= 0V 3 LEDs ¾ 1.0 1.25 mA ¾ 50 100 mA ¾ 0.1 1 mA 85 95 105 mV 85 90 ¾ % ¾ 1.4 5 ¾ 0.1 1 mA 1.5 ¾ ¾ V ¾ ¾ 0.3 V 23 28 33 Note: Specifications are production tested at Ta=25 degree. Specifications over -40 to 85 degree operating temperature range are assured by design, characterization. |
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Всего страниц | 13 Pages | |||
Скачать PDF |
Results for a part that might be similar to «qh7938»: QH-3/8Note: This part list is based upon the part number. Please verify all specifications of the parts below.
Farnell element14 Authorized Distributor
Part # | Manufacturer | Description | Stock | Price | Buy |
---|---|---|---|---|---|
QH-3/8 DISTI # |
Festo |
BALL VALVE, G3/8, 180DEG C RoHS: Compliant
Min Qty:
Container: |
2 |
Newark element14 Authorized Distributor
Part # | Manufacturer | Description | Stock | Price | Buy |
---|---|---|---|---|---|
QH-3/8 DISTI # |
Festo |
BALL VALVE, G3/8, 180DEG C ROHS COMPLIANT: YES RoHS: Compliant
Min Qty:
Container: |
2 |
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