HA17385HRP 查看數據表（PDF） - Hitachi -> Renesas Electronics

零件编号

产品描述 (功能)

生产厂家

HA17385HRP

High Speed Current Mode PWM Control IC for Switching Power Supply

Hitachi -> Renesas Electronics 

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP

500

Ta = 25¡C

VIN = 15V

200

C

100

50

20

0.047µ0F.022µ0.F014µ7F0202p0F01p0F00pTF= 470pF

10

5

500 1k

2k 5k 10k 20k 50k 100k 200k

Timing resistance RT (Ω)

Figure 7 Oscillation Frequency vs. Timing Resistance

Case 1.

Setting large maximum duty cycle.

Triangular wave

PWM maximum ON pulse

Case 2.

Setting small maximum duty cycle.

Du max = 95%

fosc = 52kHz

In the case of small CT and large RT

(ex. CT = 3300pF, RT = 10kΩ)

Triangular wave

PWM maximum ON pulse

Du max = 40%

fosc = 52kHz

In the case of large CT and small RT

(ex. CT = 0.033µF, RT = 680Ω)

Figure 8 Relationship Between Triangular Wave and Maximum ON Duty of PWM Pulse

19

Share Link: