參數(shù)資料
型號: HA17384HRP
廠商: Hitachi,Ltd.
元件分類: 基準電壓源/電流源
英文描述: High Speed Current Mode PWM Control IC for Switching Power Supply
中文描述: 高速開關(guān)電源電流模式PWM控制IC
文件頁數(shù): 19/31頁
文件大小: 145K
代理商: HA17384HRP
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
19
O
Timing resistance R
T
(
)
500
200
100
50
20
10
5
500
1k
2k
5k
10k
20k
50k 100k 200k
Ta = 25C
V
IN
= 15V
2200pF
4700pF
001
μ
F
0022
μ
F
0047
μ
F
1000pF
C
T
=470pF
Figure 7 Oscillation Frequency vs. Timing Resistance
Triangular wave
PWM maximum ON pulse
In the case of small C
T
and large R
T
(ex. C
T
= 3300pF, R
T
= 10k
)
Du max = 95%
fosc = 52kHz
Triangular wave
PWM maximum ON pulse
In the case of large C
T
and small R
T
(ex. C
T
= 0.033
μ
F, R
T
= 680
)
Du max = 40%
fosc = 52kHz
Case 1.
Setting large maximum duty cycle.
Case 2.
Setting small maximum duty cycle.
Figure 8 Relationship Between Triangular Wave and Maximum ON Duty of PWM Pulse
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