HA17384SPS Datasheet, PDF (20/29 Pages) Hitachi Semiconductor – High Speed Current Mode PWM Control IC for Switching Power Supply

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Oscillation Frequency vs. Ambient Temperature
65
V_IN = 15V
C_L = 1000pF
60
55
Dumax = 95%
C_T = 3300pF
R_T = 10kΩ
50
45
Dumax = 40%
C_T = 0.033µF
R_T = 680Ω
40
−20 0 20 40 60 80 105
Ambient Temperature Ta (°C)
Operating Current vs. Maximum ON Duty
25
V_IN = 15V
20
Ta=25°C
C_L = 1000pF
15
fosc=300kHz
V_CS = 0V
V_FB = 0V
10
fosc=50kHz
5
0
0
25
50
75
100
Maximum ON Duty Du max (%)
Rise/Fall Time of Output Pulse vs. Load Capacitance
250
V_IN = 15V
V_CS = 0V
200 V_FB = 0V
Ta = 25°C
C_T = 3300pF
R_T = 10kΩ
150
100
Rise ^{time tr}
Fall ^{Time tf}
50
Rise/Fall Time of Output Pulse vs. Ambient Temperature
250
V_IN = 15V
V_CS = 0V
200 V_FB = 0V
C_L = 1000pF
C_T = 3300pF
150
R_T = 10kΩ
100
Rise time t_r
50
Fall Time t_f
0
0
1000 2000 3000 4000
Output load capacitance C_L (pF)
Current Sensing Level vs. Ambient Temperature
1.25
V_IN = 15V Measured when COMP terminal
1.00 ^{VFB = 0V voltage is externally supplied}
0.75
0.50
0.25
0
−20 0 20 40 60 80 105
Ambient temperature Ta (°C)
0
−20 0 20 40 60 80 105
Ambient temperature Ta (°C)
Relationship Between Low Voltage Malfunction
Protection and PWM Output
V_IN
(UVL1)
L
H
H
L
Vref
(UVL2)
L
L
H
H
PWM
L
OUTPUT
Available
L to
L
output
Condition
description
Standby
state
IC is in
the ON
state and ^Operation
output is ^state
fixed to
LO.
Standby
state
Rev.3.00 Jun 15, 2005 page 20 of 28