HA17384SPS Datasheet, PDF (8/29 Pages) Hitachi Semiconductor – High Speed Current Mode PWM Control IC for Switching Power Supply

HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Electrical Characteristics (cont.)
• Current Sensing Part
(The condition is: Ta = 25°C, V_IN = 15 V, C_T = 3300 pF, R_T = 10 kΩ without notice)
Item
Symbol Min Typ Max Unit
Test Condition
Note
Voltage gain
A_VCS
2.85 3.00 3.15
V/V V_FB = 0 V
1
Maximum sensing voltage Vth_CS
0.9
1.0
1.1
V
Power supply voltage
PSRR
–
70
–
dB 12 V ≤ V_IN ≤ 25 V
2
rejection ratio
Input bias current
I_BCS
–
–2
–10
µA V_CS = 2 V
Current sensing
response time
tpd
50
100 150
ns Time from when V_CS becomes 3
2 V to when output becomes
“L” (2 V)
Notes: 1. The gain this case is the ratio of error amplifier output change to the current-sensing threshold voltage
change.
2. Reference value for design.
3. Current sensing response time tpd is definded a shown in the figure 1.
Vth
V_CS
V_OUT
(PWM)
tpd
Figure 1 Definition of Current Sensing Response Time tpd
• PWM Output Part
Item
Symbol
Output low voltage 1
V_OL1
Output low voltage 2
V_OL2
Output high voltage 1
V_OH1
Output high voltage 2
V_OH2
Output low voltage at
standby mode
V_{OL STB}
Rise time
t_r
Fall time
t_f
Maximum ON duty
Du max
Minimum ON duty
Du min
Note: 1. Pulse application test
Min Typ Max
–
0.7
1.5
–
1.5
2.2
13.0 13.5
–
12.0 13.3
–
–
0.8
1.1
–
80
150
–
70
130
94
96
100
–
–
0
Unit
Test Condition
V losink = 20 mA
V losink = 200 mA
V losource = –20 mA
V losource = –200 mA
V
V_IN = 5 V,
losink = 1 mA
ns C_L = 1000 pF
ns C_L = 1000 pF
%
%
Note
1
1
Rev.3.00 Jun 15, 2005 page 8 of 28